CN102447611A - 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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CN102447611A
CN102447611A CN2010105074910A CN201010507491A CN102447611A CN 102447611 A CN102447611 A CN 102447611A CN 2010105074910 A CN2010105074910 A CN 2010105074910A CN 201010507491 A CN201010507491 A CN 201010507491A CN 102447611 A CN102447611 A CN 102447611A
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p2mp lsp
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CN102447611B (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)
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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 of method and system of setting up and removing two-way point to the multiple spot label forwarding path
Technical field
The present invention relates to multiprotocol label switching (MPLS; Multi-Protocol Label Switching) point in the network is to multiple spot label forwarding path (P2MP LSP; Point to Multiple Point LabelSwitchingPath) foundation and method for dismounting; Relate in particular to a kind of employing tag distribution protocol (LDP, Label Distribution Protocol) and set up and remove the method and system of point to the multiple spot label forwarding path.
Background technology
Along with professional the developing rapidly of broadcast video, the broadcast video business begins to be carried on packet network, thereby impels multicasting technology to be used widely.Because the MPLS technology is in the advantage of aspects such as traffic engineering, service quality, reliability; The MPLS multicasting technology has also obtained developing rapidly; And the engineering duty group in the Internet (IETF, The Internet Engineering Task Force) has been carried out standardization.
Current MPLS multicasting technology is a main body to put multiple spot (P2MP, Point to Multiple Point) label switched path (LSP, Label Switching Path) mainly, and the multicast replication transmission characteristic of flow is provided.Unidirectional P2MP LSP provides the input of an ingress edge equipment (Ingress PE, or be called root node) node flow, and a plurality of outlet PE (Egress PE; Or be called leaf node) the flow output of node, and multicast transmission that can dependable flow, promptly have only a message to duplicate on each bar physical link; In addition; Owing to be unidirectional LSP, the P2MPLSP flow can only copy to leaf node from root node, can not be from the leaf node to the root node.
At present; Current mechanism will be carried out the transmitted in both directions of message need pass through different LSP; Its way is following: leaf node is through self route information table of inquiry, finds the shortest path between self and the root node, and this shortest path is increased to the return path between leaf node and the root node; Such return path is to be independent of leaf node to LSP between the root node or IP path, and the physical pathway of its process and root node are inequality to the physical pathway of leaf node.
Therefore; PE not only need manage the downlink path of unidirectional P2MP LSP; Also need manage the return path of all leaf nodes,, may need management N+1 bar LSP for the MPLS multicasting technology that has the individual Egress PE of N (N is greater than 1) node to root node; Therefore, can increase the management complexity of LSP greatly.
In addition, based on the clock synchronization of Institute of Electrical and Electric Engineers (IEEE, Institute of Electrical andElectronics Engineers) 1588v2; When directly in network, disposing IEEE 1588v2; Transmission can not provide QoS and bandwidth guarantee end to end because network is to IEEE 1588v2 clock message, and in order to improve clock synchronization accuracy, IEEE 1588v2 clock synchronization adopts every node synchronous; Need each node all to support IEEE 1588v2; Can increase the cost of deployment facility in the network, IEEE 1588v2 generally is less than 5 nodes at master clock and also can be fewer from the intermediate transmission node that can cross between the clock.
The clock synchronization of IEEE1588v2 also need realize through the MPLS network.Clock synchronization principle according to IEEE1588v2; Require the time-delay of each node message transmission consistent; Specifically comprise: the message trip path is identical, message need be guaranteed through the bandwidth in path, the processing in path needs reliable QoS and guarantees; And need utilize multicasting technology to carry out message transmissions, with the optimize network resources utilization.
Because in the existing MPLS network, when carrying out the transmitted in both directions of message, the path of process inequality, on the one hand, owing to there is more LSP, it manages more complicated; On the other hand, the clock synchronization that can not satisfy IEEE1588v2 when message transmission, the requirement that the message trip path is identical.
Summary of the invention
In view of this, the technical problem that the present invention will solve provides a kind of method of setting up two-way point to the multiple spot forward-path, can solve the management complexity height of LSP in the MPLS network and the problem that can not be applied to the clock synchronization of IEEE1588v2.
In order to address the above problem, the invention provides a kind of method of setting up two-way point to multiple spot label forwarding path (P2MP LSP), in the multiprotocol label switching (mpls) network, adopt tag distribution protocol to set up two-way P2MP LSP, comprising:
Begin from least one leaf node of two-way P2MP LSP; Send first label mapping message that carries descending label by the node upstream nodes; Each node is created the descending Label Forwarding Information Base of this two-way P2MP LSP, thereby sets up the downlink path from the root node to the leaf node of this two-way P2MP LSP;
Begin from the root node of this two-way P2MP LSP; Carry second label mapping message of upstream label for the downstream node transmission of this node by node to sending first label mapping message; Each node is created the upstream label of this two-way P2MP LSP and is transmitted, thereby sets up the up path from the leaf node to the root node of this two-way P2MP LSP;
And the up path of this two-way P2MP LSP is identical with the node of downlink path process.
Correspondingly; The system that sets up two-way point to multiple spot label forwarding path (P2MP LSP) provided by the invention; The root node, intermediate node and the leaf node that comprise this two-way P2MP LSP; Each node adopts first label mapping message of tag distribution protocol mutual, sets up the downlink path of this two-way P2MP LSP, wherein:
Said root node also is used for after receiving first label mapping message that downstream node sends; For this two-way P2MP LSP distributes a upstream label; Send for the downstream node of this node to carry second label mapping message of this upstream label that this node distributes to sending first label mapping message, and the upstream label of creating this two-way P2MP LSP on this node is transmitted;
Said intermediate node also is used for after receiving second label mapping message; For this two-way P2MP LSP distributes a upstream label; Send for the downstream node of this node to carry second label mapping message of this upstream label that this node distributes to sending first label mapping message, and create on this node the upstream label of this two-way P2MPLSP and transmit;
Said leaf node also is used for after receiving second label mapping message, creates the upstream label of this two-way P2MP LSP on this node and transmits.
Said method of the present invention and system adopt the LDP agreement to set up the method for two-way P2MP LSP; Between the root node of MPLS network and at least one leaf node, set up a two-way P2MP LSP; Form to the up path of root node by descending P2MP path from the root node to the leaf node and leaf node; And the node of the up path process of P2MP LSP is identical with the node of its downlink path process; Make and can pass through the descending P2MP path of the P2MP LSP that sets up and the transmitted in both directions that up path carries out message between root node and at least one leaf node, and transmitted in both directions put the multiple spot message path identical of process.Reduced management complexity effectively, and can in the MPLS network, carry out the transmission of IEEE 1588v2 clock synchronization message LSP.
The technical problem that the present invention will solve provides the method and system of the two-way point of a kind of dismounting to multiple spot label forwarding path (P2MP LSP), can remove setting up good two-way P2MP LSP.
In order to solve the problems of the technologies described above, the present invention adopts tag distribution protocol in the multiprotocol label switching (mpls) network, remove the up path of part at least of two-way P2MP LSP by following mode:
The waiting of this two-way P2MP LSP removed the upstream label that intermediate node that leaf node and all downstream nodes all are removed empties this two-way P2MP LSP and transmitted, and upstream nodes is sent and is used for second label release message that up path is removed; Receive upstream label that the node of second label release message will this two-way P2MPLSP transmit in corresponding clauses and subclauses deletion.
Simultaneously; Can adopt the dismounting flow process of unidirectional P2MP LSP downlink path in the tag distribution protocol; It is mutual with first label release message that is used for the downlink path dismounting to cancel message through the label that carries descending label between the upstream and downstream node of this two-way P2MP LSP, the downlink path of part at least of removing this two-way P2MP LSP.
Correspondingly; The present invention also provides the system of the two-way point of a kind of dismounting to multiple spot label forwarding path (P2MPLSP); The root node, intermediate node and the leaf node that comprise this two-way P2MP LSP; Each node adopts the label of tag distribution protocol to cancel message and first label release message is mutual, removes the downlink path of this two-way P2MP LSP, wherein:
Said leaf node also is used for when definite this node need be removed, and the upstream label that empties this two-way P2MP LSP on this node is transmitted, and upstream nodes is sent second label release message;
Said intermediate node also is used for after receiving second label release message; From the upstream label of this two-way P2MP LSP of this node is transmitted; Deletion and the relevant forwarding entry of downstream node that sends second label release message; Forwarding entry as this upstream label is transmitted is empty, and upstream nodes is sent second label release message again;
Said root node also is used for after receiving second label release message, from the upstream label of this two-way P2MPLSP of this node is transmitted, and deletion and the relevant forwarding entry of downstream node that sends second label release message.
According to said method of the present invention and system, the two-way P2MP LSP that can adopt the LDP agreement will set up completion removes.
Description of drawings
Fig. 1 is the sketch map that the embodiment of the invention one adopts exemplary a kind of network configuration of two-way P2MP LSP message transmission;
Fig. 2 be the embodiment of the invention one based on network shown in Figure 1, adopt the LDP agreement to set up the signalling diagram of the example of two-way P2MPLSP;
Fig. 3 be the embodiment of the invention two based on network shown in Figure 2, adopt the LDP agreement to remove the signalling diagram of the example of two-way P2MPLSP.
Embodiment
Hereinafter will combine accompanying drawing that embodiments of the invention are elaborated.Need to prove that under the situation of not conflicting, embodiment and the characteristic among the embodiment among the application can make up each other.
Embodiment one
Present embodiment is in the MPLS network, and the method that adopts the LDP agreement to set up two-way P2MP LSP comprises:
Begin from least one leaf node of two-way P2MP LSP; Send first label mapping message that carries descending label by the node upstream nodes; Each node is created the descending Label Forwarding Information Base of this two-way P2MP LSP, sets up the downlink path from the root node to the leaf node of this two-way P2MP LSP;
Begin from the root node of this two-way P2MP LSP; Send second label mapping message that carries upstream label to downstream node by node; Each node is created the upstream label of this two-way P2MP LSP and is transmitted, and sets up the up path from the leaf node to the root node of this two-way P2MP LSP;
And the up path of this two-way P2MP LSP is identical with the node of downlink path process.
In the literary composition, the label release message that is used for the downlink path dismounting that certain node is sent to downstream node is called first label release message, and the label release message that is used for the up path dismounting that certain node upstream nodes is sent is called second label release message.
The foundation of the downlink path of above-mentioned two-way P2MP LSP can be adopted the flow process of setting up the downlink path (P2MP path) of unidirectional P2MP LSP in the existing LDP agreement.But the process of setting up that does not comprise downlink path in the existing procedure need be expanded the 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 may further comprise the steps:
After the root node of this two-way P2MP LSP is received first label mapping message; For this two-way P2MPLSP distributes a upstream label; Send second label mapping message that carries this upstream label that this node distributes to the downstream node that sends first label mapping message, and the upstream label of creating this node is transmitted;
The intermediate node of receiving second label mapping message distributes a upstream label for this two-way P2MP LSP, sends second label mapping message that carries this upstream label that this node distributes to said downstream node, and the upstream label of creating this node is transmitted;
The leaf node of receiving second label mapping message is created the upstream label of this node and is transmitted.
In the literary composition, the label that will be used for up path is called upstream label, and the label that is used for downlink path is called descending label, and upstream label and descending label can be used for foundation, message forwarding of respective paths etc.Can also carry descending P2MP LSP forwarding equivalence class (FEC) in above-mentioned first label mapping message, be used to identify the downlink path of this two-way P2MP LSP; Also carry up P2MP LSPFEC in second label mapping message, be used to identify the up path of this two-way P2MP LSP.Up P2MP LSP FEC is different with descending P2MP LSP FEC.
After the downlink path and up path foundation completion of two-way P2MP LSP; The message that the user side of receiving for root node sends; Each node is searched the descending Label Forwarding Information Base of this node, and the downlink path of this two-way P2MPLSP of edge is transmitted to the recipient with said message; The message that the user side of receiving for leaf node sends, each node is searched the upstream label of this node and is transmitted, and the up path of this two-way P2MP LSP of edge is transmitted to the recipient with said message.Make and can pass through the downlink path of the P2MP LSP that sets up and the transmitted in both directions that up path carries out message between root node and at least one leaf node, and transmitted in both directions put the multiple spot message path identical of process.Reduced management complexity effectively, and can in the MPLS network, carry out the transmission of IEEE 1588v2 clock synchronization message LSP.
Correspondingly; Present embodiment is set up the system of two-way point to multiple spot label forwarding path (P2MP LSP); The root node, intermediate node and the leaf node that comprise this two-way P2MP LSP; Each node adopts first label mapping message of tag distribution protocol mutual, sets up the downlink path of this two-way P2MP LSP, wherein:
Said root node also is used for after receiving first label mapping message that downstream node sends; For this two-way P2MP LSP distributes a upstream label; Send for the downstream node of this node to carry second label mapping message of this upstream label that this node distributes to sending first label mapping message, and the upstream label of creating this two-way P2MP LSP on this node is transmitted;
Said intermediate node also is used for after receiving second label mapping message; For this two-way P2MP LSP distributes a upstream label; Send for the downstream node of this node to carry second label mapping message of this upstream label that this node distributes to sending first label mapping message, and create on this node the upstream label of this two-way P2MPLSP and transmit;
Said leaf node also is used for after receiving second label mapping message, creates the upstream label of this two-way P2MP LSP on this node and transmits.
Preferably, in the said system,
Also carry the descending P2MP LSP forwarding equivalence class (FEC) of the downlink path that is used to identify this two-way P2MP LSP in first label mapping message that said leaf node and intermediate node send;
Also carry the up P2MP LSP forwarding equivalence class of the up path that is used to identify this two-way P2MP LSP in second label mapping message that said root node and intermediate node send, and said descending P2MPLSP forwarding equivalence class is different with up P2MP LSP forwarding equivalence class.
Preferably, in the said system,
The intermediate node of this two-way P2MP LSP and root node are received first label mapping message that a downstream node sends for the first time; As receive first label mapping message that another downstream node sends once more; Then upgrade the descending Label Forwarding Information Base of this two-way P2MP LSP on this node of having created; And receive second label mapping message that upstream node sends at this node; For after this two-way P2MP LSP distributed upstream label; Send second label mapping message of this upstream label of carrying the distribution of this node to this another downstream node, and the upstream label of this two-way P2MP LSP is transmitted the relevant forwarding entry of all downstream nodes that comprises and sent first label mapping message before this to this node on this node of creating or upgrading.
Below with the practical application of a bright such scheme of as an exampleBSEMGVR takeN-PSVSEMOBJ.As shown in Figure 1, to set up a two-way P2MP LSP between a root node LSR1 in the MPLS network, 1 intermediate node LSR2,2 leaf node LSR3 and the LSR4, transmission belonging to the message with a kind of business.On two-way P2MPLSP, the forwarding of this direction is called descending forwarding from the root to the leaf, and the forwarding of this direction is called forwarded upstream from the leaf to the root.
The method that this example is set up two-way P2MP LSP is downstream distributing labels and sequential system.Because there are a plurality of leaf nodes in two-way P2MP LSP; And these leaf nodes are difficult to accomplish send simultaneously label mapping message; At first initiate label mapping message so suppose leaf node 2; But when leaf node 3 initiates label mapping message is uncertain, can 1. 3. 4. 5. accomplish after any one step, this instance hypothesis leaf node 3 be step 1. after the label mapping message of initiation.
This example generates Label Forwarding Information Base through LDP agreement each node in P2MP LSP, sets up the two-way P2MP LSP with descending P2MP path and reverse path identical with downlink path, thereby realizes the message transmitted in both directions, specifically may further comprise the steps:
Step 1; Leaf node is this two-way P2MPLSP allocation of downlink label; Create the descending Label Forwarding Information Base of this two-way P2MPLSP, and upstream nodes is sent the label mapping message that carries descending P2MP LSP FEC (FEC is a forwarding equivalence class, LSP of unique identification) and this descending label;
As the step among Fig. 2 1. shown in, LSR3 sends the label mapping message carry descending P2MP LSP FEC and label L1 to LSR2; As the step among Fig. 2 2. shown in, LSR4 sends the label mapping message carry descending P2MP LSP FEC and label L2 to LSR2.
Step 2, whether intermediate node LSR2 inspection has the descending forwarding state of this two-way P2MP LSP, if having, forwards step 7 to, as does not have, and forwards step 3 to;
Certain node has the descending forwarding state of this two-way P2MP LSP to refer to that there is the descending Label Forwarding Information Base of this two-way P2MP LSP in this node, has the forwarded upstream state of this two-way P2MP LSP to refer to that this node exists the upstream label of this two-way P2MP LSP to transmit.LSR2 should forward step 3 to after receiving the label mapping message of leaf node LSR3 transmission, creates the descending Label Forwarding Information Base of this two-way P2MP LSP.If receive the label mapping message that LSR4 sends, then forward step 7 to afterwards.
Step 3; Intermediate node LSR2 distributes a descending label L4 for this two-way P2MP LSP; Create the descending Label Forwarding Information Base of this two-way P2MP LSP at this node, continue to send the label mapping message that carries descending P2MP LSP FEC and label L4 to root node LSR1, as Fig. 2 step 3. shown in;
The descending Label Forwarding Information Base that LSR2 forms is as shown in Figure 2, sets up Label Forwarding Information Base please with reference to protocol contents according to label.
Step 4, after root node LSR1 received the label mapping message of LSR2 transmission, whether inspection had the descending forwarding state of this two-way P2MP LSP; If have, root node LSR1 upgrades descending Label Forwarding Information Base, will comprise label L4; The forwarding entry of outgoing interface S3 joins in the descending Label Forwarding Information Base, if do not have, root node LSR1 creates descending Label Forwarding Information Base; Forwarding entry after the establishment be (user interface 1)-＞< S3, L4 >, as shown in Figure 2;
So far, the downlink path of this two-way P2MP LSP is set up and is accomplished.
Step 5; After root node LSR1 received the label mapping message of LSR2 transmission, whether inspection had the forwarded upstream state of this two-way P2MP LSP, if do not have; Then distribute upstream label L5 for this two-way P2MP LSP; Create the upstream label of this two-way P2MP LSP FEC at this node and transmit, send the label mapping message that carries 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 the establishment upstream label is transmitted; The label mapping message of root node LSR1 as receiving that once more other downstream nodes send; LSR1 can upgrade this upstream label and transmit, and adds relative transferring item, and sends the label mapping message that carries descending P2MP LSPFEC and same label L5 to this downstream node.
Step 6; After the LSR2 node was received the label mapping message of upstream node LSR1 transmission, this two-way P2MP LSP distributed upstream label L3 for this reason, created the upstream label of this two-way P2MP LSP at this node and transmitted; Send the label mapping message that carries descending P2MP LSP FEC and label L3 to leaf node LSR3; As Fig. 2 step 5. shown in, after leaf node LSR3 receives this label mapping message, create the upstream label of this two-way P2MP LSP at this node and transmit;
Step 7; LSR2 upgrades the descending Label Forwarding Information Base of this two-way P2MP LSP; Add and the relevant forwarding entry of node that sends label mapping message; Receive label mapping message that upstream node sends for after should two-way P2MP LSP distributing upstream label L3 (being the operation of the distribution upstream label L3 that LSR2 carries out in the step 6) at LSR2, carry the label mapping message of descending P2MP LSP FEC and label L3 to leaf node LSR4 transmission, as Fig. 2 step 6. shown in; After leaf node LSR4 receives this label mapping message, create the upstream label of this two-way P2MP LSP at this node and transmit;
If LSR2 creates the upstream label of this two-way P2MP LSP and transmits the label mapping message of promptly having received that LSR4 sends before; Then can the adding forwarding entry relevant when creating this upstream label and transmit with LSR3 and LSR4; If also do not receive; Then after receiving the label mapping message that LSR4 sends, upgrade this upstream label of having set up and transmit, add the forwarding entry relevant with LSR4.
Can find out from above-mentioned example; Intermediate node that should two-way P2MP LSP; After receiving for the first time first label mapping message that a downstream node sends; For this two-way P2MP LSP distributes rower label, create the descending Label Forwarding Information Base of this two-way P2MP LSP on this node, and upstream nodes is sent first label mapping message that carries this descending label; Afterwards; After receiving second label mapping message that downstream node sends; This intermediate node distributes a upstream label for this two-way P2MP LSP; Create the upstream label of this two-way P2MP LSP on this node and transmit, send second label mapping message of this upstream label of carrying the distribution of this node to this downstream node;
When this intermediate node is received first label mapping message of another downstream node transmission once more; Upgrade the descending Label Forwarding Information Base of this two-way P2MP LSP on this node; Add the forwarding entry relevant with this another downstream node; As this moment this intermediate node distributed upstream label for this two-way P2MP LSP and created upstream label and transmit; Then, this upstream label adds the forwarding entry relevant in transmitting with this another downstream node; And send second label mapping message that carries this upstream label that this node distributes to this another downstream node, otherwise wait for that this intermediate node receives the label mapping message that upstream node sends, for after two-way P2MP LSP distributes upstream label; Transmit the middle relevant forwarding entry of all downstream nodes that adds and sent first label mapping message for this node before this for the upstream label of this two-way P2MP LSP establishment again, and send second label mapping message of this upstream label of carrying the distribution of this node to this another downstream node.
Root node for this two-way P2MP LSP; After receiving for the first time first label mapping message of a downstream node transmission; Create the descending Label Forwarding Information Base of this two-way P2MP LSP on this node; And distribute a upstream label for this two-way P2MP LSP, create the upstream label of this two-way P2MP LSP on this node and transmit; After this root node is received first label mapping message of another downstream node transmission once more; Upgrade the descending Label Forwarding Information Base of this two-way P2MP LSP on this node; Add the forwarding entry relevant with this another downstream node; As this moment this root node distributed upstream label for this two-way P2MP LSP and created upstream label and transmit; Then, this upstream label adds the forwarding entry relevant in transmitting with this another downstream node; And send second label mapping message that carries this upstream label that this node distributes to this another downstream node; Otherwise wait for that this root node is after two-way P2MP LSP distributes upstream label, transmits the middle relevant forwarding entry of all downstream nodes that adds and sent first label mapping message for this node before this for the upstream label of this two-way P2MP LSP establishment again, and sends second label mapping message of this upstream label of carrying the distribution of this node to this another downstream node.
Because intermediate node LSR2 is an aggregation of leaf node 2 and leaf node 3, so the upstream label of distributing to same two-way P2MP LSP is identical, LSR2 is label L3 to the upstream label of leaf node LSR3 and LSR4 distribution.
So far, the up path of two-way P2MP LSP is set up and is accomplished among Fig. 2, and each node all can have two kinds of Label Forwarding Information Base as shown in Figure 2.More than the process of setting up of two-way P2MP LSP, also can initiate by the part leaf node.
When the message of root node through the user interface reception user transmitting terminal transmission of self; And transmit according to the descending of self; Duplicate n part message; And in each message that is duplicated respectively behind the corresponding outgoing label (being descending label) of encapsulation, send to respectively through self n downstream interface on n the intermediate node in self downstream.Each intermediate node receives message through the Upstream Interface of self; And according to self descending Label Forwarding Information Base; Duplicate the received message of m part,, send to m the leaf node in self downstream respectively through self m interface after the outgoing label in each message that the duplicates replacement.Each leaf node receives message through the Upstream Interface of self; If receive encapsulate in the message go into this Upstream Interface in label and self the descending Label Forwarding Information Base corresponding to go into label identical, then received message is sent to user's receiving terminal through self user interface.
When the one or more nodes in m the leaf node receive the message that user's transmitting terminal sends through self user interface; Upstream label according to self is transmitted; In received message, encapsulate outgoing label (being upstream label), and send to the intermediate node at self upper reaches through self Upstream Interface; After each intermediate node receives the message that one or more leaf nodes send through self interface; For any message in each received message; If in this message in packaged outgoing label and the intermediate node forwarded upstream table corresponding outgoing label identical; Then transmit this message, and the outgoing label in this message replaced to the outgoing label in the forwarded upstream table of intermediate node, send to the root node at self upper reaches through self Upstream Interface; Root node receives the message that said one or more intermediate node sends; For any a message wherein; If corresponding in transmitting to go into label identical for go into label and the root node upstream label that encapsulate in this message; Then transmit this message, the user interface through root node self sends to user's receiving terminal.
In real process through two-way P2MP LSP message transmission; Can only comprise process along two-way P2MPLSP downlink path message transmission; Also can only comprise process along two-way P2MP LSP up path message transmission; Can also comprise above-mentioned two processes simultaneously, it is definite specifically can to make a return journey according to actual needs.
The flow process of transmitted in both directions message in the MPLS network in the present embodiment, can guarantee the message trip path the node of process identical, and the downlink message transmission adopts multicasting technology to carry out.
Embodiment two
Embodiment one is for setting up the process of a two-way P2MP LSP through the LDP agreement, present embodiment then is the process that adopts the LDP agreement to remove two-way P2MPLSP, wherein:
In the multiprotocol label switching (mpls) network; Adopt tag distribution protocol; Remove the flow process of the downlink path of part at least of two-way P2MPLSP; Can be identical with dismounting flow process to unidirectional P2MPLSP downlink path in the existing tag distribution protocol, cancel message through the label that carries descending label between the node of upstream and downstream and first label release message is mutual.
In the multiprotocol label switching (mpls) network, adopt tag distribution protocol, remove the up path of part at least of two-way P2MP LSP by following mode:
The waiting of this two-way P2MP LSP removed the upstream label that intermediate node that leaf node and all downstream nodes all are removed empties this two-way P2MP LSP and transmitted, and upstream nodes is sent and is used for second label release message that up path is removed; Receive upstream label that the node of second label release message will this two-way P2MPLSP transmit in corresponding clauses and subclauses deletion.
The up path of part at least of this two-way P2MP LSP of above-mentioned dismounting specifically can comprise:
This two-way P2MP LSP leaf node to be removed empties the upstream label of this two-way P2MP LSP on this node and transmits, and upstream nodes is sent second label release message;
The intermediate node of receiving second label release message is from the upstream label of this two-way P2MP LSP of this node is transmitted; Deletion and the relevant forwarding entry of downstream node that sends second label release message; Forwarding entry as this upstream label is transmitted is empty, and upstream nodes is sent second label release message again;
After the root node of this two-way P2MP LSP is received second label release message, from the upstream label of this two-way P2MP LSP of this node is transmitted, deletion and the relevant forwarding entry of downstream node that sends 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 that first label release message that is used for the downlink path dismounting carries.The root node of this two-way P2MP LSP and intermediate node can confirm that the upstream label of two-way P2MP LSP is transmitted or descending Label Forwarding Information Base according to up P2MP LSP forwarding equivalence class in the label release message or descending P2MP LSP forwarding equivalence class, confirm the clauses and subclauses that will delete according to the node that sends label release message.
Still use MPLS network shown in Figure 1 practical application below as the bright present embodiment such scheme of as an exampleBSEMGVR takeN-PSVSEMOBJ, please be simultaneously with reference to Fig. 3, the process that this employing LDP agreement is removed two-way P2MP LSP specifically may further comprise the steps:
Step 1, leaf node upstream nodes LSR2 to be removed sends the label that carries descending P2MP LSPFEC and descending label and cancels message, and the label release message that carries 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, and then upstream nodes LSR2 sends the label that carries descending P2MP LSP FEC and label L1 and cancels message, and the label release message that carries up P2MP LSP FEC;
LSR4 finds that this node has not been the leaf node of two-way P2MP LSP, and then upstream nodes LSR2 sends the label that carries descending P2MP LSP FEC and label L2 and cancels message, and the label release message that carries up P2MP LSP FEC.
Step 2; LSR2 deletes the forwarding entry that comprises label L1 and L2 from the descending Label Forwarding Information Base of this two-way P2MP LSP; And respond label release message and give leaf node LSR3 and LSR4, deletion comprises label L3 from the upstream label of this two-way P2MP LSP is transmitted simultaneously, and incoming interface is S1; And label L3, incoming interface is the forwarding entry of S0;
As shown in Figure 3, after LSR2 received that the label of LSR3 transmission is cancelled message, deletion comprised label L1 from the descending Label Forwarding Information Base of this two-way P2MPLSP, and the clauses and subclauses of outgoing interface S1 are responded label release message and given leaf node LSR3; After LSR2 received the label release message of LSR3 transmission, deletion comprised label L3, the forwarding entry of incoming interface S1 from upstream label is transmitted.
After LSR2 cancels message from the label of receiving the LSR4 transmission; Deletion comprises label L2 from the descending Label Forwarding Information Base of this two-way P2MPLSP; The clauses and subclauses of outgoing interface S0 are responded label release message and are given leaf node LSR4, after LSR2 receives the label release message of LSR4 transmission; Deletion comprises label L3, the forwarding entry of incoming interface S0 from upstream label is transmitted.
Step 3; If LSR2 also has downstream node; Upstream label is transmitted and descending Label Forwarding Information Base is not cleared, and can not send any label to root node 1 and cancel message and label release message, if LSR2 has not had downstream node; Then the upstream label of this two-way P2MP LSP is transmitted with descending Label Forwarding Information Base and is cleared, and changes step 4 over to;
As shown in Figure 3, after LSR2 received that the label of LSR3 is cancelled message and label release message, because LSR4 still is effective downstream node, LSR2 did not send label to LSR1 and cancels message and label release message.After LSR2 received that once more the label of LSR4 is cancelled message and label release message, because LSR4 is last leaf node of LSR2, the upstream label of the two-way P2MP LSP of LSR2 was transmitted with descending Label Forwarding Information Base and is cleared.
Step 4, LSR2 sends the label carry descending P2MP LSP FEC and label L4 and cancels message, and the label release message that carries this up P2MP LSP FEC is to root node LSR1;
Step 5, after LSR1 received that the label of LSR2 transmission is cancelled message, deletion comprised label L4 from the descending Label Forwarding Information Base of this two-way P2MP LSP, the forwarding entry of outgoing interface S3, and reply label release message and give LSR2; After LSR1 received the label release message of LSR2 transmission from incoming interface S3, deletion comprised label L5, the forwarding entry of incoming interface S3 from the upstream label of this two-way P2MP LSP is transmitted.
Through this process, the label removal process of whole two-way P2MP LSP is accomplished, but said process is not to carry out, and when for example iff is removed one of them leaf, only needs execution in step one to three.
One of ordinary skill in the art will appreciate that all or part of step in the said method can instruct related hardware to accomplish through program, said program can be stored in the computer-readable recording medium, like read-only memory, disk or CD etc.Alternatively, all or part of step of the foregoing description also can use one or more integrated circuits to realize, correspondingly, each the module/unit in the foregoing description can adopt the form of hardware to realize, also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (15)

1. a method of setting up two-way point to multiple spot label forwarding path (P2MP LSP) adopts tag distribution protocol to set up two-way P2MP LSP in the multiprotocol label switching (mpls) network, comprising:
Begin from least one leaf node of two-way P2MP LSP; Send first label mapping message that carries descending label by the node upstream nodes; Each node is created the descending Label Forwarding Information Base of this two-way P2MP LSP, thereby sets up the downlink path from the root node to the leaf node of this two-way P2MP LSP;
Begin from the root node of this two-way P2MP LSP; Carry second label mapping message of upstream label for the downstream node transmission of this node by node to sending first label mapping message; Each node is created the upstream label of this two-way P2MP LSP and is transmitted, thereby sets up the up path from the leaf node to the root node of this two-way P2MP LSP;
And the up path of this two-way P2MP LSP is identical with the node of downlink path process.
2. the method for claim 1 is characterized in that, the said up path of setting up this two-way P2MPLSP specifically comprises:
After the root node of this two-way P2MP LSP is received first label mapping message; For this two-way P2MPLSP distributes a upstream label; Create the upstream label of this two-way P2MP LSP on this node and transmit, and send second label mapping message of this upstream label of carrying the distribution of this node for the downstream node of this node to sending first label mapping message;
The intermediate node of receiving second label mapping message distributes a upstream label for this two-way P2MP LSP; Create the upstream label of this two-way P2MP LSP on this node and transmit, and send second label mapping message of this upstream label of carrying the distribution of this node for the downstream node of this node to sending first label mapping message;
The leaf node of receiving second label mapping message is created the upstream label of this two-way P2MP LSP on this node and is transmitted.
3. according to claim 1 or claim 2 method is characterized in that:
The root node of this two-way P2MP LSP and intermediate node send one second label mapping message to each downstream node of this node, and second label mapping message that sends to all downstream nodes of this node carries identical upstream label.
4. method as claimed in claim 2 is characterized in that:
The intermediate node of this two-way P2MP LSP and root node are received first label mapping message that a downstream node sends for the first time; As receive first label mapping message that another downstream node sends once more; Then upgrade the descending Label Forwarding Information Base of this two-way P2MP LSP on this node of having created; And receive second label mapping message that upstream node sends at this node; For after this two-way P2MP LSP distributed upstream label; Send second label mapping message of this upstream label of carrying the distribution of this node to this another downstream node, and the upstream label of this two-way P2MP LSP is transmitted the relevant forwarding entry of all downstream nodes that comprises and sent first label mapping message before this to this node on this node of creating or upgrading.
5. according to claim 1 or claim 2 method is characterized in that:
After the downlink path of this two-way P2MP LSP and up path are set up and are accomplished; The message that user's transmitting terminal of receiving for root node sends; Each node is searched the descending Label Forwarding Information Base of this node, and the downlink path of this two-way P2MP LSP of edge is transmitted to user's receiving terminal with said message;
The message that user's transmitting terminal of receiving for leaf node sends, each node is searched the upstream label of this node and is transmitted, and the up path of this two-way P2MP LSP of edge is transmitted to user's receiving terminal with said message.
6. according to claim 1 or claim 2 method is characterized in that:
Also carry the descending P2MP LSP forwarding equivalence class (FEC) of the downlink path that is used to identify this two-way P2MP LSP in said first label mapping message; Also carry the up P2MP LSP forwarding equivalence class of the up path that is used to identify this two-way P2MP LSP in said second label mapping message, said descending P2MP LSP forwarding equivalence class is different with up P2MP LSP forwarding equivalence class.
7. method of removing two-way point to multiple spot label forwarding path (P2MP LSP) comprising:
In the multiprotocol label switching (mpls) network, adopt tag distribution protocol, remove the up path of part at least of two-way P2MP LSP by following mode:
The waiting of this two-way P2MP LSP removed the upstream label that intermediate node that leaf node and all downstream nodes all are removed empties this two-way P2MP LSP and transmitted, and upstream nodes is sent and is used for second label release message that up path is removed; Receive upstream label that the node of second label release message will this two-way P2MPLSP transmit in corresponding clauses and subclauses deletion.
8. method as claimed in claim 7 is characterized in that, the up path of part at least of said this two-way P2MPLSP of dismounting specifically comprises:
This two-way P2MP LSP leaf node to be removed empties the upstream label of this two-way P2MP LSP on this node and transmits, and upstream nodes is sent second label release message;
The relevant forwarding entry of downstream node of second label release message is deleted and sent to the intermediate node of receiving second label release message from the upstream label of this two-way P2MP LSP of this node is transmitted; Forwarding entry as this upstream label is transmitted is empty, and upstream nodes is sent second label release message again;
After the root node of this two-way P2MP LSP is received second label release message, from the upstream label of this two-way P2MP LSP of this node is transmitted, deletion and the relevant forwarding entry of downstream node that sends second label release message.
9. like claim 7 or 8 described methods, it is characterized in that, also comprise:
In said multiprotocol label switching (mpls) network; Adopt the dismounting flow process of unidirectional P2MPLSP downlink path in the tag distribution protocol; It is mutual with first label release message that is used for the downlink path dismounting to cancel message through the label that carries descending label between the upstream and downstream node of this two-way P2MP LSP, the downlink path of part at least of removing this two-way P2MP LSP.
10. method as claimed in claim 9 is characterized in that:
Carry the up P2MP LSP forwarding equivalence class (FEC) of the up path that is used to identify this two-way P2MP LSP in said second label release message; Carry the descending P2MP LSP forwarding equivalence class of the downlink path that is used to identify this two-way P2MP LSP in said first label release message, said up P2MPLSP forwarding equivalence class is different with descending P2MP LSP forwarding equivalence class.
11. system that sets up two-way point to multiple spot label forwarding path (P2MP LSP); The root node, intermediate node and the leaf node that comprise this two-way P2MP LSP; Each node adopts 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:
Said root node also is used for after receiving first label mapping message that downstream node sends; For this two-way P2MP LSP distributes a upstream label; Send for the downstream node of this node to carry second label mapping message of this upstream label that this node distributes to sending first label mapping message, and the upstream label of creating this two-way P2MP LSP on this node is transmitted;
Said intermediate node also is used for after receiving second label mapping message; For this two-way P2MP LSP distributes a upstream label; Send for the downstream node of this node to carry second label mapping message of this upstream label that this node distributes to sending first label mapping message, and create on this node the upstream label of this two-way P2MPLSP and transmit;
Said leaf node also is used for after receiving second label mapping message, creates the upstream label of this two-way P2MP LSP on this node and transmits.
12. system as claimed in claim 11 is characterized in that:
The intermediate node of this two-way P2MP LSP and root node are received first label mapping message that a downstream node sends for the first time; As receive first label mapping message that another downstream node sends once more; Then upgrade the descending Label Forwarding Information Base of this two-way P2MP LSP on this node of having created; And receive second label mapping message that upstream node sends at this node; For after this two-way P2MP LSP distributed upstream label; When the upstream label of creating or upgrade this two-way P2MP LSP on this node is transmitted, add the forwarding entry relevant, carry second label mapping message of this upstream label of this node distribution to this another downstream node transmission with this another downstream node.
13., it is characterized in that like claim 11 or 12 described systems:
Also carry the descending P2MP LSP forwarding equivalence class (FEC) of the downlink path that is used to identify this two-way P2MP LSP in first label mapping message that said leaf node and intermediate node send;
Also carry the up P2MP LSP forwarding equivalence class of the up path that is used to identify this two-way P2MP LSP in second label mapping message that said root node and intermediate node send, and said descending P2MPLSP forwarding equivalence class is different with up P2MP LSP forwarding equivalence class.
14. system of removing two-way point to multiple spot label forwarding path (P2MP LSP); The root node, intermediate node and the leaf node that comprise this two-way P2MP LSP; Each node adopts the label of tag distribution protocol to cancel message and first label release message is mutual; Remove the downlink path of this two-way P2MP LSP, it is characterized in that:
Said leaf node also is used for when definite this node need be removed, and the upstream label that empties this two-way P2MP LSP on this node is transmitted, and upstream nodes is sent second label release message;
Said intermediate node also is used for after receiving second label release message; From the upstream label of this two-way P2MP LSP of this node is transmitted; Deletion and the relevant forwarding entry of downstream node that sends second label release message; Forwarding entry as this upstream label is transmitted is empty, and upstream nodes is sent second label release message again;
Said root node also is used for after receiving second label release message, from the upstream label of this two-way P2MPLSP of this node is transmitted, and deletion and the relevant forwarding entry of downstream node that sends second label release message.
15. system as claimed in claim 14 is characterized in that:
Carry the up P2MP LSP forwarding equivalence class (FEC) of the up path that is used to identify this two-way P2MP LSP in second label release message that said leaf node and intermediate node send;
Carry the descending P2MP LSP forwarding equivalence class of the downlink path that is used to identify this two-way P2MP LSP in first label release message that said leaf node and intermediate node send, said up P2M LSP forwarding equivalence class is different with descending P2MP LSP forwarding equivalence class.
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