CN101505227B - Method, device and system for implementing point to multi-point pseudowire - Google Patents
Method, device and system for implementing point to multi-point pseudowire Download PDFInfo
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Abstract
The invention discloses a method for achieving point-to-multipoint pseudo-wires, which comprises the following steps: establishing a border gateway protocol (BGP) protocol with downstream node equipment through negotiation according to the collected network topology information; and sending a BGP message to the downstream node equipment, wherein the BGP message carries point-to-multipoint pseudo-wire labels specifically distributed to a virtual private multicast service (VPMS) embodiment to establish the point-to-multipoint pseudo-wires. The embodiment of the invention also provides corresponding equipment and a system. The technical proposal of the invention does not need static configuration, but needs dynamic establishment, thus the efficiency for establishing the point-to-multipoint pseudo-wires is improved; besides, relative to the static configuration, the accuracy rate of configuration is improved.
Description
Technical field
The present invention relates to technical field of telecommunications, be specifically related to method, equipment and the system of a kind of realization point to multi-point pseudowire (P2MPPW, Point to Multi-point Pseudo Wire).
Background technology
At two-layer virtual private network (L2VPN; Layer 2 Virtual Private Network) in; Defined the multiple business type, for example, the professional (VPWS of VLL; Virtual Private Wire Service) and VPLS (VPLS, Virtual Private LAN Service) etc.The VPWS business provides a kind of L2VPN of point-to-point professional, and VPLS is used for emulation Ethernet local area network (LAN) (LAN, LocalArea Network) business.In existing L2VPN, can provide simple point-to-multipoint service or LAN professional, but for put multiple spot (P2MP, Point to Multi-Point) professional provide more loaded down with trivial details.Realize that based on existing framework P2MP is professional; Need be accomplished to the process of setting up in the path of each receiving terminal through the source; And need the source to send data, will cause source Provider Edge (PE, Provider Edge) equipment like this over-burden and cause the serious waste of Internet resources to each receiving terminal; And virtual private multicast service (VPMS, Virtual Private Multicast Service) can satisfy the professional demand of this P2MP.
VPMS is a kind of new business structure, can provide based on the transmission path of putting multiple spot, satisfies P2MP traffic transmission demand.VPMS specifically accomplishes through the P2MP PW that is based upon on packet switching network (PSN, the PacketSwitching Network) tunnel.The key point of VPMS is the foundation of P2MP PW.
Creating a mechanism of existing P 2MP PW can be accomplished through static configuration; In practical application; Through whole Internet resources and node are accomplished statistics; And the topological identification information (P2MP PW Topology Identify ID) of the label (VPMS Instance Label) that the specific VPMS srvice instance of configuration is corresponding on the Provider Edge PE equipment on the specific P2MP PSN tunnel, VPMS srvice instance sign (VPMS Instance ID) and the P2MP PW that set up, thereby set up P2MP PW.
In research and practice process to prior art, inventor of the present invention finds, in the prior art owing to be static configuration; Need add up whole Internet resources and node during configuration; Therefore need the resource of maintenance loaded down with trivial details, workload is bigger, and possibly cause error configurations.
Summary of the invention
The embodiment of the invention provides a kind of method, equipment and system that realizes point to multi-point pseudowire, can improve efficient and accuracy rate that point to multi-point pseudowire is set up.
The embodiment of the invention specifically realizes through following technical scheme:
A kind of method that realizes point to multi-point pseudowire comprises:
According to the network topological information of collecting, set up Border Gateway Protocol (BGP) with negotiation between the downstream node equipment and be connected;
Equipment sends the BGP message to downstream node, carries the point to multi-point pseudowire label of the special-purpose multicast service VPMS of promising particular virtual example allocation in the said BGP message, sets up point to multi-point pseudowire.
A kind of router comprises: the unit and first transmitting element are set up in information collection unit, connection, wherein:
Information collection unit is used for the collection network topology information;
Connect and set up the unit, be used for setting up Border Gateway Protocol (BGP) with negotiation between the downstream node equipment and being connected according to the network topological information of collecting;
First transmitting element is used for after BGP connects foundation, and equipment sends the BGP message to downstream node, carries the point to multi-point pseudowire label of the special-purpose multicast service VPMS of promising particular virtual example allocation in the said BGP message, sets up point to multi-point pseudowire.
A kind of system that realizes point to multi-point pseudowire comprises: first node equipment and Section Point equipment, and said Section Point equipment is downstream node equipment, wherein:
First node equipment is used for the collection network topology information, and according to the network topological information of collecting, sets up Border Gateway Protocol (BGP) with negotiation between the said Section Point equipment and be connected; And after BGP connects foundation, send the BGP message to said Section Point equipment, and carry the point to multi-point pseudowire label of the special-purpose multicast service VPMS of promising particular virtual example allocation in the said BGP message, set up point to multi-point pseudowire;
Section Point equipment is used for the collection network topology information, according to the network topological information of collecting, sets up BGP with negotiation between the said first node equipment and is connected; Receive the BGP message that first node equipment sends, from said message, be retrieved as the point to multi-point pseudowire label of specific VPMS example allocation, the point to multi-point pseudowire between foundation and the first node equipment.
The embodiment of the invention adopt with downstream node equipment between set up BGP and be connected after; Generate BGPUPDATE message and equipment transmission to downstream node; Carry the P2MP PW label that promising said specific VPMS srvice instance distributes in the said BGP UPDATE message, thereby can set up P2MP PW, because said method does not need static configuration; But dynamically set up, therefore can improve the efficient of setting up of P2MP PW; And, can improve configuration accuracy with respect to static configuration.
Description of drawings
Fig. 1 is a P2MP SS-PW reference model sketch map in the embodiment of the invention;
Fig. 2 is a P2MP MS-PW reference model sketch map in the embodiment of the invention;
Fig. 3 is method embodiment one flow chart of realizing P2MP SS-PW in the embodiment of the invention;
Fig. 4 is the heading structural representation of BGP message in the embodiment of the invention;
Fig. 5 is a BGP OPEN message body structure sketch map in the embodiment of the invention;
Fig. 6 is the Optional Parameters structural representation of expanding in the embodiment of the invention;
Fig. 7 is the BGP UPDATE message body structure sketch map after the expansion in the embodiment of the invention;
Fig. 8 is the BGP VPMS NLRI regional structure sketch map of expanding in the embodiment of the invention;
Fig. 9 is method embodiment two structural representations of realizing P2MP PW in the embodiment of the invention;
Figure 10 is the BGP UPDATE message body that includes P2MP PW revocation information in the embodiment of the invention;
Figure 11 is method embodiment three flow charts of realizing P2MP PW in the embodiment of the invention;
Figure 12 is router one structural representation in the embodiment of the invention;
Figure 13 is router two structural representations in the embodiment of the invention;
Figure 14 is router three structural representations in the embodiment of the invention;
Figure 15 is router four structural representations in the embodiment of the invention;
Figure 16 is system embodiment one structural representation of realizing P2MP PW in the embodiment of the invention;
Figure 17 is system embodiment two structural representations of realizing P2MP PW in the embodiment of the invention.
Embodiment
The embodiment of the invention provides a kind of method, equipment and system that realizes point to multi-point pseudowire, and (BGP, Border Getway Protocol) realizes P2MP PW through extending boundary gateway protocol, can improve efficient and accuracy rate that P2MPPW sets up.Followingly be elaborated with reference to accompanying drawing.
BGP is one of most important Routing Protocol on the internet, can be applied to the scene of striding autonomous territory (AS, Autonomour System) and cross operator.BGP is the dynamic route discovery agreement between a kind of autonomous system; Its basic function is between autonomous system, to exchange loop-free routing iinformation automatically; The path reachability information that has autonomous system number (AS) sequence properties through exchange; Construct the topological diagram of autonomous area, thereby eliminate route loop and implement user configured routing policy.
Wherein, autonomous system is meant: by same technical management organization management, use the set of the certain router of unified routing policy.Each autonomous system all has unique autonomous system numbering, and this numbering is that the management organization by the internet mandate distributes.Numbering through different is distinguished different autonomous.At present, the Serial Number Range of autonomous system is 1 to 65535, and wherein 1 to 65411 is internet numberings of registration, and 65412 to 65535 is dedicated network numberings.
BGP provides four kinds of type of messages, is respectively and opens (OPEN), keeps connectivity (KEEPALIVE), upgrades (UPDATE) and notice (NOTIFICATION).Wherein, exchange separately version, autonomous system number through sending the OPEN message between bgp peer, information such as retention time, BGP identifier are held consultation.What the UPDATE message carried is routing update information, comprising cancelling routing iinformation and accessibility routing iinformation and path attribute thereof.When BGP detects mistake (connect to interrupt, consult to make mistakes, message mistake etc.), send the NOTIFICATION message, close the connection of peer-to-peer.The KEEPALIVE message sends between bgp peer periodically, and is effective with what guarantee to connect.
In embodiments of the present invention, according to the network topological information of collecting, set up BGP with negotiation between the downstream node equipment and be connected; Equipment sends the BGP message to downstream node then, carries the point to multi-point pseudowire label of promising specific VPMS example allocation in the said BGP message, sets up point to multi-point pseudowire.
P2MP PW has the pseudo-line (SS-PW, Single Segment Pseudo Wire) of P2MP single hop and two kinds of models of P2MP multi-segment pseudo-wires (MS-PW, Multiple Segment Pseudo Wire), sees figures.1.and.2 respectively.
For P2MP SS-PW, P2MP PW is PW tree, at one independently in the P2MP PW topology; Comprise a source end and a plurality of leaf end points; Wherein the source end is connected with each leaf end points through a P2MP PW, isolates each other between the leaf end points, does not communicate between the leaf end points.
Fig. 1 is a P2MP SS-PW reference model sketch map in the embodiment of the invention; Customer edge (CE; Customer Edge) equipment 101 is access devices of user side, is responsible for user traffic flow is mail to PE equipment 103 through place in circuit (AC, Access Circuit) 102; To support the L2VPN protocols on the PE equipment 103; Being included on the chain of command the pseudo-line of setting up PE equipment 103 PE equipment 103 to the opposite end through signaling connects; Accomplish the Layer 2 data isl frame on the data surface to Internet protocol/multiprotocol label switching (IP/MPLS; International Protocol/Multiple Protocol Label Switching) encapsulation of mark bag/go encapsulation and handled function, and the mark bag is sent to opposite end PE equipment 103 through the PW105 in the P2MP PSN tunnel 104; Operator (P, Provider) equipment 106 is supported the transparent transmission of L2VPN Business Stream, does not support the L2VPN rules, only works to provide bearer path, the P2MP PSN tunnel of setting up between the PE equipment 103 104 can pass through a plurality of P equipment 106; AC102 typically refers to the user and inserts the employed asynchronous transfer mode (ATM of L2VPN system; Asynchronous TransferMode) virtual circuit, frame relay (FR; Frame Router) virtual circuit or Ethernet virtual local area network (LAN) (VLAN, Virtul Local Area Network) link; PW105 is meant the connection that utilizes the L2VPN signaling to set up between the PE equipment 103; PE equipment 103 is sent to opposite end PE equipment 103 with the Layer 2 data frame that AC102 transmits through PW105, and opposite end PE equipment 103 recovers or regenerate two layers of isl frame to be sent to opposite end AC102 again; Many PW105 can multiplexingly pass the PE equipment 103 toward the opposite end from PE equipment 103 in a P2MP PSN tunnel 104.
In VPMS uses, for unidirectional P2MP SS-PW, the PE equipment 103-1 in the source, and the simulation example of a point to multiple spot is provided between the leaf PE equipment 103-2, PE equipment 103-3, PE equipment 103-4.In this framework, can PE equipment be divided into two set, i.e. source set and leaf set.Do not send other data messages except that the control message between the equipment in the identity set.
With reference to Fig. 3, for realizing method embodiment one flow chart of P2MP SS-PW in the embodiment of the invention, according to the network topological information of collecting; Set up BGP between source PE equipment and the leaf PE equipment and be connected, and said BGP connect set up after, source PE equipment sends the BGP message to leaf PE equipment; Carry the P2MP PW label of promising specific VPMS example allocation in the said BGP message; Set up P2MP PW, below be elaborated through concrete scene, concrete steps are following:
S301: the information of P2MP SS-PW is set up in configuration on PE equipment;
For example, can on source PE equipment and leaf PE equipment, dispose the following information that is used to set up P2MP SS-PW: (ID Identify), is used to identify a P2MP tree for VPMS instance identification and P2MP PW sign.
The information configured type is according to employed forwarding equivalence class (FEC; Forwarding EquivalenceClass) type is different and different; For example: when using FEC128; The IP address that needs configuration P2MPPW ID and far-end PE, identical connection group identifier (AGI, Attachment Group Identifier), P2MP PW ID and the IP address of equipment of configuration when using FEC 129.During the present invention implemented, for the main configuration of BGP application was P2MP PW ID.
S302:PE equipment is collected network topological information;
In practical implementation; Can pass through webmaster static configuration collection network topology information and P2MP PSN tunnel information, source PE equipment and leaf PE equipment also can utilize the BGP auto discovery mechanism to accomplish network topological information and P2MP PSN tunnel information collecting.For example, can understand belong to certain specific VPMS instance identification equipment with and the AC state that connected (because the AC state can determine the role of PE in network, also promptly determine this equipment to belong to source device or belong to leaf equipment) etc.
Set up the BGP connection through sending the OPEN message negotiation between S303, the PE equipment;
Wherein, can expand, indicate self support VPMS performance through in BGP OPEN message, carrying the BGP performance parameter to BGP OPEN message.
The BGP message normally is made up of heading and message body, and wherein, the heading structure of BGP message is as shown in Figure 4, authentication information (Marker): 16 bytes, complete 1, the effect of this mark mainly is to be used for detecting whether losing synchronously between bgp peer.
The length of message (Length): 2 bytes, indicate the length of whole message, comprise leader length, minimum BGP message-length is 19 bytes (KEEPALIVE messages), maximum length is 4096 bytes.
The type of message (Type): 1 byte, the indication type of message is like OPEN, UPDATE message etc., wherein: 1 expression OPEN message, 2 expression UPDATE messages, 3 expression NOTIFICATION messages, 4 expression KEEPALIVE messages.
With reference to Fig. 5, be BGP OPEN message body structure sketch map, the byte that each parameter field is shared usually and the implication of representative are distinguished as follows:
Version (Version): 1 byte, transmit leg bgp version number;
Local autonomous territory (My Autonomous System): 2 byte signless integers, local AS number;
Retention time (Hold Time): 2 byte signless integers, the retention time of transmit leg suggestion;
BGP identifier (BGP Identifier): 4 bytes, the PE device identifier of transmit leg;
Optional parameters length (Optional Parameters Len): 1 byte, the length of optional parameter;
Optional parameters (Optional Parameters): variable-length, optional parameter.
The beginning of message partly comprises the Version of version number of BGP and the autonomous system MyAutonomous System of transmit leg.Retention time field Hold Time is setting number second of transmit leg maintenance timer that foundation is provided.Keep timer to stipulate that bgp neighbor thinks the effective time span of caller information.
BGP Identifier is the sign of BGP transmit leg, and this value is carried out confirming in the process of handshake operation between the BGP peer-entities, and between each local interface and each bgp peer, remained unchanged.
In embodiments of the present invention, can carry Capability announcement indication PE equipment through the Optional Parameters in the expansion OPEN message and whether support the VPMS instance.With reference to Fig. 6, be the Optional Parameters structural representation of expanding in the embodiment of the invention, wherein:
Performance coding (Capability code): 1 byte, be used to represent the performance parameter coding, be chosen as with standard agreement in the value of not conflicting;
Performance length (Capability Length): 1 byte, performance parameter length is the length of performance number CapabilityValue;
Performance number (Capability Value): 1 byte, for example, support VPMS if be set to 0 sign, otherwise do not support.
For the OPEN message processing procedure that carries the Capability performance parameter, be consistent with specification recommendation (RFC, Requests for Comments) 3392.
S304, source PE equipment are specific VPMS example allocation P2MP PW label, generate BGP UPDATE message, and send to leaf PE equipment;
Can be at BGP UPDATE message expansion BGP VPMS network reachability information (NLRI; Network Layer Reach-ability Information) accomplishes the announcement of setting up P2MP PW information needed; With reference to Fig. 7; Be the BGP UPDATE message body structure sketch map after the expansion in the embodiment of the invention, byte and implication that each parameter field is shared are following:
Address-Family Identifier symbol (AFI, Address Family Identifier): 2 bytes, be defined as L2VPN, value is 25;
Subsequence Address-Family Identifier symbol (SAFI, Subsequent Address Family Identifier): 1 byte, be defined as retention, specifically can be with reference to the IANA standard.
Next hop address length: 1 byte, the network address length of next jumping in the marked network;
Next hop address: variable-length, the network address of next jumping that sign arrives at the destination;
NLRI length (NLRI length): 1 byte, the length of sign NLRI value;
NLRI value (NLRI value): variable-length.
With reference to Fig. 8, be the BGP VPMS NLRI regional structure sketch map of expanding in the embodiment of the invention, NLRI length (NLRI length) zone in the alternate figures 7 of the BGP VPMS NLRI that is expanded zone and NLRI value (NLRI value) zone wherein:
Length (Length): 2 bytes are used to replace the NLRI length shown in Fig. 7;
VPMS instance identification (VPMS Instance ID): 4 bytes are used to identify certain VPMS Service Instance;
PE ID:8 byte is used for identification sources PE equipment;
VPMS example label (Label for VPMS Instance): 4 bytes are used to carry the label that is used to identify P2MP PW that source PE equipment distributes for certain specific VPMS Service Instance, i.e. P2MP PW label;
Point to multi-point pseudowire sign (P2MP PW ID): 2 bytes, be used to identify the topology of certain P2MP PW, this value overall situation in network is unique, and the PE equipment of configuration equal values belongs to identical P2MP PW topology;
Reserved value (Reserved): variable-length is used for subsequent expansion and uses.
S305: leaf PE equipment reads message information after receiving BGP UPDATE message, obtains the label that source PE devices allocation is given certain VPMS Instance, accomplishes the foundation of P2MP PW.
P2MP PW is based upon on the P2MP PSN tunnel, and the process of setting up of P2PM PW the source PE equipment on the specific P2MP PSN tunnel of being is the process that the srvice instance branch on the said specific P2MP PSN tunnel is used in sign P2MP PW label.
Can find out from present embodiment; After setting up the BGP connection between source PE equipment and the leaf PE equipment, generate BGP UPDATE message, carrying active PE equipment in the said BGP UPDATE message is the label that is used to identify P2MP PW that said specific VPMS srvice instance distributes; Thereby can set up P2MP PW; Because said method does not need static configuration, but dynamically set up, therefore can improve the efficient of setting up of P2MP PW; And, can improve configuration accuracy with respect to static configuration.
In practical implementation, can also be through the expansion bgp protocol, accomplish the cancelling of the P2MP PW that set up, with reference to Fig. 9, be method embodiment two structural representations of realizing P2MP PW in the embodiment of the invention, concrete steps are following:
S901: source PE equipment receives the NOTIFICATION message;
The NOTIFICATION message mainly leaf PE equipment make a mistake or the pent situation of leaf PE equipment under use, this message carries various error codes (like timer expiry etc.), comprises error code, auxiliary error code and error message etc.
It is understandable that, also can be other the alarm or the notification message that are used for management maintenance P2MP PW.
S902: said source PE equipment generates and to comprise the BGP UPDATE message of cancelling (withdraw) information and to send to leaf PE equipment, cancel and said leaf PE equipment between the P2MP PW that set up.
With reference to Figure 10, for including the BGP UPDATE message body of P2MP PW revocation information in the embodiment of the invention, AFI and SAFI identify revocation information jointly; Wherein:
The AFI:2 byte is defined as L2VPN, and value is 25;
The SAFI:1 byte is defined as retention, specifically can be with reference to the IANA standard;
VPMS Instance ID:4 byte is used to identify certain the VPMS Service Instance that will cancel;
Label for VPMS Instance:4 byte is used to identify the label of the P2MP PW that will cancel, i.e. P2MP PW label.
In practical implementation, can also accomplish maintenance and management through the expansion bgp protocol to the P2MP PW that is set up, with reference to Figure 11, for realizing method embodiment three flow charts of P2MP PW in the embodiment of the invention, concrete steps are following:
S1101: certain leaf PE device activation state changes;
Leaf PE equipment can become unactivated state from state of activation, also can become state of activation from unactivated state.
S1102: the leaf PE equipment that said state of activation changes generates BGP UPDATE message and sends to source PE equipment;
The BGP VPMS NLRI that is expanded in the BGP UPDATE message that is generated can be with reference to Fig. 7, wherein carries the state information of the leaf PE equipment that said state changed.
S1103: source PE equipment generates BGP UPDATE message and sends to leaf PE equipment; Carrying active PE equipment in the said BGPUPDATE message is the P2MP PW sign that the VMPS srvice instance on the specific P2MP PSN tunnel is distributed; Leaf PE equipment obtains said P2MP PW sign, can realize the renewal of P2MPPW.
It is thus clear that; In the present embodiment when the state of activation of certain leaf PE equipment changes; This leaf PE equipment comprise through generation the P2MP PW on this PE label and said P2MP PW topology and send to source PE equipment through BGP UPDATE message; Thereby accomplish the renewal of P2MP PW, because said renewal is to dynamically update, so maintenance cost is lower.
It is understandable that; In practical implementation, leaf PE equipment also can send BGP UPDATE message to Network Management Equipment when state of activation changes; Carry the state information of said leaf PE equipment in the said message; Said Network Management Equipment is to source PE equipment dispatch order, and source PE equipment sends BGP UPDATE message to said leaf PE equipment after receiving notice; The P2MP PW label that to carry active PE equipment in the said BGP UPDATE message be specific VPMS example allocation, thus realize the renewal of P2MP PW.
More than to realize that P2MP SS-PW is that example specifies, it is understandable that said method also can be applied among the P2MP MS-PW.Be with the difference of P2MP SS-PW; Introduced pseudo-line trochanterion (S-PE; Switching Provider Edge) notion of equipment; PE equipment is set up pseudo-line with S-PE equipment respectively and is connected, and PE equipment reduces the quantity of end-to-end netted connection between the PE equipment to connecting end to end of PE equipment having become the connection of transferring through one or more S-PE equipment through the switching of S-PE equipment.
With reference to Fig. 2; Be P2MP MS-PW reference model sketch map in the embodiment of the invention; Customer edge (CE, Customer Edge) equipment 201 passes through place in circuit (AC as the access device of user side with user traffic flow; Access Circuit) 202 mails to terminal Provider Edge (T-PE, Terminating ProviderEdge) equipment 203; To support the L2VPN protocols equally on the T-PE equipment 203; Being included on the chain of command the pseudo-line of setting up T-PE equipment 203 T-PE equipment 203 to the opposite end through signaling connects; Accomplish the Layer 2 data isl frame on the data surface to the encapsulation of IP/MPLS mark bag/go to encapsulate and the handled function, and the mark bag is sent to opposite end T-PE equipment 203 through the PW205 in the P2MPPSN tunnel 204; S-PE is used to terminate and is connected with the pseudo-line in the upper reaches of upstream node equipment; Begin simultaneously and the pseudo-line in the downstream of downstream node equipment; And be that the pseudo-line of pseudo-line in the said upper reaches and downstream is set up mapping relations; The mapping relations sign of distributing the pseudo-line in the said upper reaches and the pseudo-line in downstream is mapped to the downstream pseudo line tag with the pseudo line tag of upper reaches puppet line; PW205 is meant and utilizes being connected that the L2VPN signaling sets up between T-PE equipment 203 and the S-PE equipment 206; T-PE equipment 203 is sent to S-PE equipment 206 with the Layer 2 data frame that AC202 transmits through PW205, and opposite end T-PE equipment 203 recovers or regenerate two layers of isl frame to be sent to opposite end AC202 again; Many PW205 can multiplexingly pass the T-PE equipment 203 toward the opposite end from T-PE equipment 203 in a P2MP PSN tunnel 204.
Realize that P2MP MS-PW and the difference that realizes P2MP SS-PW are; P2MP MS-PW is that segmentation is set up; That is: at first set up pseudo-line between source T-PE equipment to the S-PE equipment; At this moment, T-PE equipment is equivalent to the source PE equipment among the P2MP SS-PW, and S-PE equipment is equivalent to the leaf PE equipment among the P2MP SS-PW.Be specially: set up BGP between the source T-PE equipment on the specific P2MP PSN tunnel and the S-PE equipment and be connected; Be used for setting up the OPEN message that BGP connects and carry the indication information whether PE equipment supports the VPMS instance; Send the BGP message by source T-PE equipment to S-PE equipment, wherein carrying active T-PE equipment is the P2MP PW sign that specific VPMS instance is disposed.Set up the pseudo-line between each S-PE equipment to the leaf T-PE equipment then; At this moment; Each S-PE equipment is equivalent to the source PE equipment among the P2MP SS-PW, and leaf T-PE equipment is equivalent to the leaf PE equipment among the P2MP SS-PW, adopts and aforementioned identical method; By the mapping relations between the pseudo-line of pseudo-line in the relevant upper reaches of S-PE equipment disposition and downstream, can set up P2MP MS-PW then.
There are the situation of multistage S-PE equipment switching and single-stage S-PE equipment transit case shown in Figure 2 similar for the centre; With setting up P2MP SS-PW between one of them upstream node equipment of every grade and its downstream node equipment, and the mapping relations of the pseudo-line in the upper reaches that is attached thereto by the S-PE equipment disposition and downstream puppet line get final product.
The method of setting up P2MP MS-PW can realize cross operator, stride the P2MP PW in autonomous territory, makes things convenient between the different operators and cooperates.
In practical implementation; When certain leaf T-PE equipment or S-PE equipment become unactivated state; Can cancel the pseudo-line between the upstream node equipment that is attached thereto; Method among concrete grammar and the realization P2MP SS-PW is similar, when leaf T-PE equipment or leaf S-PE equipment become unactivated state, can send alarm informations such as NOTIFICATION message to T-PE equipment that directly links to each other with it or upper reaches S-PE equipment; Wherein carry various error codes (like timer expiry etc.), comprise error code, auxiliary error code and error message etc.Comprise the BGPUPDATE message of cancelling (withdraw) information and send equipment transmission to downstream node step by step by source T-PE equipment or Network Management Equipment generation then, until leaf T-PE equipment.
Can realize maintenance equally to P2MP MS-PW; For example: for leaf T-PE equipment being arranged when state of activation changes; Said leaf T-PE equipment upstream S-PE equipment sends BGP UPDATE message; Carry the state information of said leaf T-PE equipment in the said BGP UPDATE message, transmit step by step, until source T-PE equipment through S-PE equipment; Source T-PE equipment is according to the state information of said leaf T-PE equipment; S-PE equipment sends BGP UPDATE message downstream, carry in the said BGP UPDATE message said source S-PE devices allocation and said downstream S-PE equipment between P2MP PW label, upgrade P2MP PW; If said downstream S-PE equipment directly is connected with leaf T-PE equipment; Then said downstream S-PE equipment sends BGP UPDATE message to said leaf T-PE equipment, and carrying said S-PE equipment in the said BGP UPDATE message is the P2MP PW label of said leaf T-PE devices allocation, thereby upgrades the P2MP PW between said S-PE equipment and the said leaf T-PE equipment; If said downstream S-PE equipment is connected with leaf T-PE equipment through other S-PE equipment; Then send BGP UPDATE message to its direct-connected downstream S-PE equipment; Upgrade the P2MP PW between the two, the rest may be inferred, is updated to the P2MP PW that specific VPMS instance is set up step by step.
It is thus clear that, above-mentioned to the pseudo-line of P2MP MS-PW to cancel and safeguard be dynamically to accomplish, so efficient is higher, and can avoid the manual configuration mistake, improves the accuracy rate that realizes P2MP MS-PW, can reduce maintenance cost simultaneously.
More than the method that realizes P2MP in the embodiment of the invention is specified, below with reference to accompanying drawing, pairing system of said method and router device are elaborated.
With reference to Figure 12, be one structural representation of router in the embodiment of the invention, router one 200 comprises: the unit 1202 and first transmitting element 1203 are set up in information collection unit 1201, connection, wherein:
Connect and set up unit 1202, be used for setting up Border Gateway Protocol (BGP) with negotiation between the downstream node equipment and being connected according to the network topological information of collecting;
First transmitting element 1203 is used for after BGP connects foundation, and equipment sends the BGP message to downstream node, carries the point to multi-point pseudowire label of the special-purpose multicast service VPMS of promising particular virtual example allocation in the said BGP message, sets up point to multi-point pseudowire.
It is thus clear that, in the present embodiment, said router through with downstream node equipment between set up BGP and be connected after; Generate BGP UPDATE message and equipment transmission to downstream node; Carry the P2MP PW label that promising said specific VPMS srvice instance distributes in the said BGP UPDATE message, thereby can set up P2MP PW, because said method does not need static configuration; But dynamically set up, therefore can improve the efficient of setting up of P2MP PW; And, can improve configuration accuracy with respect to static configuration.
In practical implementation, can also expand above-mentioned router, below describe through specific embodiment.
With reference to Figure 13, be two structural representations of router in the embodiment of the invention, be that with router one difference router one 300 is expanded first receiving element 1301, information generating unit 1302 and second transmitting element 1303 on router one 200 bases, wherein:
First receiving element 1301 is used to receive the BGP notice NOTIFICATION message from downstream node equipment;
Wherein, revocation information is included as the point to multi-point pseudowire label of said VPMS example allocation.
Identical with router one, router two is set up point to multi-point pseudowire through dynamic process, so the efficient of this router is higher, and can avoid manual configuration to make mistakes, and improves accuracy rate.And, can realize dynamically cancelling of point to multi-point pseudowire, so router two can further improve efficient and the accuracy rate that realizes point to multi-point pseudowire.
On router one or router two bases, can also expand as follows, to accomplish the maintenance to the point to multi-point pseudowire of having set up, said maintenance does not need manual configuration, therefore can avoid makeing mistakes, and improves allocative efficiency and accuracy rate.
With reference to Figure 14; Be three structural representations of router in the embodiment of the invention, on router one 200 bases, to expand explanation, router one 400 is with the difference of router one 200; On router one 200 bases; Expansion has second receiving element, 1401, the first label distribution unit 1402 and the 3rd transmitting element 1403, wherein:
The first label distribution unit 1402 is used for when second receiving element 1401 receives said BGPUPDATE message, being specific VPMS example allocation point to multi-point pseudowire label;
The 3rd transmitting element 1403; Be used for sending BGP UPDATE message to said downstream node equipment; Carry the point to multi-point pseudowire label that the first label distribution unit 1402 distributes in the said BGP UPDATE message, the point to multi-point pseudowire between the downstream node equipment that renewal and said state of activation change.
Router three and through dynamically updating, can also be realized the maintenance of point to multi-point pseudowire except the foundation that can realize point to multi-point pseudowire and cancelling, therefore can improve maintenance efficiency and accuracy rate.
In above embodiment, said router can also carry out the maintenance of point to multi-point pseudowire according to the announcement information of Network Management Equipment, below describes with a concrete embodiment.
With reference to Figure 15, be four structural representations of router in the embodiment of the invention, router one 500 is expanded the 3rd receiving element 1501, the second label distribution unit 1502 and the 4th transmitting element 1503 on router one 200 bases, wherein:
The 3rd receiving element 1501 is used to receive the notice message of Network Management Equipment, carries the state information of the downstream node equipment after state of activation changes in the said notice message;
The second label distribution unit 1502 is used for when the 3rd receiving element 1501 receives the notice message of said Network Management Equipment, is specific VPMS example allocation point to multi-point pseudowire label;
The 4th transmitting element 1502; Be used for sending BGP UPDATE message to said downstream node equipment; Carry the point to multi-point pseudowire label that the second label distribution unit 1502 distributes in the said BGP UPDATE message, the point to multi-point pseudowire between the downstream node equipment that renewal and said state of activation change.
In practical implementation, said router goes for different application scenes, and for example, for putting the pseudo-line P2MP of multiple spot single hop SS-PW, above router is a source PE equipment, and downstream node equipment is leaf PE equipment; And for putting multiple spot multi-segment pseudo-wires P2MP MS-PW, above router can be source T-PE equipment, also can be S-PE equipment, and downstream node equipment is downstream S-PE equipment or leaf T-PE equipment.If said router is a S-PE equipment, also need be the mapping relations sign of pseudo-line in the upper reaches of distributing this S-PE equipment to connect and the pseudo-line in downstream.For a S-PE equipment independently, the pseudo-line in the upper reaches is the pseudo-line of point-to-point, and the pseudo-line in downstream is pseudo-line of point-to-point or point to multi-point pseudowire.
With reference to the accompanying drawings, introduce the system that realizes point to multi-point pseudowire in detail through specific embodiment.
With reference to Figure 16, for realizing system embodiment one structural representation of P2MP PW in the embodiment of the invention, this system comprises: first node equipment 1601 and Section Point equipment 1602, and Section Point equipment 1602 is downstream node equipment, wherein:
It is thus clear that, in the said system of present embodiment, first node equipment through with Section Point equipment between set up BGP and be connected after; Generate BGP UPDATE message and send to Section Point equipment; Carry the P2MP PW label that promising said specific VPMS srvice instance distributes in the said BGPUPDATE message, thereby can set up P2MP PW, because said system does not need static configuration; But dynamically set up, therefore can improve the efficient of setting up of P2MP PW; And, can improve configuration accuracy with respect to static configuration.
In practical implementation; Can also further expand said system; For example: first node equipment 1601; Also can be used for receiving BGP notice NOTIFICATION message, generate the bgp update UPDATE message that comprises revocation information, and send said BGP UPDATE message to Section Point equipment 1602 from Section Point equipment 1602; Cancel and Section Point equipment 1602 between the point to multi-point pseudowire set up, said revocation information comprises: be the P2MP PW label of specific VPMS example allocation; Corresponding; Section Point equipment 1602; Also can be used for sending the BGPNOTIFICATION message to first node equipment 1601; And receive from first node equipment 1601 comprise the BGP UPDATE message of said revocation information the time, cancel and first node equipment 1601 between the point to multi-point pseudowire set up.
Through above-mentioned expansion, said system can realize cancelling the point to multi-point pseudowire of having set up.Through realizing dynamically cancelling of point to multi-point pseudowire, said system can further improve efficient and the accuracy rate that realizes point to multi-point pseudowire.
In practical implementation,, can also expand as follows said system for carrying out system maintenance:
This system and through dynamically updating, can also realize the maintenance of point to multi-point pseudowire except the foundation that can realize point to multi-point pseudowire and cancelling, therefore can improve maintenance efficiency and accuracy rate.
In practical implementation, also can safeguard system, with reference to Figure 17 through Network Management Equipment; For realizing system embodiment two structural representations of P2MP PW in the embodiment of the invention; Be that with the difference of said system the said system of present embodiment also comprises Network Management Equipment 1701, wherein:
In practical implementation; The system of being introduced in the foregoing description goes for different application scenes, for example, and for putting the pseudo-line P2MP of multiple spot single hop SS-PW; First node equipment in the above system is source PE equipment, and Section Point equipment is leaf PE equipment; And for putting multiple spot multi-segment pseudo-wires P2MPMS-PW, first node equipment can be source T-PE equipment in the above system, also can be S-PE equipment, and Section Point equipment is downstream S-PE equipment or leaf T-PE equipment.If first node equipment is S-PE equipment, also need be the mapping relations sign of pseudo-line in the upper reaches of distributing this S-PE equipment to connect and the pseudo-line in downstream.For a S-PE equipment independently, the pseudo-line in the upper reaches is the pseudo-line of point-to-point, and the pseudo-line in downstream is pseudo-line of point-to-point or point to multi-point pseudowire.
One of ordinary skill in the art will appreciate that all or part of step in the whole bag of tricks of the foregoing description is to instruct relevant hardware to accomplish through program; This program can be stored in the computer-readable recording medium, and storage medium can comprise: ROM, RAM, disk or CD etc.
More than method, equipment and the system of the realization point to multi-point pseudowire that the embodiment of the invention provided carried out detailed introduction; Used concrete example among this paper principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that on embodiment and range of application, all can change, in sum, this description should not be construed as limitation of the present invention.
Claims (16)
1. a method that realizes point to multi-point pseudowire is characterized in that, comprising:
The source provider edge equipment is set up Border Gateway Protocol (BGP) with negotiation between the downstream node equipment and is connected according to the network topological information of collecting;
Source provider edge equipment equipment to downstream node sends the BGP message, carries the point to multi-point pseudowire label of the special-purpose multicast service VPMS of promising particular virtual example allocation in the said BGP message, sets up point to multi-point pseudowire.
2. the method for realization point to multi-point pseudowire as claimed in claim 1 is characterized in that, when said point to multi-point pseudowire arrived multiple spot single hop puppet line for point, said downstream node equipment was specially leaf Provider Edge PE equipment.
3. the method for realization point to multi-point pseudowire as claimed in claim 2 is characterized in that, further comprises:
When the source provider edge equipment receives from the BGP notice NOTIFICATION message of leaf PE equipment; Generation comprises the first bgp update UPDATE message of revocation information and sends to said leaf PE equipment; Cancel and said leaf PE equipment between the point to multi-point pseudowire set up, said revocation information comprises: be the P2MP PW label of specific VPMS example allocation.
4. the method for realization point to multi-point pseudowire as claimed in claim 2 is characterized in that, further comprises:
The 2nd BGP UPDATE message that source provider edge equipment reception is sent after changing from leaf PE device activation state carries the state information after leaf PE device activation state changes in said the 2nd BGP UPDATE message;
The source provider edge equipment sends the 3rd BGP UPDATE message to said leaf PE equipment; Carry the pseudo line tag of promising specific VPMS example allocation in said the 3rd BGP UPDATE message, the point to multi-point pseudowire between the leaf PE equipment that renewal and said state of activation change.
5. the method for realization point to multi-point pseudowire as claimed in claim 1; It is characterized in that; When said point to multi-point pseudowire arrived the multiple spot multi-segment pseudo-wires for point, said downstream node equipment was specially the pseudo-line transit point of leaf end points Provider Edge T-PE equipment or downstream S-PE equipment.
6. the method for realization point to multi-point pseudowire as claimed in claim 5; It is characterized in that; When said downstream node equipment is specially downstream S-PE equipment, further comprise: by the mapping relations sign of pseudo-line in the upper reaches of the said downstream of S-PE devices allocation, said downstream S-PE equipment connection and the pseudo-line in downstream.
7. the method for realization point to multi-point pseudowire as claimed in claim 6 is characterized in that, further comprises:
When the source provider edge equipment receives from the BGP NOTIFICATION message of leaf T-PE equipment or downstream S-PE equipment; Generation comprises a BGP UPDATE message of revocation information and sends to said leaf T-PE equipment or downstream S-PE equipment, cancel and said leaf T-PE equipment or downstream S-PE equipment between the point to multi-point pseudowire set up.
8. the implementation method of point to multi-point pseudowire as claimed in claim 6 is characterized in that, further comprises:
The source provider edge equipment receives the 2nd BGP UPDATE message that changes and afterwards send from leaf T-PE device activation state, carries the state information after said leaf T-PE device activation state changes in said the 2nd BGP UPDATE message;
The source provider edge equipment sends the 3rd BGP UPDATE message to the leaf T-PE equipment that said downstream S-PE equipment or state of activation change; Carry the pseudo line tag of promising specific VPMS example allocation in said the 3rd BGP UPDATE message, the point to multi-point pseudowire between the leaf T-PE equipment that renewal and downstream S-PE equipment or said state of activation change.
9. a router is characterized in that, comprising: the unit and first transmitting element are set up in information collection unit, connection, wherein:
Information collection unit is used for the collection network topology information;
Connect and set up the unit, be used for setting up Border Gateway Protocol (BGP) with negotiation between the downstream node equipment and being connected according to the network topological information of collecting;
First transmitting element is used for after BGP connects foundation, and equipment sends the BGP message to downstream node, carries the point to multi-point pseudowire label of the special-purpose multicast service VPMS of promising particular virtual example allocation in the said BGP message, sets up point to multi-point pseudowire.
10. router as claimed in claim 9 is characterized in that, further comprises: first receiving element, information generating unit and second transmitting element, wherein:
First receiving element is used to receive the BGP notice NOTIFICATION message from downstream node equipment;
Information generating unit is used for when receiving element receives said BGP NOTIFICATION message, generating the first bgp update UPDATE message that comprises revocation information, and said revocation information comprises: be the P2MP PW label of specific VPMS example allocation;
Second transmitting element is used to send the BGP UPDATE message that said information generating unit generates, cancel and said downstream node equipment between the point to multi-point pseudowire set up.
11. like claim 9 or 10 described routers, it is characterized in that, further comprise: second receiving element, the first label distribution unit and the 3rd transmitting element, wherein:
Second receiving element is used to receive the 2nd BGP UPDATE message that downstream node device activation state changes and afterwards sends, and carries the state information after said downstream node device activation state changes in said the 2nd BGP UPDATE message;
The first label distribution unit is used for when second receiving element receives said the 2nd BGP UPDATE message, being specific VPMS example allocation point to multi-point pseudowire label;
The 3rd transmitting element; Be used for sending the 3rd BGP UPDATE message to said downstream node equipment; Carry the point to multi-point pseudowire label that the first label distribution unit distributes in said the 3rd BGP UPDATE message, the point to multi-point pseudowire between the downstream node equipment that renewal and said state of activation change.
12. like claim 9 or 10 described routers, it is characterized in that, also comprise: the 3rd receiving element, the second label distribution unit and the 4th transmitting element, wherein:
The 3rd receiving element is used to receive the notice message of Network Management Equipment, carries the state information of the downstream node equipment after state of activation changes in the said notice message;
The second label distribution unit is used for when the 3rd receiving element receives the notice message of said Network Management Equipment, is specific VPMS example allocation point to multi-point pseudowire label;
The 4th transmitting element; Be used for sending the 4th BGP UPDATE message to said downstream node equipment; Carry the point to multi-point pseudowire label that the second label distribution unit distributes in said the 4th BGP UPDATE message, the point to multi-point pseudowire between the downstream node equipment that renewal and said state of activation change.
13. a system that realizes point to multi-point pseudowire is characterized in that, comprising: first node equipment and Section Point equipment, said Section Point equipment is downstream node equipment, wherein:
First node equipment comprises information collection unit, connects and set up the unit and first transmitting element, is used for the collection network topology information, and according to the network topological information of collecting, sets up Border Gateway Protocol (BGP) with negotiation between the said Section Point equipment and be connected; And after BGP connects foundation, send the BGP message to said Section Point equipment, and carry the point to multi-point pseudowire label of the special-purpose multicast service VPMS of promising particular virtual example allocation in the said BGP message, set up point to multi-point pseudowire;
Section Point equipment is used for the collection network topology information, according to the network topological information of collecting, sets up BGP with negotiation between the said first node equipment and is connected; Receive the BGP message that first node equipment sends, from said message, be retrieved as the point to multi-point pseudowire label of specific VPMS example allocation, the point to multi-point pseudowire between foundation and the first node equipment.
14. the system of realization point to multi-point pseudowire as claimed in claim 13; It is characterized in that; Said first node equipment; Also be used to receive BGP notice NOTIFICATION message, generate the first bgp update UPDATE message that comprises revocation information, and send a said BGP UPDATE message to said Section Point equipment from Section Point equipment; Cancel and said Section Point equipment between the point to multi-point pseudowire set up, said revocation information comprises: be the P2MP PW label of specific VPMS example allocation;
Section Point equipment; Also be used for sending BGP NOTIFICATION message to first node equipment; And receive from first node equipment comprise a BGP UPDATE message of said revocation information the time, cancel and said first node equipment between the point to multi-point pseudowire set up.
15. system like claim 13 or 14 described realization point to multi-point pseudowire; It is characterized in that; Said first node equipment; Also be used to receive the 2nd BGP UPDATE message that Section Point device activation state changes and afterwards sends, carry the state information of the Section Point equipment after said state of activation changes in said the 2nd BGP UPDATE message; Be specific VPMS example allocation point to multi-point pseudowire label; And send the 3rd BGP UPDATE message to said Section Point equipment; Carry the point to multi-point pseudowire label of said distribution in said the 3rd BGP UPDATE message, the point to multi-point pseudowire between the Section Point equipment that renewal and said state of activation change;
Said Section Point equipment also is used for when state of activation changes, sending the 2nd BGP UPDATE message to said first node equipment, carries the state information after this node device state of activation changes in said the 2nd BGP UPDATE message; When the 3rd BGP UPDATE message that receives from said first node equipment, obtain the point that distributed to the multiple spot label, upgrade and said first node equipment between point to multi-point pseudowire.
16. system like claim 13 or 14 described realization point to multi-point pseudowire; It is characterized in that; Also comprise: Network Management Equipment; Be used to receive the first notice message that Section Point device activation state changes and afterwards sends; Said first notice carries the change state information of back Section Point equipment of said state of activation in the message, and sends the second notice message to first node equipment, carries the state information after said Section Point device activation state changes in the said second notice message;
Said first node equipment; Also be used to receive the said second notice message from Network Management Equipment; Be specific VPMS example allocation point to multi-point pseudowire label; Send the 4th BGP UPDATE message to said Section Point equipment, carry the point to multi-point pseudowire label of said distribution in said the 4th BGP UPDATE message, the point to multi-point pseudowire between the Section Point equipment that renewal and said state of activation change;
Said Section Point equipment; Also be used for when state of activation changes, sending the first notice message to Network Management Equipment; Carry the state information after this node device state of activation changes in the said first notice message; When the 4th BGP UPDATE message that receives from said first node equipment, obtain the point that distributed to the multiple spot label, upgrade and said first node equipment between point to multi-point pseudowire.
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| CN105704029B (en) | 2010-01-15 | 2020-06-26 | 华为技术有限公司 | Pseudo wire establishing method, system and equipment |
| CN102148738A (en) | 2010-02-05 | 2011-08-10 | 华为技术有限公司 | Label distribution method, device and system for seamless multi-protocol label switching network |
| CN102238138A (en) * | 2010-04-23 | 2011-11-09 | 中兴通讯股份有限公司 | Pseudo wire service processing method and system |
| CN101873264B (en) * | 2010-06-09 | 2012-12-19 | 清华大学 | Method and device BGN for simulating functions of autonomous domain border router |
| CN101867503B (en) * | 2010-06-09 | 2012-12-26 | 清华大学 | Cross-domain BGP routing policy deployment method |
| CN102148748B (en) * | 2010-10-26 | 2014-05-21 | 华为技术有限公司 | Method and system for spreading pseudowire routing and sink node equipment |
| CN102143077B (en) * | 2011-03-29 | 2014-12-10 | 中兴通讯股份有限公司 | Method and system for realizing multi-service link of route equipment and route equipment thereof |
| CN102238057B (en) * | 2011-05-10 | 2013-07-24 | 福建星网锐捷网络有限公司 | Ethernet-tree realization method, system, device and network equipment |
| CN102394810A (en) * | 2011-10-14 | 2012-03-28 | 烽火通信科技股份有限公司 | Method for realizing dynamic association between pseudo-wire services and channels in PTN (Packet Transport Network) network |
| CN103188123B (en) * | 2011-12-30 | 2017-04-19 | 华为技术有限公司 | Method for realizing E-tree service and provider edge devices |
| CN102624618B (en) * | 2012-03-07 | 2017-06-30 | 南京中兴新软件有限责任公司 | The method and system of interface parameters in PWE3 signalings is obtained for exchanging PE |
| CN103368842A (en) * | 2012-04-10 | 2013-10-23 | 中兴通讯股份有限公司 | Method and system for establishing MS-PW |
| CN104518935B (en) * | 2013-09-27 | 2018-05-25 | 华为技术有限公司 | Realize the methods, devices and systems of virtual network communication |
| CN103491103B (en) * | 2013-09-30 | 2017-01-04 | 福建星网锐捷网络有限公司 | The method for building up of multi-segment pseudo-wires and system and device |
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| CN105791074A (en) * | 2014-12-25 | 2016-07-20 | 中兴通讯股份有限公司 | Method and device for establishing PW (Pseudo Wire) links |
| CN106470159B (en) * | 2015-08-18 | 2020-09-15 | 中兴通讯股份有限公司 | Tunnel convergence method and device |
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