CN107483338A - A kind of method, apparatus and system for determining cross-domain label switched path tunnel - Google Patents

A kind of method, apparatus and system for determining cross-domain label switched path tunnel Download PDF

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Publication number
CN107483338A
CN107483338A CN201610402567.0A CN201610402567A CN107483338A CN 107483338 A CN107483338 A CN 107483338A CN 201610402567 A CN201610402567 A CN 201610402567A CN 107483338 A CN107483338 A CN 107483338A
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China
Prior art keywords
tunnel
node
controller
cross
label
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CN201610402567.0A
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Chinese (zh)
Inventor
王海波
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CN201610402567.0A priority Critical patent/CN107483338A/en
Priority to PCT/CN2017/084377 priority patent/WO2017211164A1/en
Publication of CN107483338A publication Critical patent/CN107483338A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46—Interconnection of networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/50—Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46—Interconnection of networks
    • H04L12/4633—Interconnection of networks using encapsulation techniques, e.g. tunneling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control

Abstract

The present invention provides a kind of method, apparatus and system for determining cross-domain label switched path tunnel, and this method includes：The tunnel building request of the lsp tunnel for asking to establish between first node and tail node is obtained, first node belongs to different domains from tail node；First cross-domain lsp tunnel is calculated based on network topology, the node that first cross-domain lsp tunnel passes through includes first node, intermediate node and tail node, including first node and section point between there is the tunnel that has built up, network topology includes the tunnel having built up；Corresponding tunnel configuration message is issued to each node, for indicating to establish the first cross-domain lsp tunnel, wherein, controller carries next-hop tunnel information to the tunnel configuration message that first node is sent, and next-hop tunnel information is used to indicate the tunnel having built up.The present invention can be born with establishing cross-domain lsp tunnel on the basis of signaling consumption on the calculation road for effectively reducing controller.

Description

A kind of method, apparatus and system for determining cross-domain label switched path tunnel
Technical field
Cross-domain label switched path tunnel is determined the present embodiments relate to the communications field, and more particularly, to one kind The method, apparatus and system in road.
Background technology
For the scene across autonomous system (autonomous system, AS) domain, cross-domain end-to-end (End is completed To End, E2E) business lay, it is necessary to cross-domain label switched path end to end (Label Switched Path, LSP) tunnel., it is necessary to which controller calculates cross-domain lsp tunnel node by node in the existing scheme for establishing cross-domain LSP, accordingly, Each node into tunnel is needed to issue corresponding tunnel configuration, to establish the cross-domain lsp tunnel.
In the existing scheme for establishing cross-domain lsp tunnel, controller calculation road burden is larger, and signaling consumption is also larger.
The content of the invention
The present invention provides a kind of method, apparatus and system for determining cross-domain lsp tunnel, can effectively reduce controller Road burden is calculated with establishing cross-domain lsp tunnel on the basis of signaling consumption.
First aspect, there is provided a kind of method for determining cross-domain label switched path tunnel, this method include：
Controller obtains tunnel building request, and the tunnel building asks to establish between first node and tail node for request Label switching path LSP tunnel, the first node belongs to different domains from the tail node；The controller is according to the tunnel Request is established in road, calculates the first cross-domain lsp tunnel based on network topology, the node that the first cross-domain lsp tunnel passes through includes The first node, the first intermediate node and the tail node, wherein, the first node, first intermediate node and the tail There is the tunnel having built up, the network topology includes described built between first node and section point in node Vertical tunnel；The controller issues corresponding tunnel to the first node, first intermediate node with the tail node respectively Road configures message, for indicating that the first node, first intermediate node and the tail node establish the described first cross-domain LSP Tunnel, wherein, the controller carries next-hop tunnel information to the tunnel configuration message that the first node is sent, under described One jump tunnel information is used to indicate the tunnel having built up, to indicate the tunnel being had built up described in the first node utilization Road is communicatively coupled with the section point.
It should be understood that first intermediate node can include one or more nodes, it is in other words, cross-domain described first One or more intermediate nodes can be included between the first node and tail node of lsp tunnel.
It should also be understood that in technical solution of the present invention, the first node belongs to different domains from the tail node, specifically Ground, such as the first node belong to different AS domains from the tail node, or the first node belongs to phase with the tail node With the different IGP domains in AS domains.
In technical solution of the present invention, the first node can indicate the first node of the described first cross-domain lsp tunnel, or Person indicates the first intermediate node of the first cross-domain lsp tunnel, or the instruction first node and first intermediate node.
In technical solution of the present invention, controller is based on network topology and calculates cross-domain lsp tunnel, is wrapped in the network topology The tunnel having had built up is included, then controller can calculate cross-domain lsp tunnel based on the tunnel having been had built up in network.Specifically Ground, controller know that the cross-domain lsp tunnel to be calculated passes through first node and section point, and first segment according to network topology There is the tunnel that has built up, then the tunnel that controller is directly had built up using this determines described the between point and section point Tunnel between one node and section point, rather than the tunnel between first node and section point is calculated node by node.It should be understood that The computation burden in the tunnel between first node and section point is reduced, it is cross-domain that controller calculating whole piece can be reduced naturally The computation burden of lsp tunnel.After the controller completes the calculating of cross-domain lsp tunnel, turned by what is passed through to cross-domain lsp tunnel Hair node issues corresponding tunnel configuration message, to complete the foundation of cross-domain lsp tunnel, wherein in the tunnel sent to first node Next-hop tunnel information is carried in road configuration message, the next-hop tunnel information is used to indicate the tunnel having built up, with instruction First node is established with section point using the tunnel having built up and communicated to connect, rather than is needed as prior art to first Each forward node between node and section point, which issues corresponding tunnel configuration message, can just realize first node and Communication connection between two nodes, therefore, it is possible to reduce the signaling consumption of controller.
In summary, in technical solution of the present invention, controller is calculated cross-domain using the tunnel having been had built up in network Lsp tunnel, it can effectively reduce the calculation road burden of controller.Controller in tunnel configuration message by carrying next-hop tunnel Information, each node without passing through to cross-domain lsp tunnel issue tunnel configuration, can reduce controller to a certain extent Signaling consumption.Compared to prior art, technical solution of the present invention can be born on the calculation road for effectively reducing controller and signaling On the basis of expense, the foundation of cross-domain lsp tunnel is completed.
It should be understood that in technical solution of the present invention, except including the first node, institute in the network topology that controller is known State the institute having between the relevant information of the first intermediate node and the tail node, in addition to the first node and section point State the relevant information in the tunnel having built up.In other words, controller can know cross-domain lsp tunnel warp according to network topology First node and section point are crossed, and there is the tunnel having built up having had built up between first node and section point.
It should also be understood that in technical solution of the present invention, controller can be used described in existing any feasible method acquisition Network topology.
In technical solution of the present invention, the tunnel having built up refers to the tunnel having been had built up in network, specifically, The tunnel having built up includes but is not limited to following any tunnel：The communication network such as LDP LSP, BGP LSP, TE, GRE The tunnel used in network.Wherein, LDP is tag distribution protocol (Label Distribution Protocol), and TE is flow work Journey (Traffic Engineering), BGP are Border Gateway Protocol (Border Gateway Protocol), and GRE is general Routed encapsulation (Generic Routing Encapsulation).
With reference in a first aspect, in the first possible implementation of first aspect, described in the first node instruction The first node that cross-domain lsp tunnel passes through and first intermediate node.
It should be understood that in technical solution of the present invention, controller is known according to network topology, has been built by splicing in network The tunnel stood, and cross-domain lsp tunnel is calculated, it can further reduce the calculation road burden of controller.
With reference to the possible implementation of the first of first aspect or first aspect, second in first aspect is possible In implementation, the controller issues corresponding to the first node, first intermediate node with the tail node respectively Tunnel configuration message, including：The controller sends the first tunnel configuration message, first tunnel configuration to the first node Message carries following message：Entrance tunnels type (Ingress), outgoing label, the IP address of next-hop node；The controller to First intermediate node sends the second tunnel configuration message, and the second tunnel configuration message carries following message：Transfer tunnel Road type (Transit), the IP address for entering label, outgoing label, next-hop node, first intermediate node enter label and institute The outgoing label for stating the upper hop node of the first intermediate node is identical；The controller sends the 3rd tunnel configuration to the tail node Message, the 3rd tunnel configuration message carry following message：Exit tunnel type (Egress), enter label, the tail node To enter label identical with the outgoing label of the upper hop node of the tail node.
With reference to the first or second of possible implementation of first aspect or first aspect, the 3rd of first aspect the Plant in possible implementation, the next-hop tunnel carried in the tunnel configuration message that the controller is sent to the first node Road information includes being used to indicate the tunnel name in tunnel and/or the tunnel type in the tunnel having built up having built up Information.
It is possible to any of the third possible implementation with reference to the first of first aspect or first aspect Implementation, in the 4th kind of possible implementation of first aspect, the controller utilizes network configuration NETCONF agreements Or Border Gateway Protocol (BGP) issued respectively to the first node, first intermediate node with the tail node it is corresponding Tunnel configuration message.
It is possible with reference to any of the first of first aspect or first aspect to the 4th kind of possible implementation Implementation, in the 5th kind of possible implementation of first aspect, the controller is respectively to the first node, described The tunnel name of the described first cross-domain lsp tunnel is also carried in the tunnel configuration message that one intermediate node issues with the tail node, Methods described also includes：The controller is asked according to the tunnel building, and the second cross-domain LSP is calculated based on the network topology Tunnel, the node that the second cross-domain lsp tunnel passes through include the first node, the second intermediate node and the tail node；Institute State controller and send the carrying second cross-domain lsp tunnel to the first node, second intermediate node and the tail node Tunnel name tunnel configuration message, for indicating that the first node, second intermediate node and the tail node establish institute State the second cross-domain lsp tunnel.
It should be understood that the second cross-domain lsp tunnel and first lsp tunnel are not same lsp tunnels, in other words Say, the node that this two lsp tunnels are passed through is incomplete same.First intermediate node represents the first cross-domain lsp tunnel Each intermediate node (other nodes in addition to first node and tail node), second intermediate node represent that second is cross-domain Each intermediate node (other nodes in addition to first node and tail node) of lsp tunnel, then first intermediate node with Mutually different node is there will necessarily be in second intermediate node.
In technical solution of the present invention, controller is by setting tunnel name, between the first node and the tail node Two different cross-domain lsp tunnels are determined, can realize it is end-to-end between multi-path transmission.
It should be understood that controller is also based on the first node and tail node, more a plurality of cross-domain lsp tunnel is calculated, And different tunnel names is respectively configured, by sending corresponding tunnel configuration message to the node of correlation, to cause based on identical First node and tail node, establish a plurality of cross-domain lsp tunnel.
Second aspect, there is provided a kind of method for determining cross-domain label switched path tunnel, this method include：
First network equipment receives the tunnel for being used to indicate to establish cross-domain label switched path lsp tunnel that controller is sent Configure message, the tunnel configuration message carries next-hop tunnel information, and the next-hop tunnel information is used to indicating described the The tunnel having built up having between one network equipment and second network equipment, the cross-domain lsp tunnel include it is described The tunnel of foundation；The first network equipment according to the tunnel configuration message, by the tunnel having built up with it is described Second network equipment establishes communication connection.
In technical solution of the present invention, cross-domain lsp tunnel is established by the tunnel being had built up in network, can be effective Reduce controller and calculate the burden on road, while can also reduce the expense that signaling is transmitted between controller and the network equipment.
With reference to second aspect, in the first possible implementation of second aspect, the first network equipment is institute The first node of cross-domain lsp tunnel is stated, the tunnel configuration message that the first network equipment receives also carries following message：Enter Mouth tunnel type, outgoing label, the IP address of next-hop node, the next-hop node is second network equipment；It is or described First network equipment is the intermediate node of the cross-domain lsp tunnel, and the tunnel configuration that the first network equipment receives disappears Breath also carries following message：Transfer tunnel type, the IP address for entering label, outgoing label, next-hop node, the next-hop node For second network equipment, the first network equipment enters going out for label and the upper hop node of the first network equipment Label is identical.
It should be understood that when the first network equipment is the first node of the cross-domain lsp tunnel, second network equipment For the intermediate node of the cross-domain lsp tunnel.When the first network equipment is the intermediate node of the cross-domain lsp tunnel, Second network equipment is the next-hop intermediate node of first network equipment described in the cross-domain lsp tunnel, or described Second network equipment is the tail node of the cross-domain lsp tunnel.
It should also be understood that in the intermediate node that the first network equipment is the cross-domain lsp tunnel, second network is set In the case of the standby tail node for the cross-domain lsp tunnel, second network equipment receive tunnel configuration message include with Lower information：Exit tunnel type, enter label, the outgoing label for entering label and the first network equipment of second network equipment It is identical.
In the technical scheme that second aspect provides, the tunnel that the first network equipment issues according to the controller is matched somebody with somebody After putting message, according to next-hop tunnel information, it is determined that the tunnel having built up, and be the tunnel distributing tunnel having built up ID, and generate forwarding-table item.Specifically, when the first network equipment is the first node of cross-domain lsp tunnel, the forward table Item includes tunnel purpose IP address, outgoing label, the IP address of next-hop node, next-hop tunnel ID.When the first network Equipment be cross-domain lsp tunnel intermediate node when, the forwarding-table item include tunnel purpose IP address, enter label, outgoing label, The IP address of next-hop node, next-hop tunnel ID.When the first network equipment is the tail node of cross-domain lsp tunnel, institute Stating forwarding-table item includes tunnel purpose IP address and enters label.
The third aspect, there is provided a kind of method for determining cross-domain lsp tunnel, methods described include：
Controller obtains tunnel building request, and the tunnel building asks to establish the first end node and the second end for request Label switching path LSP tunnel between node, first end node belong to the first autonomous system, the second end node category In the second autonomous system, the first domain controller manages first autonomous system, and the second domain controller management described second is autonomous System；
The controller is asked according to the tunnel building, it is determined that needing the network topology by first autonomous system The first cross-domain lsp tunnel is calculated with the network topology of second autonomous system, the first node of the first cross-domain lsp tunnel is First end node, tail node are second end node；
The controller sends the first instruction message to first domain controller, and the first instruction message is used to indicate Lsp tunnel in the first domain between first end node and the first boundary node of first autonomous system is established, it is described First instruction message also indicates that node headed by first end node, first boundary node are intermediate node, described first The next-hop node of boundary node is the second boundary node of second autonomous system, and the first instruction message is additionally operable to refer to Show the outgoing label of first boundary node；
The controller sends the second instruction message to second domain controller, and the second instruction message is used to indicate Lsp tunnel in the second domain between second end node and the second boundary node is established, the second instruction message is also Indicate second end node be tail node, the second boundary node be intermediate node, it is described second instruction message be additionally operable to Indicate the label that enters of the second boundary node, the bid for entering label and first boundary node of the second boundary node Sign identical.
In technical solution of the present invention, in controller hierarchical scene, the controller is by controlling domain controller to establish Cross-domain lsp tunnel, it can also reduce controller and calculate road burden and signaling consumption.
In the method that the third aspect provides, the first domain controller or the second domain controller can be according to institutes in first aspect The method for stating controller establishes lsp tunnel.
In each implementation of the present invention, controller can issue tunnel configuration message, base using bgp protocol to node It can be referred to as BGP signalings in the tunnel configuration message of bgp protocol.BGP signalings in the present invention relative to traditional BGP signalings, Multiprotocol network layer up to information (Multi-Protocol Network Layer Reachability Information, MP-NLRI an address family) is increased in attribute, the address family is for example properly termed as tunnel routing address race, and the address family includes The information that following field and each field are used to store is as follows：Tunnel file-name field, for storing lsp tunnel to be established Tunnel name, the length of the tunnel file-name field is, for example, 2 bytes.It should be understood that the entitled character string in the tunnel, specifically, tunnel name Specific form can customize.Length of tunnel field, for the length of the tunnel name stored in storage tunneling file-name field, tunnel length The length for spending field is, for example, 1 byte.Destination address field (DAF), for storing the destination address of lsp tunnel to be established, the destination The form of expression of location is address family+destination address, and address family includes IPv4 and IPv6, and the length of the destination address field (DAF) is, for example, 3 bytes.Address length field, the total length of the tunnel destination address stored for storage purposes in address field, such as work as tunnel When road destination address is IPv4 addresses, address size is 4 bytes, when tunnel destination address is IPv6 addresses, address size one As be 16 bytes, the length of the address length field is, for example, 1 byte.Address mask field, for storage purposes address field The mask of the tunnel destination address of middle storage, the length of the address mask field is, for example, 1 byte.Tunnel type field, is used for The tunnel type of the receiving node of current tunnel configuration message is stored, tunnel type includes Ingress, Transit or Egress, The length of the tunnel type field is, for example, 1 byte.Tunnel label field, when the tunnel type in tunnel type field is During Ingress, the tunnel label stored in tunnel label field is outgoing label, when the tunnel type in tunnel type field is During Transit or Egress, the tunnel label stored in tunnel label field is the length example of the tunnel label field into label Such as it is 3 bytes.Tunnel switching label field, the only tunnel type in tunnel type field are effective when being Transit, work as tunnel When type is other situations, the tunnel switching label field is invalid, such as could be arranged to null value, the tunnel switching label field Length be, for example, 3 bytes.The next hop field in tunnel, the next-hop section of the receiving node for storing current tunnel configuration message The IP address of point, for example, IPv4 or IPv6, the length of the next hop field in the tunnel is, for example, 4 bytes.Next-hop tunnel type Field, the tunnel type in existing tunnel between the receiving node and next-hop node of message is configured for storing current tunnel. Specifically, for example, the next-hop tunnel type can be LDP LSP, BGP LSP, TE or GRE etc., the next-hop tunnel type The length of field is, for example, 1 byte.Tunnel Identifier field, for storing the tunnel type stored in next-hop tunnel type field Corresponding tunnel name, the length of the Tunnel Identifier field is, for example, 3 bytes.Tunnel Identifier length field, for storage tunneling mark The length of the tunnel name stored in character learning section, the length of the Tunnel Identifier length field is, for example, 1 byte.
Alternatively, the tunnel route field of the tunnel configuration message also includes following field：Reverse tunnel associates Field, the information for indicating reverse correlation tunnel is stored, only in multi-layer controller scene, the reverse tunnel associate field has Effect, instructs subordinate controllers reverse correlation tunnel, specifically, the reverse tunnel associate field specifically includes for higher controller Reverse tunnel file-name field, the length of the reverse tunnel file-name field are, for example, 2 bytes, reverse tunnel length field, the reverse tunnel The length of length field is, for example, 1 byte, reverse tunnel address length field, the length example of the reverse tunnel address length field Such as it is 1 byte, reverse tunnel address mask field, the length of the reverse tunnel address mask field is, for example, 1 byte, reverse tunnel Road destination address field (DAF), the length of the reverse tunnel destination address field (DAF) is, for example, 3 bytes.
The meaning of reverse tunnel associate field is set to be：Tunnel is typically uni-directional, i.e., a tunnel has unique one Individual destination address, but business is usually two-way, and the business on each direction needs to bind the tunnel of the direction, then two sides Upward business uses different tunnels.If the tunnel of both direction does not have incidence relation, it is possible that scenario described below：Side It is invalid (Down) to A tunnel, and direction B (direction A opposite direction) tunnel or effectively (Up), such case is being divided It is undesirable in layer controller scene.In the present invention, by setting reverse tunnel to associate in tunnel configuration message Field, to realize deployment bi-directional association tunnel, i.e., the tunnel-associated on the two directions of A, B is got up so that if a side To the tunnel on (such as direction A) it is invalid if, it is invalid that the tunnel on another direction (such as direction B) is also configured as.
In order to make it easy to understand, illustrate the effect of next-hop tunnel type field with specific example below.For example, next-hop tunnel The tunnel type of road type field storage is LDP LSP, after a node receives the tunnel configuration message that controller issues, root According in the tunnel configuration message next-hop tunnel type field carry LDP LSP, the node can utilize with next-hop node it Between the LDP lsp tunnels that have establish and communicate with next-hop node and (such as utilize LDP lsp tunnel down hops node forwarding Business Stream).It should be understood that under this situation, it is current to be established equivalent to being established using the LDP lsp tunnels having built up Lsp tunnel, this process are also referred to as Tunnel iteration (currently lsp tunnel iteration LDP lsp tunnels to be established).
In each implementation of the present invention, controller can also utilize network configuration (NETCONF) agreement under node Tunnel configuration message is sent out, the form of the tunnel configuration message based on NETCONF agreements can be the reticle of NETCONF agreements Formula, such as xsd tables.Specifically, also include in the tunnel configuration message based on NETCONF agreements as described above based on bgp protocol Each field that tunnel configuration message includes, in order to succinctly repeat no more.
Fourth aspect provides a kind of controller, and the controller is used for any for performing above-mentioned first aspect or first aspect Method in the possibility implementation of aspect.
Specifically, the controller can include being used for any possible implementation for performing first aspect or first aspect In method module.
5th aspect provides a kind of network equipment, and the network equipment is used to perform above-mentioned second aspect or second aspect Method in the possibility implementation of either side.
Specifically, the network equipment can include being used for any possible realization side for performing second aspect or second aspect The module of method in formula.
6th aspect provides a kind of controller, and the controller includes memory and processor, and the memory is used to store Instruction, the processor is used for the instruction for performing the memory storage, and the execution of the instruction to being stored in the memory causes Method in the possibility implementation of the either side of the computing device first aspect or first aspect.
7th aspect provides a kind of network equipment, and the network equipment includes memory and processor, and the memory is used for Store instruction, the processor are used for the instruction for performing the memory storage, and the execution of the instruction to being stored in the memory So that the method in the possibility implementation of the either side of the computing device second aspect or second aspect.
Eighth aspect, there is provided a kind of controller control system, the controller control system are included as fourth aspect carries The network equipment provided in terms of the controller of confession and the such as the 5th.
Based on above-mentioned technical proposal, in technical solution of the present invention, controller utilizes the tunnel having been had built up in network Cross-domain lsp tunnel is calculated, can effectively reduce the calculation road burden of controller.Under controller in tunnel configuration message by carrying One jumps tunnel information, and each node without passing through to cross-domain lsp tunnel issues tunnel configuration, can subtracted to a certain extent The signaling consumption of small controller.Compared to prior art, technical solution of the present invention can be born on the calculation road for effectively reducing controller Load is with the basis of signaling consumption, completing the foundation of cross-domain lsp tunnel.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be in embodiment or description of the prior art The required accompanying drawing used is briefly described, it should be apparent that, drawings in the following description are only some realities of the present invention Example is applied, for those of ordinary skill in the art, without having to pay creative labor, can also be attached according to these Figure obtains other accompanying drawings.
Fig. 1 shows the schematic diagram of a scenario of the embodiment of the present invention.
Fig. 2 shows the indicative flowchart of the method for the determination lsp tunnel provided according to embodiments of the present invention.
Fig. 3 shows the schematic diagram of the method for the determination lsp tunnel provided according to embodiments of the present invention.
Fig. 4 shows the schematic diagram of the form of the tunnel configuration message provided according to embodiments of the present invention.
Fig. 5 shows another schematic diagram of the method for the determination lsp tunnel provided according to embodiments of the present invention.
Fig. 6 shows the schematic block diagram of the controller provided according to embodiments of the present invention.
Fig. 7 shows the schematic block diagram of the forwarding unit provided according to embodiments of the present invention.
Fig. 8 shows another schematic block diagram of the controller provided according to embodiments of the present invention.
Fig. 9 shows another schematic block diagram of the forwarding unit provided according to embodiments of the present invention.
Figure 10 shows the schematic block diagram of the controller control system provided according to embodiments of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Site preparation describes, it is clear that described embodiment is part of the embodiment of the present invention, rather than whole embodiments.Based on this hair Embodiment in bright, the every other implementation that those of ordinary skill in the art are obtained under the premise of creative work is not made Example, belongs to the scope of protection of the invention.
The application scenarios of the embodiment of the present invention is establish cross-domain lsp tunnel, wherein the cross-domain LSP for referring to required foundation Two end nodes in tunnel belong to two different domains, such as belong to two different AS domains, or belong in identical AS domains Two different IGP domains.
In the existing scheme for establishing cross-domain lsp tunnel, the tunnel calculated in network, such as one can not be utilized Traffic engineering (TE) tunnel calculated in individual AS domains, cross-domain lsp tunnel is entirely to be calculated by controller, and Need controller to issue tunnel configuration to all nodes that cross-domain lsp tunnel passes through, cause controller calculation road pressure larger, signaling Expense is also larger.
For above-mentioned technical problem, the embodiment of the present invention provides a kind of method for determining cross-domain lsp tunnel, equipment and is System, the calculation road burden of controller can be effectively reduced with establishing cross-domain lsp tunnel on the basis of signaling consumption.
For the ease of understanding and describing the embodiment of the present invention, the application of the embodiment of the present invention is simply introduced with reference to Fig. 1 Scene.
Software defined network (Software Defined Network, SDN) is by by network device control plane and number Come according to planar separation, it is achieved thereby that the flexible control of network traffics.Specifically, as shown in figure 1, in control plane, SDN nets Network controller (SDN Network Controller, SNC) manages and control domain controller (Domain Controller, DC), DC is used to manage and the network equipment of control data plane, the network equipment base station side gateway as shown in Figure 1 of datum plane (Cell Site Gateway, CSG), convergence side gateway (Aggregation Site Gateway, ASG), autonomous system boundary Router (Autonomous System Boundary Router, ASBR).
The embodiment of the present invention can apply to the scene of the multi-layer controller (SNC and DC two layers) shown in Fig. 1；It can also answer For the scene of one layer of controller, such as there is no DC, only SNC scene in Fig. 1, in this scene, be uniformly controlled by SNC With each network equipment on management datum plane.In scene shown in Fig. 1, SNC is alternatively referred to as super controller.
Multiprotocol label switching (Multiprotocol Label Switching, MPLS) is a kind of classification transmission technology, Packet with identical forward process mode is classified as one kind, referred to as FEC (Forwarding Equivalence Class, turns Send out equivalence class).Identical FEC packet will obtain identical processing in an mpls network.FEC dividing mode is very clever It is living, can be that partitioning standards are used as using source address, destination address, source port, destination interface or protocol type etc..For example, passing In the IP forwardings using Longest prefix match algorithm of system, all messages to same destination address are exactly a FEC.Label is one Individual length fixes, only has the short identifier of local significance, and for the FEC belonging to one packet of unique mark, a label is only A FEC can be represented.LSR (Label Switching Router, LSR) is substantially first in MPLS network Element, all LSR support MPLS technology, for example, the network equipment CSG, ASG, ASBR shown in Fig. 1 can be used as LSR.One The path that FEC passes through in an mpls network is referred to as label switched path (Label Switched Path, LSP), such as in Fig. 1 Shown LSP<CSG1→ASG1→ASBR1→ASBR3→CSG2>.It is adjacent along the direction of data transmission on a LSP LSR is referred to as upstream LSR and downstream LSR, such as in Fig. 1, ASG1 is CSG1 downstream LSR, and CSG1 is ASG1 upstream LSR.LSP ingress is referred to as Ingress nodes, and middle node (also referred to as forward node) is referred to as Transit nodes, Egress is referred to as Egress nodes, such as in the LSP shown in Fig. 1, and CSG1 is Ingress nodes, ASG1, ASBR1 and ASBR3 It is Transit nodes, CSG2 is Egress nodes.
MPLS supports lsp tunnel technology.One LSP upstream LSR and downstream LSR, although the path between them may Not on the path that Routing Protocol is provided, but MPLS allows to establish a new LSP, so, upstream between them LSR and downstream LSR is exactly this LSP beginning and end respectively.At this moment, the LSP between upstream LSR and downstream LSR is exactly LSP tunnels Road, it is avoided using traditional Internet encapsulation tunnel.For example, the LSP shown in Fig. 1<CSG1→ASG1→ASBR1→ ASBR3→CSG2>A cross-domain lsp tunnel being considered as between CSG1 and CSG2.
Fig. 2 shows the indicative flowchart of the method 100 of the cross-domain lsp tunnel of the determination of the embodiment of the present invention, such as Fig. 2 institutes Show, this method 100 includes：
S110, controller obtain tunnel building request, and the tunnel building asks to establish first node and tail node for request Between label switching path LSP tunnel, the first node belongs to different domains from the tail node.Control in the embodiment of the present invention SNC of the device for example shown in Fig. 1.
S120, the controller are asked according to the tunnel building, calculate the first cross-domain lsp tunnel based on network topology, this The node that one cross-domain lsp tunnel passes through includes the first node, the first intermediate node and the tail node, wherein, the first node, this There is the tunnel having built up, in the network topology between one intermediate node and first node and section point in the tail node The tunnel being had built up including this.
It should be understood that first intermediate node instruction is located at the first node and the tail node in the first cross-domain lsp tunnel Middle one or more forward node.
S130, the controller issue corresponding tunnel with the tail node to the first node, first intermediate node respectively and matched somebody with somebody Message is put, for indicating that the first node, first intermediate node and the tail node establish the first cross-domain lsp tunnel, wherein, should Controller carries next-hop tunnel information to the tunnel configuration message that the first node is sent, and the next-hop tunnel information is used to refer to Show the tunnel having built up between first node and section point, to indicate tunnel that the first node is had built up using this It is communicatively coupled with the section point.The next-hop tunnel information specifically includes next-hop tunnel (the corresponding tunnel having built up Road) tunnel type.
Specifically, controller carries following message to the tunnel configuration message that first node is sent：Entrance tunnels type (Ingress), the IP address of outgoing label, next-hop node；The tunnel configuration message sent to the first intermediate node carries following Information：Transfer tunnel type (Transit), the IP address for entering label, outgoing label, next-hop node, first intermediate node It is identical with the outgoing label of the upper hop node of first intermediate node to enter label；The tunnel configuration message sent to the tail node is taken Band following message：Exit tunnel type (Egress), enter label, the upper hop node for entering label and the tail node of the tail node Outgoing label it is identical.
S140, the first node carry next-hop tunnel according to the tunnel configuration message received, the tunnel configuration message Information, the next-hop tunnel information are used for the tunnel having built up that indicates to have between first node and section point, and this One node is established with the section point by the tunnel that this has built up and communicated to connect.
When the first node is the first node of the first cross-domain lsp tunnel, the section point is the first cross-domain LSP tunnels The intermediate node in road.When the first node be the first cross-domain lsp tunnel intermediate node when, the section point for this first across The next-hop intermediate node of the first node in the lsp tunnel of domain, or the periproct that the section point is the first cross-domain lsp tunnel Point.
Specifically, when the first node is the first node of the first cross-domain lsp tunnel, the first node receives controller The tunnel configuration message of transmission also carries following message：Entrance tunnels type (Ingress), outgoing label, the IP of next-hop node Address, the next-hop node are section point.The first node is according to the next-hop tunnel in the tunnel configuration message of reception Information, it is determined that the tunnel having built up, and be the tunnel distributing tunnel ID that this has built up, and generate forwarding-table item.The forwarding List item includes tunnel purpose IP address, outgoing label, the IP address of next-hop node, next-hop tunnel ID and (as had built up Tunnel distributing ID).
Specifically, when the first node is the intermediate node of the first cross-domain lsp tunnel, the first node receives control The tunnel configuration message that device is sent also carries following message：Transfer tunnel type (Transit), enter label, outgoing label, next-hop The IP address of node, the next-hop node are the section point, and enter label and the first node upper the one of the first node The outgoing label of hop node is identical.Next-hop tunnel information of the first node in tunnel configuration message, it is determined that having built up Tunnel, and the tunnel distributing tunnel ID having built up for this, and generate forwarding-table item.The forwarding-table item includes tunnel purpose IP address, enter label, outgoing label, the IP address of next-hop node, next-hop tunnel ID (tunnel distributing as having built up ID)。
It should also be understood that in the intermediate node that the first node is the cross-domain lsp tunnel, the section point is the cross-domain LSP In the case of the tail node in tunnel, the section point, which receives the tunnel configuration message that controller is sent, includes following information：Outlet Tunnel type (Egress) and enter label, the section point to enter label identical with the outgoing label of the first node.Second section Point includes tunnel purpose IP address with entering mark according to the tunnel configuration message generation forwarding-table item received, the forwarding-table item Label.
Specifically, as shown in figure 3, controller obtain in advance network topology as shown in Figure 3 (including CSG1, ASG1, CSG3 and CSG2 relevant topology information).Assuming that LDP lsp tunnels have been had built up between CSG1 and CSG2, the LDP LSP tunnels Multiple forward node (not shown in Fig. 3) may be included on road, traffic engineering tunnel is had been set up between ASG1 and CSG2, the traffic engineering tunnel On may include multiple forward node (not shown in Fig. 3).LDP lsp tunnels between CSG1 and CSG2, and ASG1 with The tunnel having built up that traffic engineering tunnel between CSG2 corresponds in the embodiment of the present invention.
Controller is obtained for asking the tunnel building for establishing lsp tunnel between CSG1 and CSG2 to be asked.Controller root According to the network topology shown in Fig. 3, using CSG1 as first node, using CSG2 as tail node, a lsp tunnel is calculated：<CSG1→ ASG1→CSG2>(the first cross-domain lsp tunnel corresponded in the embodiment of the present invention).Then CSG1 is Ingress nodes, and ASG1 is Transit nodes, CSG2 are Egress nodes.Controller is respectively CSG1, ASG1, CSG2 distribution label：For Ingress nodes CSG1 distributes outgoing label Label1, is dispensed into label Label1 and outgoing label Label2 for Transit nodes ASG1, is Egress Node CSG2 is dispensed into label Label2.Then controller issues associated tunnel configuration message to CSG1, ASG1, CSG2 respectively, To create lsp tunnel<CSG1→ASG1→CSG2>.
Specifically, controller includes to the tunnel configuration message that CSG1 is issued：Entrance tunnels type (Ingress), bid Label1, the IP address of next-hop node (i.e. ASG1), and next-hop tunnel type LDP lsp tunnels are signed, for indicating CSG1 is established with ASG1 using the LDP lsp tunnels and communicated to connect；Include to the tunnel configuration message that ASG1 is issued：Transfer tunnel Type (Transit), enter label Label1, outgoing label Label2, the IP address of next-hop node (i.e. CSG2), and next-hop Tunnel type traffic engineering tunnel, communicated to connect for indicating that ASG1 is established using traffic engineering tunnel and CSG2, for example, ASG1 using traffic engineering tunnel to CSG2 forwarding service streams；Include to the tunnel configuration message that CSG2 is issued：Exit tunnel type (Egress), enters label Label2.So far, lsp tunnel is completed<CSG1→ASG1→CSG2>Foundation.The follow-up Business Stream into network can be according to< CSG1→ASG1→CSG2>It is transmitted.For example, the tunnel configuration message issued according to controller, CSG1 utilizes the LDP LSP Tunnel sends the Business Stream for carrying Label1 to ASG1, and ASG1 receives the Business Stream for carrying Label1, and industry is replaced using Label2 Label1 in business stream, and received using Business Stream from the traffic engineering tunnel to CSG2 transmission carryings Label2, CSG2 and carry Label2 Business Stream.
In embodiments of the present invention, cross-domain lsp tunnel by the tunnel configuration message that is issued according to controller of node after, According to next-hop tunnel information, it is determined that the tunnel having built up, and be the tunnel distributing tunnel ID that this has built up, and generate and turn Forwarding list item.Specifically, the tunnel configuration message that CSG1 issues according to controller generates forwarding-table item, and the forwarding-table item includes tunnel Road purpose IP address (i.e. CSG2 IP address), outgoing label Label1, the IP address of next-hop node (i.e. ASG1), next-hop tunnel Road (i.e. LDP lsp tunnels) ID.The tunnel configuration message that ASG1 is issued according to controller generates forwarding-table item, in the forwarding-table item Including tunnel purpose IP address (i.e. CSG2 IP address), enter label Label1, outgoing label Label2, next-hop node (i.e. CSG1 IP address), next-hop tunnel (i.e. traffic engineering tunnel) ID.The tunnel configuration message that CSG2 issues according to controller generates forwarding List item, the forwarding-table item include tunnel purpose IP address (i.e. CSG2 IP address), enter label Label2.
Alternatively, in embodiments of the present invention, controller can be lsp tunnel<CSG1→ASG1→CSG2>Distribute tunnel name Tunnel1 (being the entitled Tunnel1 in tunnel of the first cross-domain lsp tunnel configuration).
Specifically, tunnel can be carried in controller issues associated tunnel configuration message to CSG1, ASG1, CSG2 respectively Name Tunnel1.
In embodiments of the present invention, controller is based on network topology and calculates cross-domain lsp tunnel, and the network topology includes The tunnel having had built up, then controller can be based on the cross-domain lsp tunnel of tunnel calculating having been had built up in network.Specifically Ground, controller know that the cross-domain lsp tunnel to be calculated passes through first node and section point, and first segment according to network topology There is the tunnel having built up built up, the then tunnel that controller is directly had built up using this between point and section point The tunnel between the first node and section point is determined, rather than calculates the tunnel between first node and section point node by node Road.For example, in scene shown in Fig. 3, without calculating the specific tunnel from ASG1 to CSG2 (assuming that ASG1 and CSG2 and non-straight Even, other multiple forward node are also included before the two), ASG1 and CSG2 connection can be directly realized using traffic engineering tunnel.Should Understand, reduce the computation burden in the tunnel between first node and section point, controller can be reduced naturally and calculate whole piece The computation burden of cross-domain lsp tunnel.After the controller completes the calculating of cross-domain lsp tunnel, by passing through to cross-domain lsp tunnel Forward node issue corresponding tunnel configuration message, to complete the foundation of cross-domain lsp tunnel, wherein being sent to first node Tunnel configuration message in carry next-hop tunnel information, the next-hop tunnel information is used to indicate the tunnel that has built up, with Indicate that first node is established using the tunnel that has built up with section point to communicate to connect, rather than need as prior art to Each forward node between first node and section point, which issues corresponding tunnel configuration message, can just realize first node Communication connection between section point, therefore, it is possible to reduce the signaling consumption of controller.
In summary, in embodiments of the present invention, controller calculates cross-domain LSP using the tunnel having been had built up in network Tunnel, it can effectively reduce the calculation road burden of controller.Controller is believed by carrying next-hop tunnel in tunnel configuration message Breath, each node without passing through to cross-domain lsp tunnel issue tunnel configuration, can reduce controller to a certain extent Signaling consumption.Compared to prior art, the embodiment of the present invention can be born on the calculation road for effectively reducing controller and signaling consumption On the basis of, complete the foundation of cross-domain lsp tunnel.
It should be understood that Fig. 3 is non-limiting as example, such as the tunnel being had built up between ASG1 and CSG2 is except traffic engineering tunnel Outside, it can also be these following tunnel types：The tunnel used in the communication network such as LDP LSP, BGP LSP, TE, GRE.This Inventive embodiments are not construed as limiting to this.
Alternatively, in embodiments of the present invention, the S130 controllers are to the first node, first intermediate node and the periproct Point issues corresponding tunnel configuration message, including：The controller network configures NETCONF agreements or Border Gateway Protocol (BGP) point Corresponding tunnel configuration message is not issued to the first node, first intermediate node with the tail node.The tunnel configuration message is BGP signalings.
Specifically, in the embodiment of the present invention, controller can issue tunnel configuration message, base using bgp protocol to node It can be referred to as BGP signalings in the tunnel configuration message of bgp protocol.BGP signalings in the present invention relative to traditional BGP signalings, Increase an address family in multiprotocol network layer is up to information (MP-NLRI) attribute, the address family is for example properly termed as tunnel Routing address race, it is as follows that the address family includes the information that following field and each field are used to store：Tunnel file-name field, For storing the tunnel name of lsp tunnel to be established, the length of the tunnel file-name field is, for example, 2 bytes.It should be understood that the tunnel is entitled Character string, specifically, the specific form of tunnel name can customize.Length of tunnel field, for being stored in storage tunneling file-name field Tunnel name length, the length of the length of tunnel field is, for example, 1 byte.Destination address field (DAF), for storing LSP to be established The destination address in tunnel, the form of expression of the destination address is address family+destination address, and address family includes IPv4 and IPv6, should The length of destination address field (DAF) is, for example, 3 bytes.Address length field, the tunnel mesh stored for storage purposes in address field Address total length, such as when tunnel destination address is IPv4 addresses, address size is 4 bytes, when tunnel destination address For IPv6 addresses when, address size is generally 16 bytes, and the length of the address length field is, for example, 1 byte.Address mask word Section, the mask of the tunnel destination address stored for storage purposes in address field, the length of the address mask field is, for example, 1 Byte.Tunnel type field, the tunnel type of the receiving node for storing current tunnel configuration message, tunnel type include Ingress, Transit or Egress, the length of the tunnel type field is, for example, 1 byte.Tunnel label field, work as tunnel-like When tunnel type in type-word section is Ingress, the tunnel label stored in tunnel label field is outgoing label, works as tunnel type When tunnel type in field is Transit or Egress, the tunnel label stored in tunnel label field is the tunnel into label The length of road label field is, for example, 3 bytes.Tunnel switching label field, the only tunnel type in tunnel type field are Effective during Transit, when tunnel type is other situations, the tunnel switching label field is invalid, such as could be arranged to sky Value, the length of the tunnel switching label field is, for example, 3 bytes.The next hop field in tunnel, disappear for storing current tunnel configuration The IP address of the next-hop node of the receiving node of breath, for example, IPv4 or IPv6, the length of the next hop field in the tunnel is for example For 4 bytes.Next-hop tunnel type field, between receiving node and next-hop node that message is configured for storing current tunnel The tunnel type in existing tunnel.Specifically, for example, the next-hop tunnel type can be LDP LSP, BGP LSP, TE or GRE etc., the length of the next-hop tunnel type field is, for example, 1 byte.Tunnel Identifier field, for storing next-hop tunnel-like Tunnel name corresponding to the tunnel type stored in type-word section, the length of the Tunnel Identifier field is, for example, 3 bytes.Tunnel Identifier is grown Field is spent, for the length of the tunnel name stored in storage tunneling identification field, the length of the Tunnel Identifier length field is for example For 1 byte.
Alternatively, in embodiments of the present invention, the tunnel route field of the tunnel configuration message also includes following field： Reverse tunnel associate field, the information for indicating reverse correlation tunnel is stored, only in multi-layer controller scene, the reverse tunnel Road associate field is effective, and subordinate controllers reverse correlation tunnel is instructed for higher controller, specifically, reverse tunnel association Field specifically includes reverse tunnel file-name field, and the length of the reverse tunnel file-name field is, for example, 2 bytes, reverse tunnel length word Section, the length of the reverse tunnel length field is, for example, 1 byte, and reverse tunnel address length field, the reverse tunnel address is grown The length for spending field is, for example, 1 byte, and reverse tunnel address mask field, the length of the reverse tunnel address mask field is for example For 1 byte, reverse tunnel destination address field (DAF), the length of the reverse tunnel destination address field (DAF) is, for example, 3 bytes.
Alternatively, in embodiments of the present invention, controller can also utilize network configuration (NETCONF) agreement under node Tunnel configuration message is sent out, the form of the tunnel configuration message based on NETCONF agreements can be the reticle of NETCONF agreements Formula, such as xsd tables.Specifically, each field as shown in Figure 4 is also included in the tunnel configuration message based on NETCONF agreements, For sake of simplicity, repeat no more here.
Specifically, also by taking scene shown in Fig. 3 as an example, the lsp tunnel that controller calculates is：<CSG1→ASG1→CSG2>, Controller is the lsp tunnel<CSG1→ASG1→CSG2>Distribute tunnel name Tunnel1.
Controller to the form of the tunnel configuration message issued of the CSG1 as Ingress nodes as shown in figure 4, wherein, Character string " Tunnel1 " is stored in tunnel file-name field；The length of character string " Tunnel1 " is stored in length of tunnel field；Purpose The purpose IP address of lsp tunnel, i.e. CSG2 IP address are stored in address field；Storage purpose address word in address length field The total length of the CSG2 stored in section IP address；The CSG2 stored in the field of address mask field storage purpose address IP The mask of location；Ingress is stored in tunnel type field；Tunnel label field storage outgoing label Label1；Tunnel switching label Field is invalid field；The next hop field storage ASG1 in tunnel IP address；Next-hop tunnel type field stores LDP LSP tunnels The tunnel type information in road；The tunnel of the LDP lsp tunnels stored in Tunnel Identifier field storage next-hop tunnel type field Name；The length of the tunnel name stored in Tunnel Identifier length field storage tunneling identification field；Reverse tunnel associate field is nothing Imitate field.
Form from controller to the tunnel configuration message issued of the ASG1 as Transit nodes also as shown in figure 4, its In, character string " Tunnel1 " is stored in tunnel file-name field；The length of character string " Tunnel1 " is stored in length of tunnel field；Mesh Address field in store the purpose IP address of lsp tunnel, i.e. CSG2 IP address；Storage purpose address in address length field The total length of the CSG2 stored in field IP address；The CSG2 stored in the field of address mask field storage purpose address IP The mask of address；Tunnel type field stores Transit；Tunnel label field is stored into label Label1；Tunnel switching label Field storage outgoing label Label2；The next hop field storage CSG2 in tunnel IP address；Next-hop tunnel type field stores TE Tunnel；Tunnel Identifier field stores the tunnel name of traffic engineering tunnel；Stored in Tunnel Identifier length field storage tunneling identification field The length of the tunnel name of traffic engineering tunnel；Reverse tunnel associate field is invalid field.
Form from controller to the tunnel configuration message issued of the CSG2 as Egress nodes also as shown in figure 4, wherein, Character string " Tunnel1 " is stored in tunnel file-name field；The length of character string " Tunnel1 " is stored in length of tunnel field；Purpose The purpose IP address of lsp tunnel, i.e. CSG2 IP address are stored in address field；Storage purpose address word in address length field The total length of the CSG2 stored in section IP address；The CSG2 stored in the field of address mask field storage purpose address IP The mask of location；Tunnel type field stores Egress；Tunnel label field is stored into label Label2；Tunnel switching label word Section, the next hop field in tunnel, next-hop tunnel type field, Tunnel Identifier field, Tunnel Identifier length field and reverse tunnel Associate field is that invalid field is invalid field.
Preferably, in embodiments of the present invention, in order to ensure the quick foundation of lsp tunnel, controller can be from calculating To the tail node of lsp tunnel start to issue tunnel configuration message, such as in scene shown in Fig. 3, controller is to CSG1, ASG1 , can be since tail node CSG2 when issuing tunnel configuration message with CSG2, upper hop node issues corresponding tunnel one by one Configure message.
Alternatively, in embodiments of the present invention, the S130 controllers are to the first node, first intermediate node and the periproct The tunnel name of the first cross-domain lsp tunnel is also carried in the tunnel configuration message that point issues, this method 100 also includes：
The controller according to the tunnel building ask, based on the network topology calculate the second cross-domain lsp tunnel, this second across The node that domain lsp tunnel passes through includes the first node, the second intermediate node and the tail node, second intermediate node and this first Intermediate node is incomplete same.
Specifically, second intermediate node instruction is located among the first node and the tail node in the 3rd lsp tunnel One or more forward node.It should be understood that in the first cross-domain lsp tunnel in second intermediate node and S120 first in Intermediate node is incomplete same.
The controller sends to the first node, second intermediate node and the tail node and carries the second cross-domain lsp tunnel Tunnel name tunnel configuration message, for indicate the first node, second intermediate node and the tail node establish this second across Domain lsp tunnel.
Specifically, also by taking scene shown in Fig. 3 as an example, network topology of the controller according to Fig. 3, CSG1 and CSG2 is calculated Between lsp tunnel, such as a lsp tunnel being calculated is：<CSG1—ASG2—CSG2>(correspond to the present invention to implement Example in the 3rd lsp tunnel), using tunnel direction as<CSG1→ASG2→CSG2>Exemplified by be described, then CSG1 is Ingress Node, ASG2 are Transit nodes, and CSG2 is Egress nodes.Label is distributed for CSG1, ASG2, CSG2, CSG1 is Ingress nodes, outgoing label Label3 is distributed for it；ASG2 is Transit nodes, and label Label3, bid are dispensed into for it Sign Label4；CSG2 is Egress nodes, and label Label4 is dispensed into for it.Controller is<CSG1→ASG1→CSG2>Configuration Tunnel name Tunnel2 (i.e. the entitled Tunnel2 in tunnel of the 3rd lsp tunnel).Then controller is respectively to CSG1, ASG2, CSG2 Associated tunnel configuration message is issued, to create lsp tunnel<CSG1→ASG2→CSG2>, detailed process and above-mentioned first cross-domain Lsp tunnel is (i.e.<CSG1→ASG1→CSG2>) correlated process it is similar, for brief introduction, repeat no more here.
It should be noted that controller is respectively to lsp tunnel<CSG1→ASG2→CSG2>In CSG1 and ASG2 issue Tunnel configuration message also carry next-hop tunnel information, to realize the tunnel that has been had built up by iteration efficiently to establish this Lsp tunnel<CSG1→ASG2→CSG2>.
It should be understood that in embodiments of the present invention, controller calculates between first node (CSG1) and tail node (CSG2) Two different lsp tunnels, and by being respectively that two lsp tunnels configure different tunnel names, to distinguish this two LSP tunnels Road.Forwarding unit receives the channel configuration information that controller issues, and can be distinguished different according to the tunnel name wherein carried Lsp tunnel.
Therefore, in embodiments of the present invention, controller calculates two different tunnels between first node and tail node, and By, to realize the foundation in two tunnels, and carrying corresponding tunnel in the message to the respective forward node issuing message in different tunnels The tunnel name in road, to distinguish the different tunnels between identical first node and tail node, therefore, the present invention can be more neatly real Two different tunnels are established between identical first node and tail node now.
For the scene of controller layering, the embodiment of the present invention also proposes a kind of method for determining cross-domain lsp tunnel, the party Method includes：
Controller obtains tunnel building request, and the tunnel building asks to establish the first end node and the second end segment for request Label switching path LSP tunnel between point, first end node belong to the first autonomous system, and second end node belongs to second Autonomous system, the first domain controller manage first autonomous system, and the second domain controller manages second autonomous system；
The controller is asked according to the tunnel building, it is determined that need by the network topology of first autonomous system with this The network topology of two autonomous systems calculates the first cross-domain lsp tunnel, and the first node of the first cross-domain lsp tunnel is first end segment Point, tail node are second end node；
The controller sends the first instruction message to first domain controller, and the first instruction message is established for instruction should Lsp tunnel in the first domain between first end node and the first boundary node of first autonomous system, the first instruction message It is intermediate node, the next-hop section of first boundary node also to indicate node headed by first end node, first boundary node Point is the second boundary node of second autonomous system, and the first instruction message is additionally operable to indicate the bid of first boundary node Label；
The controller sends the second instruction message to second domain controller, and the second instruction message is established for instruction should Lsp tunnel in the second domain between second end node and the second boundary node, the second instruction message also indicate second end Node is tail node, the second boundary node is intermediate node, and the second instruction message is additionally operable to indicate the second boundary node Enter label, the second boundary node to enter label identical with the outgoing label of first boundary node.
Specifically, as shown in figure 5, CSG1, CSG3, ASG1, ASBR1 be AS1 in router, CSG2, ASBR2 and ASBR3 is the router in AS2.Domain controller DC1 is responsible for the router in AS1, i.e., CSG1, CSG3, ASG1 with ASBR1, DC2 are responsible for the router in AS1, i.e. CSG2, ASBR2 and ASBR3.Controller is responsible for controlling DC1 and DC2, Know DC1 management AS1, DC2 management AS2.
It should be understood that the scene shown in Fig. 5 is the scene of controller layering, controller layering refers to opening up on complete network Row Hierarchical abstraction is put oneself into, high one layer of network topology ignores the internal information of low layer network topology, low one layer of network topology Receive and carry out secondary calculating decomposition further according to inner topology after the decomposition of high one layer of network topology.In Figure 5, DC1 can be obtained To AS1 network topology, DC2 can get AS2 network topology.Controller only obtains high one layer of network topology, that is, controls Device is only capable of getting AS1 and AS2 border router, i.e. ASBR1, ASBR2 and ASBR3, can also manage and control these borders Router.It should be understood that controller can't see the network topology inside AS1 and AS2, in other words, controller can not be managed directly AS1 and AS2 internal router.Certainly, controller is able to know that the end node of lsp tunnel to be established.In scene shown in Fig. 5 In, controller it can be seen that network topology be CSG1-ASBR1-ASBR2/3-CSG2.
For example, the tunnel building that controller receives asks the lsp tunnel for asking to establish between CSG1 and CSG2, it is assumed that Controller calculate lsp tunnel be<CSG1→ASBR1→ASBR3→CSG2>.Controller is the tunnel<CSG1→ASBR1→ ASBR3→CSG2>Distribute the entitled Tunnel1 in tunnel.
Controller finds CSG1, CSG2 not home control device management, then controller is only that ASBR1 exchanges with ASBR3 distribution Label, outgoing label L1 is distributed for ASBR1, and label L1 is dispensed into for ASBR3.
Controller can also notify corresponding PCEP to calculate the tunnel between ASBR1 and ASBR3, for shown in Fig. 5 across AS The scene in domain, PCEP tunnels between ASBR1 and ASBR2 establish a domain can also be notified.
Due to, AS1 and the not home control device management of AS2 internal nodes, therefore, controller is by remaining tunneled requests CSG1- ASBR1, ASBR3-CSG2 are issued to DC1, DC2 respectively.
Controller sends the request of the first tunnel building to DC1, and first tunnel building request carries following information：Establish CSG1 to ASBR1 lsp tunnel, and the tail node of the lsp tunnel is CSG2, ASBR1 Transit, ASBR1 next-hop section Point is ASBR3, and ASBR1 outgoing label is Label1.
Controller sends the request of the second tunnel building to DC1, and second tunnel building request carries following information：Establish ASBR3 to CSG2 lsp tunnel, and the tail node of the lsp tunnel is CSG2, ASBR3 Transit, ASBR3 next-hop section Point is CSG2, and the ASBR3 label that enters is Label1.
DC1 asks to calculate CSG1 to ASBR1 lsp tunnel according to the first tunnel building.Assuming that the lsp tunnel that DC1 is calculated For<CSG1→ASG1→ASBR1>, then CSG1 is Ingress, distributes outgoing label L3 for it, its next-hop node is ASG1； ASG1 is Transit, is dispensed into label L3, outgoing label L4 for it, its next-hop node is ASBR1；ASBR1 is Transit, is It is dispensed into label L4, outgoing label L1, and its next-hop node is ASBR3.
DC1 issues corresponding tunnel to CSG1, ASG1, ASBR1 respectively according to above-mentioned CSG1 to ASBR1 tunnel configuration Configuration information.Specifically, DC1 includes to the tunnel configuration message that CSG1 is issued：Entrance tunnels type (Ingress), outgoing label Label3 and next-hop node ASG1 IP address, next-hop tunnel information, can also include tunnel name Tunnel1；To ASG1 The tunnel configuration message issued includes：Transfer tunnel type (Transit), enter label Label3, outgoing label Label4 with it is next Hop node ASBR1 IP address, next-hop tunnel information, tunnel title Tunnel1 can also be included；The tunnel issued to ASBR1 Configuration message in road includes：Transfer tunnel type (Transit), enter label Label4, outgoing label Label1 and next-hop node ASBR3 IP address, next-hop tunnel information, tunnel title Tunnel1 can also be included.
Assuming that having been set up tunnel between domain between ASBR1 and ASBR3, then DC1 disappears to the tunnel configuration that ASBR1 is issued Next-hop tunnel information is carried in breath, the next-hop tunnel information is used to indicate the tunnel having built up between ASBR1 and ASBR3 Road, for indicating ASBR1 using the tunnel road that this has built up to ASBR3 forwarding service streams.
DC2 asks to calculate ASBR3 to CSG2 lsp tunnel according to the second tunnel building.Assuming that the lsp tunnel that DC2 is calculated For<ASBR3→CSG2>, ASBR3 Transit, label L1, outgoing label L5 are dispensed into for it, its next-hop node is CSG2； CSG2 is Egress, and label L5 is dispensed into for it.
DC2 issues corresponding tunnel configuration to ASBR3 and CSG2 respectively and believed according to above-mentioned ASBR3 to CSG2 tunnel configurations Breath.DC2 includes to the tunnel configuration message that ASBR2 is issued：Transfer tunnel type (Transit), enter label Label1, outgoing label Label5 and next-hop node CSG2 IP address, next-hop tunnel information, can also include tunnel title Tunnel1；To The tunnel configuration message that CSG2 is issued includes：Exit tunnel type (Egress), enter label Label5, tunnel name can also be included Claim Tunnel1.
So far, controller establishes CSG1 to CSG2 lsp tunnel, i.e., by DC1 and DC2<CSG1→ASG1→ ASBR1→ASBR3→CSG2>。
Therefore, in embodiments of the present invention, the controller need not obtain first autonomous system and second autonomous system Network topology, i.e., need not obtain overall network topology, by control domain controller can complete first node and tail node it Between tunnel building, therefore, the present invention can reduce calculating and the communications burden of controller.
Alternatively, in the embodiment shown in fig. 5, DC1 can utilize bgp protocol respectively under CSG1, ASG1 and ASBR1 Tunnel configuration message corresponding to hair, DC2 can issue corresponding tunnel configuration to ASBR3 and CSG2 respectively using bgp protocol and disappear Breath, the form of the tunnel configuration message as shown in figure 4, for sake of simplicity, repeat no more here.
It should be understood that lsp tunnel is directive, the foundation that describes above in association with Fig. 3 and Fig. 5 lsp tunnel end to end Method, be all to be described by taking tunnel direction as an example, such as in scene shown in Fig. 3, using tunnel direction as<CSG1→ ASG1→CSG2>Exemplified by be described, but the embodiment of the present invention is not limited to this, in embodiments of the present invention, controller pin To two tunnel end nodes (such as CSG1 and CSG2 in Fig. 3), bidirectional LSP tunnel can be established.
Such as in scene shown in Fig. 3, opposite direction lsp tunnel is calculated in controller<CSG2→ASG1→CSG1>, then The destination address of the opposite direction lsp tunnel is CSG1 IP address, CSG2 Ingress, outgoing label a, ASG1 is distributed for it For Transit, label a and outgoing label b, CSG1 Egress are dispensed into for it, label b is dispensed into for it.Controller is according to upper Configuration is stated, issues corresponding tunnel configuration message to CSG2, ASG1, CSG1 respectively.TE tunnels between CSG2 and ASG1 also be present Exemplified by road, then also carried in the tunnel configuration message that controller is sent to CSG2 for indicating that next-hop tunnel type is traffic engineering tunnel Information, communicated to connect for indicating that CSG2 passes through the traffic engineering tunnel and ASG1 and established.
For another example in the controller hierarchical scene shown in Fig. 5, bidirectional tunnel can also be established.Assuming that controller calculates CSG1 and CSG2 between reverse LSP paths be<CSG2→ASBR3→ASBR1→CSG1>(being reversely relative saying). Controller finds CSG1, CSG2 not home control device management, then controller is only ASBR1 and ASBR3 distribution switch labels, is controlled Device is that ASBR1 is dispensed into label Label2, and outgoing label Label2 is distributed for ASBR3.Because AS1 and AS2 internal nodes do not belong to Remaining tunneled requests CSG2-ASBR3, ASBR1-CSG1 are issued to DC2, DC1 by controller management, therefore, controller respectively.Control Device processed sends the request of the 3rd tunnel building to DC1, and the request of the 3rd tunnel building carries following information：Establish ASBR1 to CSG1 Lsp tunnel, and the tail node of the lsp tunnel is CSG1, and ASBR1 Transit, the ASBR1 label that enters are Label2.Control Device sends the request of the 4th tunnel building to DC1, and the request of the 4th tunnel building carries following information：Establish CSG2 to ASBR3's Lsp tunnel, and the tail node of the lsp tunnel is CSG1, ASBR3 Transit, ASBR3 outgoing label are Label2, ASBR3 Next-hop node be ASBR1.
DC1 asks to calculate ASBR1 to CSG1 lsp tunnel according to the 3rd tunnel building, it is assumed that the lsp tunnel that DC1 is calculated For<ASBR1→ASG1→CSG1>, and corresponding tunnel configuration information is issued to CSG1, ASG1, ASBR1 respectively, to establish LSP Tunnel is<ASBR1→ASG1→CSG1>, detailed process and above-mentioned positive tunnel (<CSG1→ASG1→ASBR1>) establish process It is similar, repeat no more here.Assuming that having been set up tunnel between domain between ASBR1 and ASBR3, then DC1 issues to ASBR1 Tunnel configuration message also includes next-hop tunnel information, and the next-hop tunnel information is used to indicate to establish between ASBR1 and ASBR3 Tunnel, i.e. tunnel between the domain, for indicating that ASBR1 utilizes between the domain tunnel to ASBR3 forwarding service streams.DC2 is according to the 4th Tunnel building request calculates CSG2 to ASBR3 lsp tunnel.Assuming that the lsp tunnel that DC2 is calculated is<CSG2→ASBR3>, respectively Corresponding tunnel configuration information is issued to ASBR3 and CSG2, to establish lsp tunnel<CSG2→ASBR3>.So far, controller leads to DC1 and DC2 are crossed, establishes CSG2 to CSG1 lsp tunnel, i.e.,<CSG2→ASBR3→ASBR1→ASG1→CSG1>.
Alternatively, in embodiments of the present invention, the association in bidirectional LSP tunnel can be established, in scene shown in Fig. 5, i.e., Associate positive lsp tunnel<CSG1→ASG1→ASBR1→ASBR3→CSG2>With reverse lsp tunnel<CSG2→ASBR3→ ASBR1→ASG1→CSG1>, reverse tunnel related information is carried in the tunnel configuration message that controller issues to forward node, Such as including tunnel name and tunnel address information etc..It should be understood that in the scene of individual layer controller shown in Fig. 3, can be by controlling Device directly issues the reverse tunnel related information to related forward node, for example, the tunnel that controller issues to related forward node Configuration message in road includes reverse tunnel associate field, and the related letter in reverse correlation tunnel is stored in the reverse tunnel associate field Breath, the reverse tunnel associate field specifically include reverse tunnel name field, reverse tunnel length field, reverse tunnel address length Field, reverse tunnel address mask field, reverse tunnel destination address field (DAF) are spent, as shown in Figure 4.It should also be understood that shown in Fig. 5 In multi-layer controller scene, top level control device (controller as shown in Figure 5) tells domain controller (DC1 as shown in Figure 5 first With DC2) reverse correlation tunnel relevant information, then the domain controller again to related forward node issue corresponding to reverse correlation tunnel Road information.
It should be understood that the positive tunnel being related in the embodiment of the present invention and reverse tunnel are relative sayings.
It should also be understood that in embodiments of the present invention, controller calculates LSP tunnels according to network topology, first node and tail node Road, circular can utilize the existing method for calculating end-to-end lsp tunnel, and contrast of the embodiment of the present invention does not limit It is fixed.But it should be noted that, in embodiments of the present invention, it is yet to be built that controller can utilize the lsp tunnel having had built up to determine Vertical lsp tunnel end to end, such as the traffic engineering tunnel shown in Fig. 3, in other words, the LSP tunnels calculated in the embodiment of the present invention The lsp tunnel that road can have been had built up with iteration.
It should also be understood that the example shown in Fig. 1, Fig. 3 and Fig. 5 is to preferably help those skilled in the art more preferably geographical The embodiment of the present invention is solved, rather than limits the invention to these specific forms.Those skilled in the art according to given Fig. 1, Fig. 3 and Fig. 5 example, it is clear that various modifications or change of equal value can be carried out, such modification or change also fall into the present invention It is merely illustrative and non-limiting in the range of embodiment.
Fig. 6 shows the schematic block diagram of controller 200 provided in an embodiment of the present invention, and the controller 200 includes：
Acquisition module 210, for obtaining tunnel building request, the tunnel building asks to establish first node and tail for request Label switching path LSP tunnel between node, the first node belong to different domains from the tail node；
Computing module 220, for the tunnel building request obtained according to the acquisition module, the is calculated based on network topology One cross-domain lsp tunnel, the node that the first cross-domain lsp tunnel passes through include the first node, the first intermediate node and the tail node, Wherein, have between the first node, first intermediate node and first node and section point in the tail node and have built up Tunnel, the network topology includes the tunnel having built up；
Sending module 230, for issuing corresponding tunnel configuration with the tail node to the first node, first intermediate node Message, for indicate the first node, first intermediate node and the tail node establish computing module calculating this is first cross-domain Lsp tunnel, wherein, the controller carries next-hop tunnel information to the tunnel configuration message that the first node is sent, and this is next Tunnel information is jumped to be used to indicate the tunnel having built up, the tunnel being had built up with to indicate the first node using this with this Two nodes are communicatively coupled.
Therefore, in embodiments of the present invention, controller is based on network topology and calculates cross-domain lsp tunnel, the network topology Include the tunnel having had built up, then controller can calculate cross-domain lsp tunnel based on the tunnel having been had built up in network. Specifically, controller is known according to network topology, and the cross-domain lsp tunnel to be calculated passes through first node and section point, and There is the tunnel having built up built up, then controller is directly had built up using this between one node and section point Tunnel determines the tunnel between the first node and section point, rather than calculates node by node between first node and section point Tunnel.For example, in scene shown in Fig. 3, without calculating the specific tunnel from ASG1 to CSG2 (assuming that ASG1 is not with CSG2 Direct-connected, the two also includes other multiple forward node before), ASG1 and CSG2 connection can be directly realized using traffic engineering tunnel. It should be understood that reducing the computation burden in the tunnel between first node and section point, it is whole that controller calculating can be reduced naturally The computation burden of the cross-domain lsp tunnel of bar.After the controller completes the calculating of cross-domain lsp tunnel, by being passed through to cross-domain lsp tunnel The forward node crossed issues corresponding tunnel configuration message, to complete the foundation of cross-domain lsp tunnel, wherein being sent out to first node Next-hop tunnel information is carried in the tunnel configuration message sent, the next-hop tunnel information is used to indicate the tunnel having built up, Communicated to connect with indicating that first node is established using the tunnel having built up with section point, rather than needed as prior art First segment can just be realized by issuing corresponding tunnel configuration message to each forward node between first node and section point Communication connection between point and section point, therefore, it is possible to reduce the signaling consumption of controller.In summary, of the invention real Apply in example, controller calculates cross-domain lsp tunnel using the tunnel having been had built up in network, can effectively reduce the calculation of controller Bear on road.Controller in tunnel configuration message by carrying next-hop tunnel information, without passing through to cross-domain lsp tunnel Each node issue tunnel configuration, the signaling consumption of controller can be reduced to a certain extent.Compared to prior art, this hair Bright embodiment can be born with the basis of signaling consumption, completing building for cross-domain lsp tunnel on the calculation road for effectively reducing controller It is vertical.
Alternatively, in embodiments of the present invention, the first node indicates the first node and first intermediate node.
Alternatively, in embodiments of the present invention, the sending module 230 is used for, using NETCONF agreements or bgp protocol to The first node, first intermediate node issue the corresponding tunnel configuration message with the tail node.
Alternatively, in embodiments of the present invention, the sending module 230 is specifically used for matching somebody with somebody to the first tunnel of first node transmission Message is put, the first tunnel configuration message carries following message：Entrance tunnels type, outgoing label, the IP address of next-hop node；
The sending module 230 is specifically used for sending the second tunnel configuration message, second tunnel to first intermediate node Configure message and carry following message：Transfer tunnel type, the IP address for entering label, outgoing label, next-hop node, this is among first Node to enter label identical with the outgoing label of the upper hop node of first intermediate node；
The sending module 230 is specifically used for sending the 3rd tunnel configuration message to the tail node, and the 3rd tunnel configuration disappears Breath carries following message：Exit tunnel type, enter label, the tail node enters going out for label and the upper hop node of the tail node Label is identical.
Alternatively, in embodiments of the present invention, the sending module 230 is to the first node, first intermediate node and the tail The tunnel name of the first cross-domain lsp tunnel is also carried in the tunnel configuration message that node issues；
The computing module 220 is additionally operable to, and is asked according to the tunnel building, and the second cross-domain LSP is calculated based on the network topology Tunnel, the node that the second cross-domain lsp tunnel passes through include the first node, the second intermediate node and the tail node, and this is in second Intermediate node and first intermediate node are incomplete same；
The sending module 230 is additionally operable to, to the first node, second intermediate node and the tail node send carry this second The tunnel configuration message of the tunnel name of cross-domain lsp tunnel, for indicating that the first node, second intermediate node and the tail node are built Found the second cross-domain lsp tunnel that the computing module calculates.
It should be understood that controller according to embodiments of the present invention may correspond to the cross-domain lsp tunnel of determination of the embodiment of the present invention Method in controller, and above and other operation and/or function of the modules in controller is respectively in order to realize The corresponding flow of each method in Fig. 2, Fig. 3 and Fig. 5, for sake of simplicity, will not be repeated here.
Fig. 7 shows the schematic block diagram of the network equipment 300 provided in an embodiment of the present invention, and the network equipment 300 includes：
Cross-domain label switched path lsp tunnel is established in receiving module 310, the instruction that is used for for receiving controller transmission Tunnel configuration message, the tunnel configuration message carry next-hop tunnel information, and the next-hop tunnel information is used to indicate the network The tunnel having built up having between the network equipment of equipment 300 and second, the cross-domain lsp tunnel include the tunnel having built up Road；
Module 320 is established, for the tunnel configuration message received according to the receiving module, the tunnel being had built up by this Road is established with second network equipment and communicated to connect.
In embodiments of the present invention, cross-domain lsp tunnel is established by the tunnel being had built up in network, can effectively be subtracted Small controller calculates the burden on road, while can also reduce the expense that signaling is transmitted between controller and the network equipment.
Alternatively, in embodiments of the present invention, the network equipment 300 be the cross-domain lsp tunnel first node, the reception mould The tunnel configuration message that block 310 receives also carries following message：Entrance tunnels types, outgoing label, the IP of next-hop node Location, the next-hop node are second network equipment；Or
The network equipment 300 is the intermediate node of the cross-domain lsp tunnel, the tunnel configuration that the receiving module 310 receives Message also carries following message：Transfer tunnel type, the IP address for entering label, outgoing label, next-hop node, the next-hop node For second network equipment, the outgoing label phase for entering label and the upper hop node of the network equipment 300 of the network equipment 300 Together.
In embodiments of the present invention, after the tunnel configuration message that the network equipment 300 is issued according to the controller, under One jumps tunnel information, it is determined that the tunnel having built up, and be the tunnel distributing tunnel ID that this has built up, and generate forward table .Specifically, when the network equipment 300 is the first node of cross-domain lsp tunnel, the forwarding-table item is with including tunnel purpose IP Location, outgoing label, the IP address of next-hop node, next-hop tunnel ID.When the centre that the network equipment 300 is cross-domain lsp tunnel During node, the forwarding-table item include tunnel purpose IP address, enter label, it is the IP address of outgoing label, next-hop node, next Jump tunnel ID.When the network equipment 300 is the tail node of some cross-domain lsp tunnel, the forwarding-table item includes tunnel purpose IP address is with entering label.
It should be understood that the network equipment 300 according to embodiments of the present invention may correspond to the cross-domain LSP of determination of the embodiment of the present invention First node and/or intermediate node in the method in tunnel, and above and other operation of the modules in the network equipment 300 And/or function is respectively in order to realize the corresponding flow of each method in Fig. 2, Fig. 3 and Fig. 5, for sake of simplicity, no longer superfluous herein State.
Fig. 8 shows another schematic block diagram of controller 400 provided in an embodiment of the present invention, and the controller 400 includes place Manage device 410, memory 420, bus system 430, receiver 440 and transmitter 450.Wherein, processor 410, memory 420, Receiver 440 is connected with transmitter 450 by bus system 430, and the memory 420 is used for store instruction, and the processor 410 is used In the instruction for performing the memory 420 storage, to control the reception signal of receiver 440, and transmitter 450 is controlled to send signal. Wherein, processor 410 is used for, and obtains tunnel building request, and the tunnel building asks to establish first node and tail node for request Between label switching path LSP tunnel, the first node belongs to different domains from the tail node；Asked according to the tunnel building, First cross-domain lsp tunnel is calculated based on network topology, the node that the first cross-domain lsp tunnel passes through includes the first node, first Intermediate node and the tail node, wherein, the first node, first intermediate node and the first node in the tail node and the second section There is the tunnel having built up, the network topology includes the tunnel having built up between point.The transmitter 450 is used for, to The first node, first intermediate node issue corresponding tunnel configuration message with the tail node, for indicate the first node, this One intermediate node establishes the first cross-domain lsp tunnel with the tail node, wherein, the tunnel that the controller is sent to the first node Configure message and carry next-hop tunnel information, the next-hop tunnel information is used to indicate the tunnel having built up, should with instruction First node is communicatively coupled using the tunnel that this has built up and the section point.
Therefore, in embodiments of the present invention, controller calculates cross-domain LSP tunnels using the tunnel having been had built up in network Road, it can effectively reduce the calculation road burden of controller.Controller by tunnel configuration message carry next-hop tunnel information, Each node without passing through to cross-domain lsp tunnel issues tunnel configuration, can reduce the letter of controller to a certain extent Make expense.Compared to prior art, this hair embodiment can effectively reduce the base for calculating road burden and signaling consumption of controller On plinth, the foundation of cross-domain lsp tunnel is completed.
Alternatively, in embodiments of the present invention, the first node indicates the first node and first intermediate node.
Alternatively, in embodiments of the present invention, transmitter 450 is used for, using NETCONF agreements or bgp protocol to the head Node, first intermediate node issue the corresponding tunnel configuration message with the tail node.
Alternatively, in embodiments of the present invention, transmitter 450 is used for, and the first tunnel configuration message is sent to the first node, The first tunnel configuration message carries following message：Entrance tunnels type, outgoing label, the IP address of next-hop node；
Transmitter 450 is used for, and the second tunnel configuration message, the second tunnel configuration message are sent to first intermediate node Carry following message：Transfer tunnel type, the IP address for entering label, outgoing label, next-hop node, first intermediate node enter Label is identical with the outgoing label of the upper hop node of first intermediate node；
Transmitter 450 is used for, and the 3rd tunnel configuration message is sent to the tail node, under the 3rd tunnel configuration message carries Column information：Exit tunnel type, enter label, the outgoing label phase for entering label and the upper hop node of the tail node of the tail node Together.
Alternatively, in embodiments of the present invention, transmitter 450 is to the first node, first intermediate node and the tail node The tunnel name of the first cross-domain lsp tunnel is also carried in the tunnel configuration message issued；
The processor 410 is used for, and is asked according to the tunnel building, and the second cross-domain lsp tunnel is calculated based on the network topology, The node that the second cross-domain lsp tunnel passes through includes the first node, the second intermediate node and the tail node, second intermediate node It is incomplete same with first intermediate node；
The transmitter 450 is used for, and sends that to carry this second cross-domain to the first node, second intermediate node and the tail node The tunnel configuration message of the tunnel name of lsp tunnel, it is somebody's turn to do for indicating that the first node, second intermediate node and the tail node are established Second cross-domain lsp tunnel.
It should be understood that controller 400 according to embodiments of the present invention may correspond to the cross-domain LSP tunnels of determination of the embodiment of the present invention Controller in the method in road, and controller 200 according to embodiments of the present invention is can correspond to, and in controller 400 Modules above and other operation and/or function respectively in order to realize the corresponding of each method in Fig. 2, Fig. 3 and Fig. 5 Flow, for sake of simplicity, will not be repeated here.
Fig. 9 shows another schematic block diagram of the network equipment 500 provided in an embodiment of the present invention, and the network equipment 500 wraps Include processor 510, memory 520, bus system 530, receiver 540 and transmitter 550.Wherein, processor 510, memory 520th, receiver 540 is connected with transmitter 550 by bus system 530, and the memory 520 is used for store instruction, the processor 510 are used to perform the instruction that the memory 520 stores, and to control the reception signal of receiver 540, and control transmitter 550 to send Signal.Wherein, receiver 540 is used for, and receives the instruction that is used for that controller is sent and establishes cross-domain label switched path lsp tunnel Tunnel configuration message, the tunnel configuration message carry next-hop tunnel information, and the next-hop tunnel information is used to indicate institute State the tunnel having built up having between the network equipment of the network equipment 500 and second, the cross-domain lsp tunnel include it is described The tunnel being set up；Processor 510 is used for, according to the tunnel configuration message, by the tunnel having built up with it is described Second network equipment establishes communication connection.
Therefore, in embodiments of the present invention, controller calculates cross-domain LSP tunnels using the tunnel having been had built up in network Road, it can effectively reduce the calculation road burden of controller.Controller by tunnel configuration message carry next-hop tunnel information, Each node without passing through to cross-domain lsp tunnel issues tunnel configuration, can reduce the letter of controller to a certain extent Make expense.Compared to prior art, the embodiment of the present invention can be born and signaling consumption on the road of calculating for effectively reducing controller On the basis of, complete the foundation of cross-domain lsp tunnel.
Alternatively, in embodiments of the present invention, the network equipment 500 is the first node of the cross-domain lsp tunnel, and the network is set Standby 500 tunnel configuration message received also carry following message：Entrance tunnels types, outgoing label, the IP of next-hop node Location, the next-hop node are second network equipment；Or
The network equipment 500 is the intermediate node of the cross-domain lsp tunnel, the tunnel configuration that the network equipment 500 receives Message also carries following message：Transfer tunnel type, the IP address for entering label, outgoing label, next-hop node, the next-hop node For second network equipment, the outgoing label phase for entering label and the upper hop node of the network equipment 500 of the network equipment 500 Together.
It should be understood that the network equipment 500 according to embodiments of the present invention may correspond to the cross-domain LSP of determination of the embodiment of the present invention First node or intermediate node in the method in tunnel, and the network equipment 300 according to embodiments of the present invention is can correspond to, and And above and other operation and/or function of the modules in the network equipment 500 is respectively in order to realize in Fig. 2, Fig. 3 and Fig. 5 Each method corresponding flow, for sake of simplicity, will not be repeated here.
Figure 10 shows the schematic block diagram of controller control system 600 provided in an embodiment of the present invention, the controller control System 600 processed includes controller 610 and the network equipment 620, and the controller 610 is controller 200 provided in an embodiment of the present invention Or controller 400, the network equipment 620 are the network equipment 300 provided in an embodiment of the present invention or the network equipment 500.
In embodiments of the present invention, controller is based on network topology and calculates cross-domain lsp tunnel, and the network topology includes The tunnel having had built up, then controller can be based on the cross-domain lsp tunnel of tunnel calculating having been had built up in network.Specifically Ground, controller know that the cross-domain lsp tunnel to be calculated passes through first node and section point, and first segment according to network topology There is the tunnel that has built up, then the tunnel that controller is directly had built up using this determines described the between point and section point Tunnel between one node and section point, rather than the tunnel between first node and section point is calculated node by node.For example, In scene shown in Fig. 3, without calculating the specific tunnel from ASG1 to CSG2 (assuming that ASG1 and CSG2 and indirectly connected, before the two Also include other multiple forward node), ASG1 and CSG2 connection can be directly realized using traffic engineering tunnel.It should be understood that reduce The computation burden in the tunnel between first node and section point, controller can be reduced naturally and calculate the cross-domain lsp tunnel of whole piece Computation burden.After the controller completes the calculating of cross-domain lsp tunnel, pass through the forward node passed through to cross-domain lsp tunnel Corresponding tunnel configuration message is issued, to complete the foundation of cross-domain lsp tunnel, wherein in the tunnel configuration sent to first node Next-hop tunnel information is carried in message, the next-hop tunnel information is used to indicate the tunnel having built up, to indicate first segment Point is established with section point using the tunnel that has built up and communicated to connect, rather than need as prior art to first node with Each forward node between section point, which issues corresponding tunnel configuration message, can just realize first node and section point Between communication connection, therefore, it is possible to reduce the signaling consumption of controller.In summary, in embodiments of the present invention, controller Cross-domain lsp tunnel is calculated using the tunnel having been had built up in network, can effectively reduce the calculation road burden of controller.Controller By carrying next-hop tunnel information in tunnel configuration message, without under each node for passing through to cross-domain lsp tunnel Tunnel configuration is sent out, the signaling consumption of controller can be reduced to a certain extent.Compared to prior art, the embodiment of the present invention can Born on the calculation road for effectively reducing controller with the basis of signaling consumption, completing the foundation of cross-domain lsp tunnel.
It should also be understood that first, second, third, fourth and the various digital numbers that are referred to herein are only for convenience of description The differentiation of progress, it is not intended to limit the scope of the embodiment of the present invention.
It should be understood that in various embodiments of the present invention, the size of the sequence number of above-mentioned each process is not meant to perform suitable The priority of sequence, the execution sequence of each process should be determined with its function and internal logic, without the implementation of the reply embodiment of the present invention Process forms any restriction.
Those of ordinary skill in the art are it is to be appreciated that the list of each example described with reference to the embodiments described herein Member and algorithm steps, it can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually Performed with hardware or software mode, application-specific and design constraint depending on technical scheme.Professional and technical personnel Described function can be realized using distinct methods to each specific application, but this realization is it is not considered that exceed The scope of the present invention.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description, The specific work process of device and unit, the corresponding process in preceding method embodiment is may be referred to, will not be repeated here.
In several embodiments provided herein, it should be understood that disclosed systems, devices and methods, can be with Realize by another way.For example, device embodiment described above is only schematical, for example, the unit Division, only a kind of division of logic function, can there is other dividing mode, such as multiple units or component when actually realizing Another system can be combined or be desirably integrated into, or some features can be ignored, or do not perform.It is another, it is shown or The mutual coupling discussed or direct-coupling or communication connection can be the indirect couplings by some interfaces, device or unit Close or communicate to connect, can be electrical, mechanical or other forms.
The unit illustrated as separating component can be or may not be physically separate, show as unit The part shown can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple On NE.Some or all of unit therein can be selected to realize the mesh of this embodiment scheme according to the actual needs 's.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, can also That unit is individually physically present, can also two or more units it is integrated in a unit.
If the function is realized in the form of SFU software functional unit and is used as independent production marketing or in use, can be with It is stored in a computer read/write memory medium.Based on such understanding, technical scheme is substantially in other words The part to be contributed to prior art or the part of the technical scheme can be embodied in the form of software product, the meter Calculation machine software product is stored in a storage medium, including some instructions are causing a computer equipment (can be People's computer, server, or network equipment etc.) perform all or part of step of each embodiment methods described of the present invention. And foregoing storage medium includes：USB flash disk, mobile hard disk, read-only storage (ROM, Read-Only Memory), arbitrary access are deposited Reservoir (RAM, Random Access Memory), magnetic disc or CD etc. are various can be with the medium of store program codes.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.

Claims (13)

  1. A kind of 1. method for determining cross-domain label switched path tunnel, it is characterised in that including：
    Controller obtains tunnel building request, and the tunnel building asks the mark for asking to establish between first node and tail node Switching path lsp tunnel is signed, the first node belongs to different domains from the tail node；
    The controller is asked according to the tunnel building, based on network topology calculate the first cross-domain lsp tunnel, described first across The node that domain lsp tunnel passes through includes the first node, the first intermediate node and the tail node, wherein, the first node, institute Stating has the tunnel having built up, the net between the first intermediate node and first node and section point in the tail node Network topology includes the tunnel having built up；
    The controller issues corresponding tunnel configuration to the first node, first intermediate node with the tail node respectively Message, for indicating that the first node, first intermediate node and the tail node establish the described first cross-domain lsp tunnel, Wherein, the controller carries next-hop tunnel information, the next-hop to the tunnel configuration message that the first node is sent Tunnel information is used to indicate the tunnel having built up, with indicate the first node utilize described in the tunnel that has built up with The section point is communicatively coupled.
  2. 2. according to the method for claim 1, it is characterised in that the controller is respectively to the first node, described first Intermediate node issues corresponding tunnel configuration message with the tail node, including：
    The controller sends the first tunnel configuration message to the first node, and the first tunnel configuration message carries following letter Breath：Entrance tunnels type, outgoing label, the IP address of next-hop node；
    The controller sends the second tunnel configuration message to first intermediate node, and the second tunnel configuration message carries Following message：Transfer tunnel type, the IP address for entering label, outgoing label, next-hop node, first intermediate node enter mark Label are identical with the outgoing label of the upper hop node of first intermediate node；
    The controller sends the 3rd tunnel configuration message to the tail node, and the 3rd tunnel configuration message carries following letter Breath：Exit tunnel type, enter label, the outgoing label phase for entering label and the upper hop node of the tail node of the tail node Together.
  3. 3. method according to claim 1 or 2, it is characterised in that the controller is respectively to the first node, described The tunnel name of the described first cross-domain lsp tunnel is also carried in the tunnel configuration message that one intermediate node issues with the tail node, Methods described also includes：
    The controller is asked according to the tunnel building, and the second cross-domain lsp tunnel is calculated based on the network topology, and described the The node that two cross-domain lsp tunnels pass through includes the first node, the second intermediate node and the tail node；
    The controller sent respectively to the first node, second intermediate node and the tail node carry described second across The tunnel configuration message of the tunnel name of domain lsp tunnel, for indicating the first node, second intermediate node and the periproct Point establishes the described second cross-domain lsp tunnel.
  4. 4. according to the method in any one of claims 1 to 3, it is characterised in that the controller utilizes network configuration NETCONF agreements or Border Gateway Protocol (BGP) issue to the first node, first intermediate node with the tail node respectively Corresponding tunnel configuration message.
  5. A kind of 5. method for determining cross-domain label switched path tunnel, it is characterised in that including：
    First network equipment receives the tunnel configuration for being used to indicate to establish cross-domain label switched path lsp tunnel that controller is sent Message, the tunnel configuration message carry next-hop tunnel information, and the next-hop tunnel information is used to indicate first net The tunnel being had built up between network equipment and second network equipment, the cross-domain lsp tunnel include the tunnel having built up；
    The first network equipment passes through the tunnel having built up and second network according to the tunnel configuration message Equipment establishes communication connection.
  6. 6. according to the method for claim 5, it is characterised in that the first network equipment is the cross-domain lsp tunnel First node, the tunnel configuration message that the first network equipment receives also carry following message：Entrance tunnels type, bid Label, the IP address of next-hop node, the next-hop node is second network equipment；Or
    The first network equipment is the intermediate node of the cross-domain lsp tunnel, the tunnel of the first network equipment reception Configuration message in road also carries following message：Transfer tunnel type, the IP address for entering label, outgoing label, next-hop node, under described One hop node is second network equipment, the upper hop for entering label and the first network equipment of the first network equipment The outgoing label of node is identical.
  7. A kind of 7. controller, it is characterised in that including：
    Acquisition module, for obtaining tunnel building request, the tunnel building asks to establish first node and tail node for request Between label switching path LSP tunnel, the first node belongs to different domains from the tail node；
    Computing module, for the tunnel building request obtained according to the acquisition module, first is calculated based on network topology Cross-domain lsp tunnel, the node that the first cross-domain lsp tunnel passes through include the first node, the first intermediate node and the tail Node, wherein, have between the first node, first intermediate node and first node and section point in the tail node There is the tunnel having built up, the network topology includes the tunnel having built up；
    Sending module, for issuing corresponding tunnel with the tail node to the first node, first intermediate node respectively Message is configured, for indicating that the first node, first intermediate node are established the computing module with the tail node and calculated The described first cross-domain lsp tunnel, wherein, the tunnel configuration message that the controller is sent to the first node carries next Tunnel information is jumped, the next-hop tunnel information is used to indicate the tunnel having built up, to indicate the first node profit It is communicatively coupled with the tunnel having built up with the section point.
  8. 8. controller according to claim 7, it is characterised in that the sending module is specifically used for sending out to the first node The first tunnel configuration message is sent, the first tunnel configuration message carries following message：It is entrance tunnels type, outgoing label, next The IP address of hop node；
    The sending module is specifically used for sending the second tunnel configuration message to first intermediate node, and second tunnel is matched somebody with somebody Put message and carry following message：Transfer tunnel type, the IP address for entering label, outgoing label, next-hop node, among described first Node to enter label identical with the outgoing label of the upper hop node of first intermediate node；
    The sending module is specifically used for sending the 3rd tunnel configuration message, the 3rd tunnel configuration message to the tail node Carry following message：Exit tunnel type, enter label, the tail node enters label and the upper hop node of the tail node Outgoing label is identical.
  9. 9. the controller according to claim 7 or 8, it is characterised in that the sending module is to the first node, described The tunnel name of the described first cross-domain lsp tunnel is also carried in the tunnel configuration message that one intermediate node issues with the tail node；
    The computing module is additionally operable to, and is asked according to the tunnel building, and the second cross-domain LSP tunnels are calculated based on the network topology Road, the node that the second cross-domain lsp tunnel passes through include the first node, the second intermediate node and the tail node；
    The sending module is additionally operable to, and is sent to the first node, second intermediate node and the tail node described in carrying The tunnel configuration message of the tunnel name of second cross-domain lsp tunnel, for indicating the first node, second intermediate node and institute State tail node and establish the described second cross-domain lsp tunnel that the computing module calculates.
  10. 10. the controller according to any one of claim 7 to 9, it is characterised in that the sending module is used for, and utilizes Network configuration NETCONF agreements or Border Gateway Protocol (BGP) are respectively to the first node, first intermediate node and the tail Node issues corresponding tunnel configuration message.
  11. A kind of 11. network equipment, it is characterised in that including：
    Receiving module, the tunnel for being used to indicate to establish cross-domain label switched path lsp tunnel for receiving controller transmission are matched somebody with somebody Message is put, the tunnel configuration message carries next-hop tunnel information, and the next-hop tunnel information is used to indicate the network The tunnel being had built up between equipment and second network equipment, the cross-domain lsp tunnel include the tunnel having built up；
    Module is established, for the tunnel configuration message received according to the receiving module, passes through the tunnel having built up Road is established with second network equipment and communicated to connect.
  12. 12. the network equipment according to claim 11, it is characterised in that the network equipment is the cross-domain lsp tunnel First node, the tunnel configuration message that the receiving module receives also carries following message：Entrance tunnels type, bid Label, the IP address of next-hop node, the next-hop node is second network equipment；Or
    The network equipment is the intermediate node of the cross-domain lsp tunnel, and the tunnel configuration that the receiving module receives disappears Breath also carries following message：Transfer tunnel type, the IP address for entering label, outgoing label, next-hop node, the next-hop node For second network equipment, the outgoing label phase for entering label and the upper hop node of the network equipment of the network equipment Together.
  13. 13. a kind of controller control system, it is characterised in that the controller control system is included as in claim 7 to 10 Controller described in any one and the network equipment as described in claim 11 or 12.
CN201610402567.0A 2016-06-08 2016-06-08 A kind of method, apparatus and system for determining cross-domain label switched path tunnel Pending CN107483338A (en)

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