CN102447611B - Method and system for establishing bidirectional point-to-multipoint label switched path as well as method and system for removing bidirectional point-to-multipoint label switched path - Google Patents

Method and system for establishing bidirectional point-to-multipoint label switched path as well as method and system for removing bidirectional point-to-multipoint label switched path Download PDF

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CN102447611B
CN102447611B CN201010507491.0A CN201010507491A CN102447611B CN 102447611 B CN102447611 B CN 102447611B CN 201010507491 A CN201010507491 A CN 201010507491A CN 102447611 B CN102447611 B CN 102447611B
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p2mp lsp
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CN102447611A (en
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陈然
金利忠
吴波
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ZTE Corp
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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]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
    • H04J3/0658—Clock or time synchronisation among packet nodes
    • 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
    • H04L45/16—Multipoint routing
    • 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]
    • H04L45/507—Label distribution

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

The invention discloses a method and a system for establishing a bidirectional point-to-multipoint label switched path as well as a method and a system for removing the bidirectional point-to-multipoint label switched path, wherein the establishing method is as follows: by starting from at least one bottom node of a bidirectional P2MP label switched path (LSP), the first label mapping information which carries a downlink label is sent to upstream nodes in a node-by-node way, and all the nodes build the downlink label switched table of the bidirectional P2MP LSP; and by starting from the root node of the bidirectional P2MP LSP, the second label mapping information which carries an uplink label is sent to downstream nodes which send the first label mapping information to the root node in the node-by-node way, all the nodes build the uplink label switched table of the bidirectional P2MP LSP, and the bidirectional P2MP LSP is set up. The method for establishing the bidirectional point-multipoint label switched path can solve the problems that the LSP in a multi-protocol label switching (MPLS) network has high management complexity and cannot be applied to the clock synchronization of institute of electrical and electronic engineers (IEEE) 1588v2. The invention also provides the method and the system for removing the built bidirectional point-to-multipoint label switched path.

Description

A kind ofly set up and remove bidirectional point to the method and system of multipoint label switched path
Technical field
The present invention relates to multiprotocol label switching (MPLS, Multi-Protocol Label Switching) point-to-multipoint label forwarding path (P2MP LSP in network, Point to Multiple Point LabelSwitchingPath) foundation and method for dismounting, particularly relate to a kind of method and system adopting tag distribution protocol (LDP, Label Distribution Protocol) to set up and remove point-to-multipoint label forwarding path.
Background technology
Along with developing rapidly of INVENTIONBroadcast video business, INVENTIONBroadcast video business starts to be carried on packet network, thus impels multicasting technology to be used widely.Due to the advantage of MPLS technology in traffic engineering, service quality, reliability etc., MPLS multicasting technology have also been obtained and develops rapidly, and carry out standardization in Internet Engineering Task group (IETF, The Internet Engineering Task Force).
Current MPLS multicasting technology mainly with point-to-multipoint (P2MP, Point to Multiple Point) label switched path (LSP, Label Switching Path) for main body, the multicast replication transmission characteristic of flow is provided.Unidirectional P2MP LSP provides an inlet edge equipment (Ingress PE, or be called root node) input of node flow, and multiple outlet PE (Egress PE, or be called leaf node) flow of node exports, and can the multicast transmission of guaranteed flow, namely each physical link only have a message to copy, in addition, owing to being that unidirectional LSP, P2MPLSP flow can only copy to leaf node from root node, can not from leaf node to root node.
At present, the transmitted in both directions that current mechanism will carry out message needs through different LSP, its way is as follows: leaf node is by the route information table of inquiry self, find the shortest path between self and root node, and this shortest path is increased to the return path between leaf node and root node, such return path be independent of leaf node to root node between a LSP or IP path, the physical pathway of its process is not identical to the physical pathway of leaf node with root node.
Therefore, PE not only needs the downlink path managing unidirectional P2MP LSP, also need to manage the return path of all leaf nodes to root node, for the MPLS multicasting technology that there is N (N is greater than 1) individual Egress PE node, management N+1 bar LSP may be needed, therefore, the management complexity of LSP can greatly be increased.
In addition, based on Institute of Electrical and Electric Engineers (IEEE, Institute of Electrical andElectronics Engineers) clock synchronous of 1588v2, when directly disposing IEEE 1588v2 in a network, because network can not provide QoS and Bandwidth guaranteed end to end to the transmission of IEEE 1588v2 clock message, in order to improve clock synchronization accuracy, IEEE 1588v2 clock synchronous adopts every synchronisation of nodes, each node is needed to support IEEE 1588v2, the cost of deployment facility in network can be increased, IEEE 1588v2 is at master clock and also can be fewer from the intermediate transmission node can crossed between clock, generally be less than 5 nodes.
The clock synchronous of IEEE1588v2, also needs to be realized by MPLS network.According to the clock synchronous principle of IEEE1588v2, require that the time delay of each node-node transmission message is consistent, specifically comprise: message trip path is identical, message bandwidth through path need to be guaranteed, the process in path needs reliable QoS and ensures, and need to utilize multicasting technology to carry out message transmissions, utilize with Optimizing Network Resources.
Due in existing MPLS network, when carrying out the transmitted in both directions of message, the path of process not identical, on the one hand, owing to there is more LSP, its Comparison of Management is complicated; On the other hand, the clock synchronous of IEEE1588v2 can not be met when message transmission, the requirement that message trip path is identical.
Summary of the invention
In view of this, the technical problem to be solved in the present invention is to provide a kind of method setting up two-way point-to-multipoint forward-path, can solve the management complexity of LSP in MPLS network high and can not be applied to the problem of clock synchronous of IEEE1588v2.
In order to solve the problem, the invention provides one and set up the method for bidirectional point to multipoint label switched path (P2MP LSP), in multiprotocol label switching (MPLS) network, adopt tag distribution protocol to set up two-way P2MP LSP, comprising:
From at least one leaf node of two-way P2MP LSP, put upstream nodes section by section and send the first label mapping message carrying downstream label, the downstream label that each node creates this two-way P2MP LSP is transmitted, thus sets up the downlink path from root node to leaf node of this two-way P2MP LSP;
From the root node of this two-way P2MP LSP, put section by section and send to transmission first label mapping message the second label mapping message carrying upstream label to the downstream node of this node, the upstream label that each node creates this two-way P2MP LSP is transmitted, thus sets up the up path from leaf node to root node of this two-way P2MP LSP;
Further, the up path of this two-way P2MP LSP is identical with the node of downlink path process.
Correspondingly, provided by the inventionly set up the system of bidirectional point to multipoint label switched path (P2MP LSP), comprise the root node of this two-way P2MP LSP, intermediate node and leaf node, each node adopts the first label mapping message of tag distribution protocol mutual, set up the downlink path of this two-way P2MP LSP, wherein:
Described root node is also for after the first label mapping message receiving downstream node transmission, for this two-way P2MP LSP distributes a upstream label, send the second label mapping message carrying this upstream label of this peer distribution to the downstream node of this node to transmission first label mapping message, and the upstream label creating this two-way P2MP LSP on this node be transmitted;
Described intermediate node is also for after receiving the second label mapping message, for this two-way P2MP LSP distributes a upstream label, send the second label mapping message carrying this upstream label of this peer distribution to the downstream node of this node to transmission first label mapping message, and the upstream label creating this two-way P2MPLSP on this node be transmitted;
Described leaf node is also for after receiving the second label mapping message, and the upstream label creating this two-way P2MP LSP on this node is transmitted.
Said method of the present invention and system adopt LDP agreement to set up the method for two-way P2MP LSP, a two-way P2MP LSP is set up between the root node and at least one leaf node of MPLS network, be made up of the descending P2MP path from root node to leaf node and the leaf node up path to root node, and the node of the up path process of P2MP LSP is identical with the node of its downlink path process, to make between root node and at least one leaf node can by set up the transmitted in both directions that the descending P2MP path of P2MP LSP and up path carry out message, and the point-to-multipoint message of transmitted in both directions path identical of process.Significantly reduce the management complexity to LSP, and the transmission of IEEE 1588v2 clock synchronous message can be carried out in an mpls network.
The technical problem to be solved in the present invention is to provide a kind of bidirectional point of removing to the method and system of multipoint label switched path (P2MP LSP), the two-way P2MP LSP established can be removed.
In order to solve the problems of the technologies described above, the present invention, in multiprotocol label switching (MPLS) network, adopts tag distribution protocol, removes at least part of up path of two-way P2MP LSP in the following manner:
The upstream label that the intermediate node that the leaf node to be removed of this two-way P2MP LSP and all downstream nodes are all removed empties this two-way P2MP LSP is transmitted, and upstream nodes sends the second label release message being used for up path and removing; The node receiving the second label release message during the upstream label of this two-way P2MPLSP is transmitted corresponding entry delete.
Simultaneously, the dismounting flow process of unidirectional P2MP LSP downlink path in tag distribution protocol can be adopted, between the upstream and downstream node of this two-way P2MP LSP by the label withdraw message that carries downstream label and the first label release message of removing for downlink path mutual, remove at least part of downlink path of this two-way P2MP LSP.
Correspondingly, present invention also offers the system of a kind of dismounting bidirectional point to multipoint label switched path (P2MPLSP), comprise the root node of this two-way P2MP LSP, intermediate node and leaf node, label withdraw message and first label release message of each node employing tag distribution protocol are mutual, remove the downlink path of this two-way P2MP LSP, wherein:
Described leaf node is also for when determining that this node needs to remove, and the upstream label emptying this two-way P2MP LSP on this node is transmitted, and upstream nodes sends the second label release message;
Described intermediate node is also for after receiving the second label release message, during from this node, the upstream label of this two-way P2MP LSP is transmitted, delete the forwarding entry relevant to the downstream node sending the second label release message, the forwarding entry transmitted as this upstream label is empty, then upstream nodes sends the second label release message;
Described root node, also for after receiving the second label release message, during the upstream label of this two-way P2MPLSP is transmitted from this node, deletes the forwarding entry relevant to the downstream node sending the second label release message.
According to said method of the present invention and system, LDP agreement can be adopted to be removed by the two-way P2MP LSP set up.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that the embodiment of the present invention one adopts exemplary a kind of network configuration of two-way P2MP LSP message transmission;
Fig. 2, for the embodiment of the present invention one is based on network shown in Fig. 1, adopts LDP agreement to set up the signalling diagram of an example of two-way P2MPLSP;
Fig. 3, for the embodiment of the present invention two is based on network shown in Fig. 2, adopts LDP agreement to remove the signalling diagram of an example of two-way P2MPLSP.
Embodiment
Hereinafter will be described in detail to embodiments of the invention by reference to the accompanying drawings.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.
Embodiment one
In an mpls network, the method adopting LDP agreement to set up two-way P2MP LSP comprises the present embodiment:
From at least one leaf node of two-way P2MP LSP, put upstream nodes section by section and send the first label mapping message carrying downstream label, the downstream label that each node creates this two-way P2MP LSP is transmitted, and sets up the downlink path from root node to leaf node of this two-way P2MP LSP;
From the root node of this two-way P2MP LSP, put the second label mapping message sending to downstream node and carry upstream label section by section, the upstream label that each node creates this two-way P2MP LSP is transmitted, and sets up the up path from leaf node to root node of this two-way P2MP LSP;
Further, the up path of this two-way P2MP LSP is identical with the node of downlink path process.
Wen Zhong, the label release message being used for downlink path dismounting sent to downstream node by certain node is called the first label release message, and the label release message being used for up path dismounting certain node upstream nodes sent is called the second label release message.
The foundation of the downlink path of above-mentioned two-way P2MP LSP can adopt the flow process of the downlink path (P2MP path) setting up unidirectional P2MP LSP in existing LDP agreement.But do not comprise the process of establishing of downlink path in existing procedure, need to expand LDP agreement.
The foundation of the up path of above-mentioned two-way P2MP LSP can be triggered by the foundation of downlink path, specifically can comprise the following steps:
After the root node of this two-way P2MP LSP receives the first label mapping message, for this two-way P2MPLSP distributes a upstream label, downstream node to transmission first label mapping message sends the second label mapping message carrying this upstream label of this peer distribution, and the upstream label creating this node is transmitted;
The intermediate node receiving the second label mapping message distributes a upstream label for this two-way P2MP LSP, send the second label mapping message carrying this upstream label of this peer distribution, and the upstream label creating this node is transmitted to described downstream node;
The upstream label that the leaf node receiving the second label mapping message creates this node is transmitted.
Wen Zhong, is called upstream label by the label being used for up path, and the label for downlink path is called downstream label, and upstream label and downstream label can be used for the foundation of respective paths, the forwarding etc. of message.Descending P2MP LSP forwarding equivalence class (FEC) can also be carried, for identifying the downlink path of this two-way P2MP LSP in above-mentioned first label mapping message; Up P2MP LSPFEC is also carried, for identifying the up path of this two-way P2MP LSP in second label mapping message.Up P2MP LSP FEC is different with descending P2MP LSP FEC.
After the downlink path of two-way P2MP LSP and up path have been set up, for the message of the user side transmission that root node receives, the downstream label of each this node of node checks is transmitted, along the downlink path of this two-way P2MPLSP by described message repeating to recipient; The message that the user side received for leaf node sends, the upstream label of each this node of node checks is transmitted, along the up path of this two-way P2MP LSP by described message repeating to recipient.To make between root node and at least one leaf node can by set up the transmitted in both directions that the downlink path of P2MP LSP and up path carry out message, and the point-to-multipoint message of transmitted in both directions path identical of process.Significantly reduce the management complexity to LSP, and the transmission of IEEE 1588v2 clock synchronous message can be carried out in an mpls network.
Correspondingly, the present embodiment sets up the system of bidirectional point to multipoint label switched path (P2MP LSP), comprise the root node of this two-way P2MP LSP, intermediate node and leaf node, each node adopts the first label mapping message of tag distribution protocol mutual, set up the downlink path of this two-way P2MP LSP, wherein:
Described root node is also for after the first label mapping message receiving downstream node transmission, for this two-way P2MP LSP distributes a upstream label, send the second label mapping message carrying this upstream label of this peer distribution to the downstream node of this node to transmission first label mapping message, and the upstream label creating this two-way P2MP LSP on this node be transmitted;
Described intermediate node is also for after receiving the second label mapping message, for this two-way P2MP LSP distributes a upstream label, send the second label mapping message carrying this upstream label of this peer distribution to the downstream node of this node to transmission first label mapping message, and the upstream label creating this two-way P2MPLSP on this node be transmitted;
Described leaf node is also for after receiving the second label mapping message, and the upstream label creating this two-way P2MP LSP on this node is transmitted.
Preferably, in said system,
The descending P2MP LSP forwarding equivalence class (FEC) of the downlink path for identifying this two-way P2MP LSP is also carried in the first label mapping message that described leaf node and intermediate node send;
Also carry the up P2MP LSP forwarding equivalence class of the up path for identifying this two-way P2MP LSP in the second label mapping message that described root node and intermediate node send, and described descending P2MPLSP forwarding equivalence class is different with up P2MP LSP forwarding equivalence class.
Preferably, in said system,
The intermediate node of this two-way P2MP LSP and root node first time receive the first label mapping message that a downstream node sends, as again received the first label mapping message that another downstream node sends, the downstream label then upgrading this two-way P2MP LSP on this node created is transmitted, and the second label mapping message of upstream node transmission is received at this section point, after this two-way P2MP LSP is assigned with upstream label, the second label mapping message carrying this upstream label of this peer distribution is sent to this another downstream node, and the upstream label of this two-way P2MP LSP is transmitted and is comprised and sent the relevant forwarding entry of all downstream nodes of the first label mapping message to this node before this on this node created or upgrade.
The practical application of such scheme is described by an example below.As shown in Figure 1, a root node LSR1 in MPLS network, will set up a two-way P2MP LSP between 1 intermediate node LSR2,2 leaf node LSR3 and LSR4, transmission belongs to the message of same business.On two-way P2MPLSP, from root to leaf, the forwarding in this direction is called and down forwards, and from leaf to root, the forwarding in this direction is called forwarded upstream.
The method that this example sets up two-way P2MP LSP is downstream distributing labels and sequential system.Because there is multiple leaf node in two-way P2MP LSP, and these leaf nodes are difficult to accomplish to send label mapping message simultaneously, so first hypothesis leaf node 2 initiates label mapping message, but when leaf node 3 initiates label mapping message is uncertain, can 1. 3. 4. 5. completing after any one step, this example hypothesis leaf node 3 is label mapping messages of initiation step is 1. after.
This example is transmitted by each node generating labels of LDP agreement in P2MP LSP, sets up the two-way P2MP LSP with descending P2MP path and the reverse path identical with downlink path, thus realizes message transmitted in both directions, specifically comprise the following steps:
Step one, leaf node is this two-way P2MPLSP allocation of downlink label, the downstream label creating this two-way P2MPLSP is transmitted, and upstream nodes sends the label mapping message carrying descending P2MP LSP FEC (FEC is forwarding equivalence class, unique identification LSP) and this downstream label;
As the step in Fig. 2 1. shown in, LSR3 sends to LSR2 and carries the label mapping message of descending P2MP LSP FEC and label L1; As the step in Fig. 2 2. shown in, LSR4 sends to LSR2 and carries the label mapping message of descending P2MP LSP FEC and label L2.
Step 2, intermediate node LSR2 checks whether the Downstream forwarding state of this two-way P2MP LSP, if had, forwards step 7 to, as not having, forwards step 3 to;
Certain node have the Downstream forwarding state of this two-way P2MP LSP to refer to the downstream label that this node exists this two-way P2MP LSP is transmitted, the upstream label that this node exists this two-way P2MP LSP is transmitted to have the Upstream forwarding state of this two-way P2MP LSP to refer to.After LSR2 receives the label mapping message of leaf node LSR3 transmission, should forward step 3 to, the downstream label creating this two-way P2MP LSP is transmitted.If receive the label mapping message that LSR4 sends afterwards, then forward step 7 to.
Step 3, intermediate node LSR2 distribute a downstream label L4 for this two-way P2MP LSP, the downstream label creating this two-way P2MP LSP at this node is transmitted, and continues to send to root node LSR1 to carry the label mapping message of descending P2MP LSP FEC and label L4, as Fig. 2 step 3. shown in;
The downstream label that LSR2 is formed is transmitted as shown in Figure 2, sets up Label Forwarding Information Base please refer to protocol contents according to label.
Step 4, after root node LSR1 receives the label mapping message of LSR2 transmission, check whether the Downstream forwarding state of this two-way P2MP LSP, if had, root node LSR1 upgrades downstream label and transmits, label L4 will be comprised, the forwarding entry of outgoing interface S3 joins during downstream label transmits, if do not had, root node LSR1 creates downstream label and transmits, forwarding entry after establishment is (user interface 1)-> <S3, L4>, as shown in Figure 2;
So far, the downlink path of this two-way P2MP LSP has been set up.
Step 5, after root node LSR1 receives the label mapping message of LSR2 transmission, check whether the Upstream forwarding state of this two-way P2MP LSP, if do not had, be then that this two-way P2MP LSP distributes upstream label L5, the upstream label creating this two-way P2MP LSP FEC at this node is transmitted, and sends carry the label mapping message of descending P2MP LSP FEC and label L5 to LSR2, as Fig. 2 step 4. shown in;
If root node also has other downstream node, after establishment upstream label is transmitted, the label mapping message that root node LSR1 sends as again received other downstream nodes, LSR1 can upgrade this upstream label and transmit, add corresponding forwarding entry, and send the label mapping message carrying descending P2MP LSPFEC and same label L5 to this downstream node.
Step 6, after LSR2 node receives the label mapping message of upstream node LSR1 transmission, this two-way P2MP LSP distributes upstream label L3 for this reason, the upstream label creating this two-way P2MP LSP at this node is transmitted, the label mapping message carrying descending P2MP LSP FEC and label L3 is sent to leaf node LSR3, as Fig. 2 step 5. shown in, after leaf node LSR3 receives this label mapping message, the upstream label creating this two-way P2MP LSP at this node is transmitted;
Step 7, the downstream label that LSR2 upgrades this two-way P2MP LSP is transmitted, add the forwarding entry relevant to the node sending label mapping message, receiving at LSR2 label mapping message that upstream node sends be after this two-way P2MP LSP distributes the upstream label L3 operation of the distribution upstream label L3 of LSR2 execution (namely in step 6), the label mapping message carrying descending P2MP LSP FEC and label L3 is sent to leaf node LSR4, as Fig. 2 step 6. shown in, after leaf node LSR4 receives this label mapping message, the upstream label creating this two-way P2MP LSP at this node is transmitted,
If namely the upstream label that LSR2 creates this two-way P2MP LSP has received the label mapping message that LSR4 sends before transmitting, then can add the forwarding entry relevant to LSR3 and LSR4 when creating this upstream label and transmitting, if also do not received, then after the label mapping message receiving LSR4 transmission, upgrade this upstream label set up to transmit, add the forwarding entry relevant to LSR4.
As can be seen from above-mentioned example, should the intermediate node of two-way P2MP LSP, receive the first label mapping message of a downstream node transmission in first time after, for this two-way P2MP LSP distributes a downstream label, the downstream label creating this two-way P2MP LSP on this node is transmitted, and upstream nodes sends the first label mapping message carrying this downstream label; Afterwards, after the second label mapping message receiving downstream node transmission, this intermediate node distributes a upstream label for this two-way P2MP LSP, the upstream label creating this two-way P2MP LSP on this node is transmitted, and sends the second label mapping message carrying this upstream label of this peer distribution to this downstream node;
When this intermediate node receives the first label mapping message of another downstream node transmission again, the downstream label upgrading this two-way P2MP LSP on this node is transmitted, add the forwarding entry relevant to this another downstream node, as now this intermediate node is transmitted for this two-way P2MP LSP is assigned with upstream label and creates upstream label, then in this upstream label is transmitted, add the forwarding entry relevant to this another downstream node, and the second label mapping message carrying this upstream label of this peer distribution is sent to this another downstream node, otherwise wait for that this intermediate node receives the label mapping message of upstream node transmission, after two-way P2MP LSP distribution upstream label, the upstream label created for this two-way P2MP LSP again adds in transmitting and sent the relevant forwarding entry of all downstream nodes of the first label mapping message to this node before this, and the second label mapping message carrying this upstream label of this peer distribution is sent to this another downstream node.
For the root node of this two-way P2MP LSP, after receiving the first label mapping message of a downstream node transmission for the first time, the downstream label creating this two-way P2MP LSP on this node is transmitted, and distribute a upstream label for this two-way P2MP LSP, the upstream label creating this two-way P2MP LSP on this node is transmitted, after this root node receives the first label mapping message of another downstream node transmission again, the downstream label upgrading this two-way P2MP LSP on this node is transmitted, add the forwarding entry relevant to this another downstream node, as now this root node is transmitted for this two-way P2MP LSP is assigned with upstream label and creates upstream label, then in this upstream label is transmitted, add the forwarding entry relevant to this another downstream node, and the second label mapping message carrying this upstream label of this peer distribution is sent to this another downstream node, otherwise wait for that this root node is after two-way P2MP LSP distributes upstream label, the upstream label created for this two-way P2MP LSP again adds in transmitting and sent the relevant forwarding entry of all downstream nodes of the first label mapping message to this node before this, and the second label mapping message carrying this upstream label of this peer distribution is sent to this another downstream node.
Due to the aggregation that intermediate node LSR2 is leaf node 2 and leaf node 3, so be identical for the upstream label of same two-way P2MP LSP distribution, LSR2 is label L3 to the upstream label that leaf node LSR3 and LSR4 distributes.
So far, in Fig. 2, the up path of two-way P2MP LSP has been set up, and each node all can have two kinds of Label Forwarding Information Base as shown in Figure 2.The process of establishing of two-way P2MP LSP above, also can be initiated by some leaf node.
When root node receives the message of user's transmitting terminal transmission by the user interface of self, and down forward table according to self, copy n part message, and encapsulate corresponding outgoing label (i.e. downstream label) respectively in copied each message after, be sent to respectively on n the intermediate node in self downstream by n the downstream interface of self.Each intermediate node receives message by the Upstream Interface of self, and transmit according to the downstream label of self, copy the message received by m part, after being replaced by the outgoing label in each message copied, be sent to m the leaf node in self downstream respectively by m the interface of self.Each leaf node receives message by the Upstream Interface of self, if encapsulate in received packet enter label transmit with self downstream label in this Upstream Interface corresponding to enter label identical, then received message is sent to user's receiving terminal by the user interface of self.
When the one or more nodes in m leaf node receive the message of user's transmitting terminal transmission by the user interface of self, upstream label according to self is transmitted, in received message, encapsulate outgoing label (i.e. upstream label), and be sent to the intermediate node of self upstream by the Upstream Interface of self; After the message that each intermediate node is sent to one or more leaf node by the interface of self, for any one message in received each message, if outgoing label packaged in this message is identical with outgoing label corresponding in intermediate node forwarded upstream table, then forward this message, and the outgoing label in this message is replaced to the outgoing label in the forwarded upstream table of intermediate node, the root node of self upstream is sent to by the Upstream Interface of self; Root node receives the message that described one or more intermediate node sends, for any a message wherein, if enter label and the root node upstream label that encapsulate in this message transmit that middle corresponding to enter label identical, then forward this message, be sent to user's receiving terminal by the user interface of root node self.
In the real process by two-way P2MP LSP message transmission, only can comprise the process along two-way P2MPLSP downlink path message transmission, also the process along two-way P2MP LSP up path message transmission can only be comprised, above-mentioned two processes can also be comprised simultaneously, specifically can make a return journey according to actual needs and determine.
The flow process of transmitted in both directions message in MPLS network in the present embodiment, can ensure message trip path the node of process identical, and downlink message transmission adopts multicasting technology to carry out.
Embodiment two
Embodiment one is set up the process of a two-way P2MP LSP by LDP agreement, and the present embodiment is then the process adopting LDP agreement to remove two-way P2MPLSP, wherein:
In multiprotocol label switching (MPLS) network, adopt tag distribution protocol, remove the flow process of at least part of downlink path of two-way P2MPLSP, can be identical to the dismounting flow process of unidirectional P2MPLSP downlink path with existing tag distribution protocol, label withdraw message and the first label release message by carrying downstream label between the node of upstream and downstream are mutual.
In multiprotocol label switching (MPLS) network, adopt tag distribution protocol, remove at least part of up path of two-way P2MP LSP in the following manner:
The upstream label that the intermediate node that the leaf node to be removed of this two-way P2MP LSP and all downstream nodes are all removed empties this two-way P2MP LSP is transmitted, and upstream nodes sends the second label release message being used for up path and removing; The node receiving the second label release message during the upstream label of this two-way P2MPLSP is transmitted corresponding entry delete.
At least part of up path of this two-way P2MP LSP of above-mentioned dismounting specifically can comprise:
The upstream label that this two-way P2MP LSP leaf node to be removed empties this two-way P2MP LSP on this node is transmitted, and upstream nodes sends the second label release message;
During the upstream label receiving intermediate node this two-way P2MP LSP from this node of the second label release message is transmitted, delete the forwarding entry relevant to the downstream node sending the second label release message, the forwarding entry transmitted as this upstream label is empty, then upstream nodes sends the second label release message;
After the root node of this two-way P2MP LSP receives the second label release message, during the upstream label of this two-way P2MP LSP is transmitted from this node, delete the forwarding entry relevant with the downstream node of transmission the second label release message.
Carry up P2MP LSP forwarding equivalence class (FEC) in above-mentioned second label release message, this up P2MP LSP forwarding equivalence class is different with the descending P2MP LSP forwarding equivalence class carried in the first label release message removed for downlink path.According to the up P2MP LSP forwarding equivalence class in label release message or descending P2MP LSP forwarding equivalence class, the root node of this two-way P2MP LSP and intermediate node can determine that the upstream label of two-way P2MP LSP is transmitted or downstream label is transmitted, determine the entry that will delete according to the node sending label release message.
Be still the practical application that example illustrates the present embodiment such scheme by the MPLS network shown in Fig. 1 below, referring to Fig. 3, the process that this employing LDP agreement removes two-way P2MP LSP specifically comprises the following steps:
Step one, leaf node upstream nodes LSR2 to be removed sends the label withdraw message carrying descending P2MP LSPFEC and downstream label, and carries the label release message of up P2MP LSP FEC.
As shown in Figure 3, LSR3 finds that this node has not been the leaf node of two-way P2MP LSP, then upstream nodes LSR2 sends the label withdraw message carrying descending P2MP LSP FEC and label L1, and carries the label release message of up P2MP LSP FEC;
LSR4 finds that this node has not been the leaf node of two-way P2MP LSP, then upstream nodes LSR2 sends the label withdraw message carrying descending P2MP LSP FEC and label L2, and carries the label release message of up P2MP LSP FEC.
Step 2, LSR2 transmits from the downstream label of this two-way P2MP LSP the forwarding entry that middle deletion comprises label L1 and L2, and respond label release message to leaf node LSR3 and LSR4, transmitting middle deletion from the upstream label of this two-way P2MP LSP comprises label L3 simultaneously, incoming interface is S1, and label L3, incoming interface is the forwarding entry of S0;
As shown in Figure 3, LSR2 transmits middle deletion from the downstream label of this two-way P2MPLSP and comprises label L1, the entry of outgoing interface S1 after receiving the label withdraw message of LSR3 transmission, responds label release message to leaf node LSR3; LSR2 transmits middle deletion from upstream label and comprises label L3, the forwarding entry of incoming interface S1 after receiving the label release message of LSR3 transmission.
LSR2 from receive LSR4 send label withdraw message after, transmit middle deletion from the downstream label of this two-way P2MPLSP and comprise label L2, the entry of outgoing interface S0, respond label release message to leaf node LSR4, after LSR2 receives the label release message of LSR4 transmission, transmit middle deletion from upstream label and comprise label L3, the forwarding entry of incoming interface S0.
Step 3, if LSR2 also has downstream node, upstream label is transmitted and downstream label is transmitted and is not cleared, any label withdraw message and label release message can not be sent to root node 1, if LSR2 is without downstream node, then the upstream label of this two-way P2MP LSP is transmitted to transmit with downstream label and is cleared, and proceeds to step 4;
As shown in Figure 3, after the label withdraw message receiving LSR3 as LSR2 and label release message, because LSR4 is still effective downstream node, LSR2 does not send label withdraw message and label release message to LSR1.After the label withdraw message again receiving LSR4 as LSR2 and label release message, because LSR4 is last leaf node of LSR2, the upstream label of the two-way P2MP LSP of LSR2 is transmitted to transmit with downstream label and is cleared.
Step 4, LSR2 sends and carries the label withdraw message of descending P2MP LSP FEC and label L4, and the label release message carrying this up P2MP LSP FEC is to root node LSR1;
Step 5, LSR1 transmits middle deletion from the downstream label of this two-way P2MP LSP and comprises label L4, the forwarding entry of outgoing interface S3, and reply label release message to LSR2 after receiving the label withdraw message of LSR2 transmission; LSR1 transmits middle deletion from the upstream label of this two-way P2MP LSP and comprises label L5, the forwarding entry of incoming interface S3 after receiving the label release message of LSR2 transmission from incoming interface S3.
By this process, the label removal process of whole two-way P2MP LSP completes, but said process is not to perform, and such as, time iff one of them leaf of dismounting, only needs to perform step one to three.
The all or part of step that one of ordinary skill in the art will appreciate that in said method is carried out instruction related hardware by program and is completed, and described program can be stored in computer-readable recording medium, as read-only memory, disk or CD etc.Alternatively, all or part of step of above-described embodiment also can use one or more integrated circuit to realize, and correspondingly, each module/unit in above-described embodiment can adopt the form of hardware to realize, and the form of software function module also can be adopted to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (12)

1. set up the method for bidirectional point to multipoint label switched path P2MP LSP, in multiprotocol label switching MPLS network, adopt tag distribution protocol to set up two-way P2MP LSP, comprising:
From at least one leaf node of two-way P2MP LSP, put upstream nodes section by section and send the first label mapping message carrying downstream label, the downstream label that each node creates this two-way P2MP LSP is transmitted, thus sets up the downlink path from root node to leaf node of this two-way P2MP LSP;
From the root node of this two-way P2MP LSP, put section by section and send to transmission first label mapping message the second label mapping message carrying upstream label to the downstream node of this node, the upstream label that each node creates this two-way P2MP LSP is transmitted, thus sets up the up path from leaf node to root node of this two-way P2MP LSP;
Further, the up path of this two-way P2MP LSP is identical with the node of downlink path process;
The descending P2MP LSP forwarding equivalence class FEC of the downlink path for identifying this two-way P2MP LSP is also carried in described first label mapping message, also carry the up P2MP LSP forwarding equivalence class of the up path for identifying this two-way P2MP LSP in described second label mapping message, described descending P2MP LSP forwarding equivalence class is different with up P2MP LSP forwarding equivalence class.
2. the method for claim 1, is characterized in that, the described up path setting up this two-way P2MP LSP specifically comprises:
After the root node of this two-way P2MP LSP receives the first label mapping message, for this two-way P2MPLSP distributes a upstream label, the upstream label creating this two-way P2MP LSP on this node is transmitted, and sends the second label mapping message carrying this upstream label of this peer distribution to the downstream node of this node to transmission first label mapping message;
The intermediate node receiving the second label mapping message distributes a upstream label for this two-way P2MP LSP, the upstream label creating this two-way P2MP LSP on this node is transmitted, and sends the second label mapping message carrying this upstream label of this peer distribution to the downstream node of this node to transmission first label mapping message;
The upstream label that the leaf node receiving the second label mapping message creates this two-way P2MP LSP on this node is transmitted.
3. method as claimed in claim 1 or 2, is characterized in that:
The root node of this two-way P2MP LSP and intermediate node send second label mapping message to each downstream node of this node, and carry identical upstream label to the second label mapping message that the downstream node that this node is all sends.
4. method as claimed in claim 2, is characterized in that:
The intermediate node of this two-way P2MP LSP and root node first time receive the first label mapping message that a downstream node sends, as again received the first label mapping message that another downstream node sends, the downstream label then upgrading this two-way P2MP LSP on this node created is transmitted, and the second label mapping message of upstream node transmission is received at this section point, after this two-way P2MP LSP is assigned with upstream label, the second label mapping message carrying this upstream label of this peer distribution is sent to this another downstream node, and the upstream label of this two-way P2MP LSP is transmitted and is comprised and sent the relevant forwarding entry of all downstream nodes of the first label mapping message to this node before this on this node created or upgrade.
5. method as claimed in claim 1 or 2, is characterized in that:
After the downlink path of this two-way P2MP LSP and up path have been set up, for the message of user's transmitting terminal transmission that root node receives, the downstream label of each this node of node checks is transmitted, along the downlink path of this two-way P2MP LSP by described message repeating to user's receiving terminal;
The message that the user's transmitting terminal received for leaf node sends, the upstream label of each this node of node checks is transmitted, along the up path of this two-way P2MP LSP by described message repeating to user's receiving terminal.
6. remove a method for up path in bidirectional point to multipoint label switched path P2MP LSP, comprising:
In multiprotocol label switching (MPLS) network, adopt tag distribution protocol, remove at least part of up path of two-way P2MP LSP in the following manner:
The upstream label that the intermediate node that the leaf node to be removed of this two-way P2MP LSP and all downstream nodes are all removed empties this two-way P2MP LSP is transmitted, and upstream nodes sends the second label release message being used for up path and removing; The node receiving the second label release message during the upstream label of this two-way P2MPLSP is transmitted corresponding entry delete;
Wherein, the up P2MP LSP forwarding equivalence class FEC of the up path for identifying this two-way P2MP LSP is carried in described second label release message.
7. method as claimed in claim 6, it is characterized in that, at least part of up path of this two-way P2MP LSP of described dismounting specifically comprises:
The upstream label that this two-way P2MP LSP leaf node to be removed empties this two-way P2MP LSP on this node is transmitted, and upstream nodes sends the second label release message;
During the upstream label receiving intermediate node this two-way P2MP LSP from this node of the second label release message is transmitted, delete the forwarding entry relevant with the downstream node of transmission the second label release message; The forwarding entry transmitted as this upstream label is empty, then upstream nodes sends the second label release message;
After the root node of this two-way P2MP LSP receives the second label release message, during the upstream label of this two-way P2MP LSP is transmitted from this node, delete the forwarding entry relevant with the downstream node of transmission the second label release message.
8. method as claimed in claims 6 or 7, is characterized in that, also comprise:
In described multiprotocol label switching MPLS network, adopt the dismounting flow process of unidirectional P2MPLSP downlink path in tag distribution protocol, between the upstream and downstream node of this two-way P2MP LSP by the label withdraw message that carries downstream label and the first label release message of removing for downlink path mutual, remove at least part of downlink path of this two-way P2MP LSP.
9. method as claimed in claim 8, is characterized in that:
Carry the descending P2MP LSP forwarding equivalence class of the downlink path for identifying this two-way P2MP LSP in described first label release message, described up P2MP LSP forwarding equivalence class is different with descending P2MPLSP forwarding equivalence class.
10. set up the system of bidirectional point to multipoint label switched path P2MP LSP for one kind, comprise the root node of this two-way P2MP LSP, intermediate node and leaf node, each node adopts the first label mapping message of tag distribution protocol mutual, set up the downlink path of this two-way P2MP LSP, it is characterized in that:
Described root node is also for after the first label mapping message receiving downstream node transmission, for this two-way P2MP LSP distributes a upstream label, send the second label mapping message carrying this upstream label of this peer distribution to the downstream node of this node to transmission first label mapping message, and the upstream label creating this two-way P2MP LSP on this node be transmitted;
Described intermediate node is also for after receiving the second label mapping message, for this two-way P2MP LSP distributes a upstream label, send the second label mapping message carrying this upstream label of this peer distribution to the downstream node of this node to transmission first label mapping message, and the upstream label creating this two-way P2MPLSP on this node be transmitted;
Described leaf node is also for after receiving the second label mapping message, and the upstream label creating this two-way P2MP LSP on this node is transmitted;
The two-way P2MP LSP up path set up between described root node with described leaf node is identical with the node of downlink path process;
The descending P2MP LSP forwarding equivalence class FEC of the downlink path for identifying this two-way P2MP LSP is also carried in the first label mapping message that described leaf node and intermediate node send;
Also carry the up P2MP LSP forwarding equivalence class of the up path for identifying this two-way P2MP LSP in the second label mapping message that described root node and intermediate node send, and described descending P2MPLSP forwarding equivalence class is different with up P2MP LSP forwarding equivalence class.
11. systems as claimed in claim 10, is characterized in that:
The intermediate node of this two-way P2MP LSP and root node first time receive the first label mapping message that a downstream node sends, as again received the first label mapping message that another downstream node sends, the downstream label then upgrading this two-way P2MP LSP on this node created is transmitted, and the second label mapping message of upstream node transmission is received at this section point, after this two-way P2MP LSP is assigned with upstream label, the forwarding entry relevant to this another downstream node is added when the upstream label created or upgrade this two-way P2MP LSP on this node is transmitted, the second label mapping message carrying this upstream label of this peer distribution is sent to this another downstream node.
Remove the system of bidirectional point to multipoint label switched path P2MP LSP for 12. 1 kinds, comprise the root node of this two-way P2MP LSP, intermediate node and leaf node, label withdraw message and first label release message of each node employing tag distribution protocol are mutual, remove the downlink path of this two-way P2MP LSP, it is characterized in that:
Described leaf node is also for when determining that this node needs to remove, and the upstream label emptying this two-way P2MP LSP on this node is transmitted, and upstream nodes sends the second label release message;
Described intermediate node is also for after receiving the second label release message, during from this node, the upstream label of this two-way P2MP LSP is transmitted, delete the forwarding entry relevant to the downstream node sending the second label release message, the forwarding entry transmitted as this upstream label is empty, then upstream nodes sends the second label release message;
Described root node, also for after receiving the second label release message, during the upstream label of this two-way P2MPLSP is transmitted from this node, deletes the forwarding entry relevant to the downstream node sending the second label release message;
The up P2MP LSP forwarding equivalence class FEC of the up path for identifying this two-way P2MP LSP is carried in the second label release message that described leaf node and intermediate node send;
Carry the descending P2MP LSP forwarding equivalence class of the downlink path for identifying this two-way P2MP LSP in the first label release message that described leaf node and intermediate node send, described up P2M LSP forwarding equivalence class is different with descending P2MP LSP forwarding equivalence class.
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