CN109962850A - The method and controller and computer readable storage medium of realization Segment routing - Google Patents
The method and controller and computer readable storage medium of realization Segment routing Download PDFInfo
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- CN109962850A CN109962850A CN201711333464.4A CN201711333464A CN109962850A CN 109962850 A CN109962850 A CN 109962850A CN 201711333464 A CN201711333464 A CN 201711333464A CN 109962850 A CN109962850 A CN 109962850A
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- 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
- H04L45/12—Shortest path evaluation
- H04L45/123—Evaluation of link metrics
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- 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]
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- 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
- H04L45/74—Address processing for routing
- H04L45/745—Address table lookup; Address filtering
- H04L45/748—Address table lookup; Address filtering using longest matching prefix
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Abstract
The invention discloses a kind of methods for realizing Segment routing and controller and computer readable storage medium, are related to the communications field.This method comprises: controller determines the destination node of data packet or in the Egress node of management domain according to the destination address of the data packet for the Ingress node for reaching management domain；According to Ingress node and binding purpose node or Egress node, determine data packet in the forward-path of management domain；According to each address of node prefix label in forward-path, the forwarding label stack information of forward-path is formed；The forwarding label stack information of forward-path is sent to Ingress node, so that data are forwarded a packet to destination node or Egress node according to the forwarding label stack information of forward-path.The Segment routing scheme realized implements fairly simple relative to conventional segmented routing plan.
Description
Technical field
This disclosure relates to the communications field, in particular to a kind of method for realizing Segment routing and controller and computer-readable
Storage medium.
Background technique
Segment routing (Segment Routing, SR) technology is a kind of similar multiprotocol label switching (Multi-
Protocol Label Switching, MPLS) label forwarding technology, the technology by searching for Label Forwarding Information Base realize data
Forwarding.Two kinds of segmentation labels, respectively address prefix label (Prefix-SID) and adjacent label (Adj- are defined at present
SID).Address prefix label has global uniqueness.Adjacent label is only locally significant.
The existing method for realizing Segment routing, each node need the address prefix label of oneself passing through internal gateway
Agreement (Interior Gateway Protocol, IGP) agreement is advertised to other nodes, also, each node is according to routing table
The corresponding address prefix label of purpose IP address is searched, obtains forwarding label stack information further according to the mode of source routing.This method
It is more complicated.
Summary of the invention
An embodiment of the present disclosure technical problem to be solved is: the existing method for realizing Segment routing is more complicated
The problem of.
An aspect of this disclosure proposes a kind of method for realizing Segment routing, comprising: controller is according to arrival management domain
The destination address of data packet of Ingress node determine the destination node of the data packet or the Egress node in the management domain；
According to the Ingress node and in conjunction with the destination node or the Egress node, determine the data packet in the management domain
Forward-path；According to each address of node prefix label in the forward-path, the forwarding mark of the forward-path is formed
Sign stack information；The forwarding label stack information of the forward-path is sent to the Ingress node, so as to according to the forwarding road
The data are forwarded a packet to the destination node or the Egress node by the forwarding label stack information of diameter.
Optionally, this method further include: the controller is that each node in the management domain distributes address prefix mark
Label.
Optionally, the controller distributes address prefix label using flow table for each node in the management domain,
In, the header field of the flow table increases Segment routing protocol fields, and the action fields of the flow table are increased for indicating distribution point
The type value corresponding with for indicating the type of section routing tag is the address prefix label of distribution.
Optionally, the forwarding label stack information of the forward-path is sent to the entrance using flow table by the controller
Node, wherein the header field of the flow table increases Segment routing protocol fields, and the action fields of the flow table are increased for indicating
The type of Segment routing data forwarding value corresponding with for indicating the type is that the forwarding label stack of the forward-path is believed
Breath.
Optionally it is determined that the data packet the management domain forward-path also according to network state.
Another aspect of the disclosure proposes a kind of controller for realizing Segment routing, comprising: node determining module is used for
The destination node of the data packet is determined or in the pipe according to the destination address of the data packet for the Ingress node for reaching management domain
Manage the Egress node in domain；Path determination module, for according to the Ingress node and in conjunction with the destination node or the outlet
Node determines the data packet in the forward-path of the management domain；Label stack determining module, for according to the forward-path
In each address of node prefix label, form the forwarding label stack information of the forward-path；Sending module is used for institute
The forwarding label stack information for stating forward-path is sent to the Ingress node, so as to according to the forwarding label stack of the forward-path
The data are forwarded a packet to the destination node or the Egress node by information.
Optionally, controller further include: label distribution module, for being each node in the management domain using flow table
Distribute address prefix label, wherein the header field of the flow table increases Segment routing protocol fields, and the action fields of the flow table increase
Having added for the type value corresponding with for indicating the type for indicating assignment segments routing tag is the address prefix distributed
Label.
Optionally, the sending module, for being sent to the forwarding label stack information of the forward-path using flow table
The Ingress node, wherein the header field of the flow table increases Segment routing protocol fields, and the action fields of the flow table increase
Type value corresponding with for indicating the type for indicating Segment routing data forwarding is the forwarding of the forward-path
Label stack information.
The another aspect of the disclosure proposes a kind of controller for realizing Segment routing, comprising: memory；And it is coupled to
The processor of the memory, the processor is configured to the instruction based on storage in the memory, executes above-mentioned
The method for realizing Segment routing.
Another aspect of the disclosure proposes a kind of computer readable storage medium, is stored thereon with computer program, should
The method above-mentioned for realizing Segment routing is realized when program is executed by processor.
The disclosure is formed the forwarding label stack information of the forward-path of data packet by controller, and is sent in management domain
Ingress node, so that Ingress node is forwarded data packet according to forwarding label stack information, the Segment routing scheme realized
It is implemented relative to conventional segmented routing plan fairly simple.In addition, being each node distribution in management domain by controller
Address prefix label realizes the unified management of address prefix label.
Detailed description of the invention
Attached drawing needed in embodiment or description of Related Art will be briefly described below.According to following ginseng
According to the detailed description of attached drawing, the disclosure can be more clearly understood,
It should be evident that the accompanying drawings in the following description is only some embodiments of the present disclosure, skill common for this field
For art personnel, without any creative labor, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the schematic network structure that the disclosure realizes Segment routing.
Fig. 2 shows an examples of the improved OpenFlow flow table of the disclosure.
Fig. 3 is the flow chart of method one embodiment that the disclosure realizes Segment routing.
Fig. 4 is the structural schematic diagram of controller one embodiment that the disclosure realizes Segment routing.
Fig. 5 is the structural schematic diagram for the controller further embodiment that the disclosure realizes Segment routing.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present disclosure, the technical solution in the embodiment of the present disclosure is carried out clear, complete
Site preparation description.
The disclosure proposes a kind of scheme that Segment routing is realized based on controller.The program is by controller in management domain
Address prefix label is managed collectively, and forms forwarding label stack information, and be sent to the node in management domain.
Fig. 1 is the schematic network structure that the disclosure realizes Segment routing.As shown in Figure 1, a management domain includes control
Device and several nodes.Five nodes for being identified as R1, R2, R3, R4 and R5 are illustratively shown in Fig. 1.Pass through between each node
Physical connection connection.It is connected between controller and node by control channel.If controller is SDN (Software Defined
Network, software defined network) controller, it is (open that the control channel between SDN controller and node can be OpenFlow
Stream) interface.Node for example can be the network equipments such as router or interchanger.
Controller can distribute address prefix label for each node in management domain, to realize address prefix label
Unified management.One example of node and its address prefix label of distribution is as shown in table 1.The address prefix mark of controller distribution
Label can be sent to node by control channel.
Table 1
| Node | Address prefix label |
| R1 | 11 |
| R2 | 12 |
| R3 | 13 |
| R4 | 14 |
| R5 | 15 |
In one embodiment, OpenFlow interface is improved.Controller can use improved OpenFlow flow
Table is that each node in management domain distributes address prefix label.
Fig. 2 shows an examples of improved OpenFlow flow table.As shown in Fig. 2, each stream of OpenFlow flow table
List item is made of 3 parts, including being used for statistical match data packet for data packet matched header field (Header Fields)
Several counters (Counters) is used to indicate the movement (Actions) how matched data packet is handled.
Segment routing (SR) protocol fields are increased in header field.In addition, further include existing field in header field, for example,
Interchanger ingress port, source MAC (media access control), purpose MAC, ethernet type, VLAN (virtual LAN) mark,
VLAN priority, source IP, destination IP, IP agreement field, IP type of service.
The action fields of OpenFlow flow table include field type (Type), length (Len), value (Value).In OpenFlow
The action fields of flow table increase the type (Type1) for being used to indicate assignment segments routing tag and the corresponding value for indicating type
(Value1) it is the address prefix label of distribution, realizes the distribution of address prefix label.
The increased type of action fields (Type1) and value (Value1) are for example are as follows:
Type1: assignment segments routing tag
Value1: address prefix label
Fig. 3 is the flow chart of method one embodiment that the disclosure realizes Segment routing.As shown in figure 3, the embodiment
Method includes:
Step 310, controller determines data packet according to the destination address of the data packet for the Ingress node for reaching management domain
Destination node or Egress node in management domain.
Wherein, if the destination address of data packet is in management domain, it is determined that the destination node of data packet, if the mesh of data packet
Address not in management domain, it is determined that the Egress node in management domain of data packet.
For example, data packet reaches the Ingress node R1 of management domain, controller determines that R4 is according to the destination address of data packet
Destination node or Egress node.
Step 320, controller determines data packet in management domain according to Ingress node and binding purpose node or Egress node
Forward-path.Forward-path can make data packet reach destination node or Egress node from Ingress node.
Further, it is also possible to determine data packet in the forward-path of management domain according to network state.Network state for example including
Bandwidth or load etc..For example, being selected network-like in communication path between Ingress node and destination node (or Egress node)
Forward-path of the optimal communication path of state as data packet.For example, the communication path work that selection bandwidth is most wide or most lightly loaded
For the forward-path of data packet.
Step 330, controller forms turning for forward-path according to each address of node prefix label in forward-path
Send out label stack information.
For example, the address of node prefix label with reference to shown in forward-path shown in fig. 1 and table 1, the then forwarding formed
The forwarding label stack information in path is as shown in table 2.
Table 2
| Forwarding label stack information |
| 11 |
| 12 |
| 15 |
| 14 |
Step 340, the forwarding label stack information of forward-path is sent to Ingress node by controller.
In one embodiment, OpenFlow interface is improved.Controller can use improved OpenFlow flow
The forwarding label stack information of forward-path is sent to Ingress node by table.
With reference to Fig. 2 shows improved OpenFlow flow table an example.Wherein, the header field of flow table increases segmentation road
By protocol fields, the action fields of flow table increase type (Type2) for indicating Segment routing data forwarding and for indicating
The corresponding value (Value2) of type is the forwarding label stack information of forward-path.
The increased type of action fields (Type2) and value (Value2) are for example are as follows:
Type2: Segment routing data forwarding
Value2: forwarding label stack information (as shown in table 2)
Step 350, other nodes in Ingress node and forward-path will according to the forwarding label stack information of forward-path
Data forward a packet to destination node or Egress node.
For example, Ingress node R1 carries out SR encapsulation to corresponding data packet according to forwarding label stack information, and according to forwarding
Label stack information delivers a packet to next-hop node R2, after next-hop node R2 receives the data packet of SR encapsulation, according to
Forwarding label stack information delivers a packet to next-hop node R5, after next-hop node R5 receives the data packet of SR encapsulation,
Destination node R4 or Egress node R4 are delivered a packet to according to forwarding label stack information.
Above-described embodiment is formed the forwarding label stack information of the forward-path of data packet by controller, and is sent to management domain
In Ingress node, so that Ingress node is forwarded data packet according to forwarding label stack information, the Segment routing realized
Scheme implements fairly simple relative to conventional segmented routing plan.
Fig. 4 is the structural schematic diagram of controller one embodiment that the disclosure realizes Segment routing.As shown in figure 4, the control
Device 40 processed includes:
Node determining module 410, the destination address for the data packet according to the Ingress node for reaching management domain determine number
Destination node according to packet or the Egress node in management domain；
Path determination module 420, for determining that data packet exists according to Ingress node and binding purpose node or Egress node
The forward-path of management domain；
Label stack determining module 430, for forming forwarding according to each address of node prefix label in forward-path
The forwarding label stack information in path；With
Sending module 440, for the forwarding label stack information of forward-path to be sent to Ingress node, so as to according to forwarding
Data are forwarded a packet to destination node or Egress node by the forwarding label stack information in path.
Optionally, sending module 440, for the forwarding label stack information of forward-path to be sent to entrance section using flow table
Point, wherein the header field of flow table increases Segment routing protocol fields, and the action fields of flow table are increased for indicating Segment routing number
It is the forwarding label stack information of forward-path according to the type of forwarding value corresponding with for indicating type.
The forwarding label stack information of the forward-path of data packet, and the entrance section being sent in management domain are formed by controller
Point, so that Ingress node is forwarded data packet according to forwarding label stack information, the Segment routing scheme realized relative to
Conventional segmented routing plan implements fairly simple.
Optionally, controller further include: label distribution module 400, for being each node in management domain using flow table
Distribute address prefix label, wherein the header field of flow table increases Segment routing protocol fields, the action fields of flow table increase for
The type value corresponding with for indicating type for indicating assignment segments routing tag is the address prefix label of distribution.
By each node distribution address prefix label that controller is in management domain, the unification of address prefix label is realized
Management.
Fig. 5 is the structural schematic diagram for the controller further embodiment that the disclosure realizes Segment routing.As shown in figure 5, should
Controller 50 includes: memory 510 and the processor 520 for being coupled to the memory 510, and processor 520 is configured as being based on
The instruction being stored in memory 510, the method for executing the realization Segment routing in any one aforementioned embodiment.
Wherein, memory 510 is such as may include system storage, fixed non-volatile memory medium.System storage
Device is for example stored with operating system, application program, Boot loader (Boot Loader) and other programs etc..
Controller 50 can also include input/output interface 530, network interface 540, memory interface 550 etc..These interfaces
It can for example be connected by bus 560 between 530,540,550 and memory 510 and processor 520.Wherein, input and output
The input-output equipment such as interface 530 is display, mouse, keyboard, touch screen provide connecting interface.Network interface 540 is various
Networked devices provide connecting interface.The external storages such as memory interface 550 is SD card, USB flash disk provide connecting interface.
The disclosure also proposes a kind of computer readable storage medium, is stored thereon with computer program, and the program is processed
Device realizes the method above-mentioned for realizing Segment routing when executing.
Those skilled in the art should be understood that embodiment of the disclosure can provide as method, system or computer journey
Sequence product.Therefore, complete hardware embodiment, complete software embodiment or combining software and hardware aspects can be used in the disclosure
The form of embodiment.Moreover, it wherein includes the calculating of computer usable program code that the disclosure, which can be used in one or more,
Machine can use the meter implemented in non-transient storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of calculation machine program product.
The disclosure is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present disclosure
Figure and/or block diagram describe.It is interpreted as to be realized by computer program instructions each in flowchart and/or the block diagram
The combination of process and/or box in process and/or box and flowchart and/or the block diagram.It can provide these computer journeys
Sequence instruct to general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices processor with
A machine is generated, so that the instruction generation executed by computer or the processor of other programmable data processing devices is used for
Realize the dress for the function of specifying in one or more flows of the flowchart and/or one or more blocks of the block diagram
It sets.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
The foregoing is merely the preferred embodiments of the disclosure, not to limit the disclosure, all spirit in the disclosure and
Within principle, any modification, equivalent replacement, improvement and so on be should be included within the protection scope of the disclosure.
Claims (10)
1. a kind of method for realizing Segment routing, comprising:
Controller determines the destination node of the data packet according to the destination address of the data packet for the Ingress node for reaching management domain
Or the Egress node in the management domain；
According to the Ingress node and in conjunction with the destination node or the Egress node, determine the data packet in the management
The forward-path in domain；
According to each address of node prefix label in the forward-path, the forwarding label stack letter of the forward-path is formed
Breath；
The forwarding label stack information of the forward-path is sent to the Ingress node, so as to turning according to the forward-path
It sends out label stack information and the data is forwarded a packet into the destination node or the Egress node.
2. the method as described in claim 1, further includes:
The controller is that each node in the management domain distributes address prefix label.
3. method according to claim 2, wherein the controller utilizes each node point that flow table is in the management domain
With address prefix label,
Wherein, the header field of the flow table increases Segment routing protocol fields, and the action fields of the flow table are increased for indicating
The type of assignment segments routing tag value corresponding with for indicating the type is the address prefix label of distribution.
4. the method for claim 1, wherein the controller utilizes flow table by the forwarding label stack of the forward-path
Information is sent to the Ingress node,
Wherein, the header field of the flow table increases Segment routing protocol fields, and the action fields of the flow table are increased for indicating
The type of Segment routing data forwarding value corresponding with for indicating the type is that the forwarding label stack of the forward-path is believed
Breath.
5. the method for claim 1, wherein determine the data packet the management domain forward-path also according to net
Network state.
6. a kind of controller for realizing Segment routing, comprising:
Node determining module, the destination address for the data packet according to the Ingress node for reaching management domain determine the data packet
Destination node or Egress node in the management domain；
Path determination module, for determining institute according to the Ingress node and in conjunction with the destination node or the Egress node
Data packet is stated in the forward-path of the management domain；
Label stack determining module, for forming described turn according to each address of node prefix label in the forward-path
Send out the forwarding label stack information in path；
Sending module, for the forwarding label stack information of the forward-path to be sent to the Ingress node, so as to according to institute
The data are forwarded a packet to the destination node or the Egress node by the forwarding label stack information for stating forward-path.
7. controller as claimed in claim 6, further includes:
Label distribution module, for being that each node in the management domain distributes address prefix label using flow table, wherein institute
The header field for stating flow table increases Segment routing protocol fields, and the action fields of the flow table are increased for indicating that assignment segments route
The type of label value corresponding with for indicating the type is the address prefix label of distribution.
8. controller as claimed in claim 6, wherein the sending module, for utilizing flow table by the forward-path
Forwarding label stack information is sent to the Ingress node,
Wherein, the header field of the flow table increases Segment routing protocol fields, and the action fields of the flow table are increased for indicating
The type of Segment routing data forwarding value corresponding with for indicating the type is that the forwarding label stack of the forward-path is believed
Breath.
9. a kind of controller for realizing Segment routing, comprising:
Memory；And
It is coupled to the processor of the memory, the processor is configured to the instruction based on storage in the memory,
The method that perform claim requires realization Segment routing described in any one of 1-5.
10. a kind of computer readable storage medium, is stored thereon with computer program, power is realized when which is executed by processor
Benefit requires the method that Segment routing is realized described in any one of 1-5.
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