WO2013026399A1 - Procédé, dispositif et système pour établir une ms-pw p2mp - Google Patents

Procédé, dispositif et système pour établir une ms-pw p2mp Download PDF

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Publication number
WO2013026399A1
WO2013026399A1 PCT/CN2012/080490 CN2012080490W WO2013026399A1 WO 2013026399 A1 WO2013026399 A1 WO 2013026399A1 CN 2012080490 W CN2012080490 W CN 2012080490W WO 2013026399 A1 WO2013026399 A1 WO 2013026399A1
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Prior art keywords
p2mp
information
spe
tpe
source
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PCT/CN2012/080490
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English (en)
Chinese (zh)
Inventor
薛莉
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华为技术有限公司
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Publication of WO2013026399A1 publication Critical patent/WO2013026399A1/fr

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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
    • H04L45/68—Pseudowire emulation, e.g. IETF WG PWE3
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks

Definitions

  • the present invention relates to a pseudowire establishment technology, and in particular, to a method for establishing a P2MP MS-PW, a source termination operator edge device, and a P2MP MS-PW system. Background technique
  • Pseudo Wire is used to simulate user traffic between user edge CE (Customer Edge) devices.
  • PW applications are divided into P2P PW (Point-to-Point PW) and P2MP PW (Point-to-Multi Point PW).
  • P2P PW Point-to-Point PW
  • P2MP PW Point-to-Multi Point PW
  • P2MP PW is established to ensure point-to-multipoint service requirements.
  • the P2MP PW is a PW that transmits unidirectionally from the source node to the leaf node to implement multicast service simulation.
  • P2MP PW is divided into point-to-multipoint single-segment pseudowire P2MP SS-PW (P2MP Single Segment PW) and point-to-multipoint multi-segment pseudowire P2MP MS-PW (P2MP Multi- Segment PW).
  • P2MP MS-PW The establishment of P2MP MS-PW is currently only static establishment. When establishing, first establish the segments of the P2MP MS-PW, and then manually configure the mapping relationship between the initial segment and subsequent segments.
  • the embodiment of the present invention provides a method for establishing a P2MP MS-PW, a source termination operator edge device, and a P2MP MS-PW system, so as to implement dynamic establishment of a P2MP MS-PW, and avoid switching the carrier edge SPE (switch/switching provider).
  • Edge Configure PW segmentation on the node Mapping.
  • the embodiment of the invention provides a method for establishing a point-to-multipoint multi-segment pseudowire P2MP MS-PW, including:
  • the source end operator edge TPE configures P2MP MS-PW establishment information, and the P2MP MS-PW establishment information includes explicit routing information;
  • the source TPE sends a Label Switching Protocol LDP packet carrying the P2MP MS-PW establishment information to the switching operator edge SPE;
  • the SPE After receiving the LDP packet, the SPE finds an egress port of the LDP packet according to the explicit routing information, and uses the egress port to forward the LDP packet.
  • the embodiment of the invention further provides a source termination operator edge device, including:
  • a configuration unit configured to configure a point-to-multipoint multi-segment pseudowire P2MP MS-PW establishment information, where the P2MP MS-PW establishment information includes explicit routing information;
  • a sending unit configured to send, to the switching carrier edge SPE, a label switching protocol LDP packet carrying the P2MP MS-PW setup information, so that after the SPE receives the LDP packet, according to the The explicit routing information finds the egress port of the LDP packet, and uses the egress port to forward the LDP packet.
  • the embodiment of the present invention further provides a point-to-multipoint multi-segmented pseudowire P2MP MS-PW system, including a source-end operator edge TPE, a switching carrier edge SPE, and a leaf TPE, where P2MP is configured in the source TPE.
  • the MS-PW establishes the information, where the P2MP MS-PW setup information includes the explicit routing information, and sends the label switching protocol LDP packet carrying the P2MP MS-PW setup information; the SPE is configured to receive the LDP packet.
  • the outbound port of the LDP packet is found according to the SPE identifier in the explicit routing information, and the LDP packet is forwarded by using the egress port; the leaf TPE receives the LDP packet forwarded by the SPE Text.
  • the method for establishing a P2MP MS-PW, the source termination operator edge device, and the P2MP MS-PW system configureds the explicit routing information of the P2MP MS-PW and sends the P2MP MS-PW explicit configuration on the source TPE.
  • the P2MP MS-PW LDP packet of the routing information completes the P2MP MS-PW establishment. This avoids a large number of complicated configuration operations and simplifies P2MP.
  • the MS-PW establishment process improves the establishment efficiency of the P2MP MS-PW.
  • FIG. 1 is a flowchart of a method for establishing a P2MP MS-PW according to an embodiment of the present invention
  • FIG. 2A is a schematic structural diagram of P2MP MS-PW FEC information in a method for establishing a P2MP MS-PW according to an embodiment of the present invention
  • 2B is another schematic structural diagram of P2MP MS-PW FEC information in a method for establishing a P2MP MS-PW according to an embodiment of the present invention
  • 2C is a schematic structural diagram of another P2MP MS-PW FEC information in a method for establishing a P2MP MS-PW according to an embodiment of the present invention
  • 2D is a schematic structural diagram of another P2MP MS-PW FEC information in a method for establishing a P2MP MS-PW according to an embodiment of the present invention
  • FIG. 2E is a schematic structural diagram of the "SPEn identifier sub-TLV" field in FIG. 2D;
  • FIG. 3 is a flowchart of a method for establishing a P2MP MS-PW according to Embodiment 1 of the present invention
  • FIG. 4 is a schematic structural diagram of a P2MP MS-PW system applied to a method for establishing a P2MP MS-PW according to an embodiment of the present invention
  • FIG. 5 is a flowchart of a method for establishing a P2MP MS-PW according to Embodiment 2 of the present invention
  • FIG. 6 is a schematic structural diagram of another P2MP MS-PW system applied to a method for establishing a P2MP MS-PW according to an embodiment of the present invention
  • FIG. 7 is a schematic structural diagram of another P2MP MS-PW system applied to a method for establishing a P2MP MS-PW according to an embodiment of the present disclosure
  • 8A is a schematic diagram of providing P2P MS-PW segmentation protection by establishing a virtual P2MP MS-PW according to an embodiment of the present invention
  • 8B is a flowchart of a method for establishing a P2MP MS-PW according to Embodiment 3 of the present invention
  • FIG. 8C is a flowchart of a method for establishing a P2MP MS-PW according to Embodiment 4 of the present invention
  • FIG. 10 is a schematic structural diagram of another P2MP MS-PW system according to an embodiment of the present invention.
  • FIG. 1 is a flowchart of a method for establishing a P2MP MS-PW according to an embodiment of the present invention. As shown in Figure 1, the method for establishing a P2MP MS-PW includes:
  • the source end operator Provider Edge configures the P2MP MS-PW establishment information, and the P2MP MS-PW establishment information includes explicit routing information.
  • the explicit routing information may be an identifier of the SPE on the P2MP MS-PW to be established.
  • the source TPE sends an LDP packet carrying the P2MP MS-PW setup information to the SPE.
  • the SPE After receiving the LDP packet, the SPE finds an egress port of the LDP packet according to the explicit routing information, and uses the egress port to forward the LDP packet.
  • the method for establishing a P2MP MS-PW may further include: configuring, by the source TPE, the LSP information that carries the P2MP MS-PW;
  • the LDP packet when the source TPE sends the LDP packet, the LDP packet further carries the LSP information, for example, the LSP information may include carrying each PW segment in the P2MP MS-PW. LSP information.
  • the LDP packet may also carry a label for establishing a PW required to transmit the data traffic of the leaf T P E to the source T P E .
  • the primary and backup features of the PW segment are set in the P2MP MS-PW establishment process
  • the explicit routing information further includes the active and standby information of the explicit route
  • the SPE further determines the active/standby state of the egress port according to the active and standby information of the explicit route.
  • the explicit routing information may include the active/standby status information of the SPE, or the explicit routing information includes the primary and backup status information of the outbound port that forwards the LDP packet;
  • the SPE of the LDP packet to the P2MP MS-PW may determine the active/standby state of the SPE based on the active/standby status information of the SPE or the primary and backup status information of the outbound interface of the LDP packet.
  • the active/standby status of the outbound port of the LDP packet is forwarded to determine the active/standby status of the corresponding PW segment.
  • the source TPE configuring the P2MP MS-PW establishment information may include: the source TPE configuring the virtual P2MP MS-PW establishment information.
  • the P2MP MS-PW is established by configuring the explicit routing information of the PW in the source TPE and carrying the PW explicit routing information in the LDP packet sent by the P2MP MS-PW, thereby avoiding a large number of complicated configuration operations. It simplifies the establishment process of P2MP MS-PW and improves the establishment efficiency of P2MP MS-PW. Further, the P2MP MS-PW establishment method is extended to the P2MP MS-PW segmentation flexible protection by configuring the active and standby information of the explicit route in the source TPE. Further, the P2MP MS-PW with the segmentation protection function is established by configuring the virtual P2MP MS-PW to establish information on the source TPE and carrying the establishment information of the virtual P2MP MS-PW in the transmitted LDP packet.
  • the LDP packet in this embodiment can be improved based on the LDP packet of the standard P2MP SS-PW signaling.
  • the embodiment of the invention is defined in a standard LDP packet.
  • a new type of length value TLV (type-length-value)-explicit route TLV (expressive route TLV) the explicit routing TLV carries information about the SPE on the P2MP MS-PW, such as P2MP MS-PW The identity of multiple SPEs (SPEn Identifier).
  • the explicit routing TLV described above may be used as part of the P2MP SS-PW Forwarding Equivalence Class (FEC) information, or may be combined with the P2MP SS-PW FEC information as part of the LDP packet.
  • FEC Forwarding Equivalence Class
  • the SPE device When receiving the LDP packet, the SPE device processes the LDP packet by reading the TLV information, and initiates the establishment of the next PW segment in the P2MP PW.
  • the explicit routing information may be carried in the format shown in FIG. 2A and FIG. 2B, wherein the SPE node information of the explicit routing information may be carried in the value part of the TLV as shown in FIG. 2A (the SPEn identifier in FIG. 2A). ).
  • the SPE node information of the explicit routing information may also be carried in the form of sub-tlv.
  • the SPE information is carried in the LSP (each hop sub-tlv) of the explicit route, and the information of the LSP starting from the SPE may be further carried.
  • the type (Type) values in Figure 2A and 2B do not conflict with the standard.
  • the selection follows RFC3036, and any of the reserved values can be used, or other values that do not conflict with the existing TLV.
  • the length (length) value is a variable value, the first length identifies the length of the FEC, the second length identifies the AGI length, and the third length identifies the length of the Attachment Individual Identifier.
  • Explicit Routing The Length in the TLV identifies the length of the SPEn ID field.
  • the optional parameter (Optional parameters) field can also be used to carry the next hop information or forward the outbound port, so that the SPE can directly find the outbound port of the LDP packet according to the next hop information or the forwarding port.
  • FIG. 2A and FIG. 2B show two specific P2MP PW FEC examples, and the actual P2MP PW FEC is not limited thereto.
  • Embodiment 1 The establishment process of the P2MP MS-PW is shown in Figure 3, including:
  • the P2MP MS-PW setup information includes an Attachment Group Identifier (AGI), a Source Attachment Individual Identifier (SAII), and explicit routing information.
  • AGI Attachment Group Identifier
  • SAII Source Attachment Individual Identifier
  • the bearer LSP information may be configured in the source TPE in advance.
  • the P2MP MS-PW needs to be configured with LSP information carrying PW segments.
  • the P2MP MS-PW segment of the P2MP is an SPE connected to multiple SPEs or multiple TPEs.
  • the PW2 segment shown in Figure 10 belongs to the P2MP type, and the SPE1 and the three leaf nodes TPE2, TPE3, and TPE4.
  • the configured LSP information may be an identifier of the LSP, for example, an LSP quintuple, including a source IP address, a destination IP address, a protocol number, a source port, and a destination port.
  • the source TPE sends an LDP packet, where the LDP packet carries the AGI, the SAII information, and explicit routing information.
  • the FEC information extended as shown in FIG. 2A and FIG. 2B can be used to carry the AGI, the SAII information, and the explicit routing information.
  • the group information to which the AGI and the leaf TPE belong is configured on the leaf TPE node.
  • the LDP packet further carries LSP information that carries the PW segment. For example, if the source TPE is configured to carry the LSP information, the LDP packet sent by the source TPE further carries the configured LSP information.
  • the LDP packet may further carry a label of a reverse P2P MS-PW that establishes a leaf TPE to source TPE data traffic.
  • a reverse P2P MS-PW that establishes a leaf TPE to source TPE data traffic.
  • the P2P MS-PW is unidirectional, that is, only transmitted from the source.
  • the data traffic of the leaf TPE to the source TPE may carry the label required for establishing the reverse P2P MS-PW, and the label required to establish the reverse P2P MS-PW and the slave source TPE are established.
  • the tags required for the P2MP MS-PW to the leaf TPE can be sent simultaneously.
  • the SPE After receiving the LDP packet, the SPE checks whether the SPE information carried in the explicit routing information matches the self. If the SPE matches the outgoing port, the SPE uses the explicit routing information to find the outbound port of the LDP packet. The LDP packet is forwarded out.
  • the PW segment can be bound to the corresponding LSP.
  • the multiple outgoing ports herein refer to the case where the PW segment in the P2MP MS-PW to be established is P2MP.
  • the LDP packet carries the PW segment carrying the P2MP MS-PW. LSP information, so the PW segment can be bound to the corresponding LSP according to the LSP information.
  • the leaf TPE receives the LDP packet and completes the establishment of the P2MP MS-PW.
  • the leaf TPE can establish a P2P MS-PW to the source TPE, and the leaf TPE sends data traffic to the source TPE.
  • the source TPE can simultaneously send the label required to establish the P2P MS-PW of the leaf TPE to the source TPE when the P2MP MS-PW label is sent.
  • FIG. 4 and FIG. 6 to FIG. 7 are schematic diagrams of a scenario for providing segment redundancy protection of a P2MP MS-PW.
  • TPE1 is the source node and TPE2 ⁇ TPE5 are the leaf nodes.
  • the scenario of the P2MP MS-PW segmentation protection to which the present embodiment is applicable is not limited to this.
  • the P2MP MS-PW establishment process with segment protection is shown in Figure 5, including:
  • Source TPE configuration P2MP MS-PW establishment information including AGI, SAII, explicit routing information, and active and standby information of explicit routes.
  • the active and standby information of an explicit route may be the primary and backup information of the SPE node in the explicit route.
  • the active/standby information is used to identify the active/standby status of the SPE node or the SPE node.
  • the SPE node or the SPE node in the active state is the device that is preferentially selected when forwarding data packets. Port; A device or port in standby will start working when the primary device and port fail.
  • the bearer LSP information may be configured in the source TPE in advance.
  • the group to which the AGI and the leaf TPE node belong is also configured on the leaf TPE node. And other information.
  • An LDP session is established between the source TPE and the SPE node, and between the SPE node and the leaf TPE node.
  • the source TPE sends the LDP packet, and the LDP packet carries the AGI and SAIL explicit routing information configured by the source TPE and the active and standby information of the explicit route.
  • the FEC information extended as shown in FIG. 2A and FIG. 2B can be used to carry the AGI, SAII information, explicit routing information, and explicit routing information.
  • the active/standby information of the explicit route may be carried in the explicit routing TLV in multiple manners.
  • the SPE1 active/standby field and the SPEn active/standby field are included in the explicit routing TLV, which is used to carry the active and standby information of SPE1 to SPEn.
  • SPEn represents the identity of multiple SPEs from 2 to n, where n is a natural number.
  • the explicit routing TLV includes the primary and secondary information of the SPE1 and the SPE2. If the SPE1 is included, the explicit routing TLV includes the SPE1. Active/standby information of SPE2 and SPE3.
  • the SPE node's active/standby information can be identified by using one bit. For example, when the SPE1 active/standby field and the SPEn Active/Backup field are 1, the corresponding SPE node is used. A value of 0 indicates that the corresponding SPE node is standby.
  • the active/standby information of the SPE node can also be carried in the explicit routing TLV in the manner shown in FIG. 2D.
  • the SPEn identifier (SPEn identifier) sub-tlv field is used to identify the information of each SPE node.
  • the format of the SPEn identifier sub-tlv can be as shown in Figure 2E.
  • the SPEn active/backup status field of 1 indicates that the corresponding SPE node is the primary, and the 0 indicates that the corresponding SPE node is the backup. .
  • the LDP packet may further carry LSP information of the PW segment.
  • the SPE After receiving the LDP packet, the SPE checks whether the SPE information carried in the explicit routing information matches the self. If the SPE matches, the SPE searches the outbound port of the LDP packet according to the explicit routing information. LDP packet, and based on the explicit route in the LDP packet The backup information determines the primary and backup status of the port;
  • the SPE searches for the outbound port of the LDP packet according to the explicit routing information, and then uses the egress port to forward the LDP packet, and the LDP packet is forwarded not only in the egress port where the active state is used.
  • the LDP packet is also forwarded in the outbound port.
  • the SPE determines the primary and backup status of the discovered outgoing port according to the primary and secondary information of the explicit route. The SPE preferentially selects the port in the active state when forwarding data packets without a fault; When the main port fails, it will start working.
  • the PW segment is bound to the corresponding LSP according to the LSP information of the PW segment carrying the P2MP MS-PW carried in the LD P packet, if the number of the outbound ports of the packet is multiple. set.
  • Leaf The TPE receives the message and completes the P2MP MS-PW setup, which includes establishing the PW segment for the backup.
  • the PW segment can be P2MP or P2P.
  • the source TPE further configures the primary and secondary information of the explicit route, thereby providing PW segmentation protection, P2P PW segmentation protection, and P2MP PW segmentation and P2P PW segmentation combination protection of the P2MP MS-PW.
  • This embodiment provides a method for establishing a P2MP MS-PW, which provides segment protection for a P2P MS-PW by establishing a virtual P2MP MS-PW.
  • the virtual P2MP MS-PW refers to the P W established by the P2MP MS-PW mode, but only one P2P PW between the leaf node and the source node works, and the PWs of other leaf nodes and source nodes do not forward data.
  • An example of the application scenario of the method for establishing a P2MP MS-PW is as shown in FIG. 8A.
  • TPE1 is a source node
  • TPE2 and TPE3 are leaf nodes
  • the standby TPE3 is regarded as a virtual P2MP MS-PW connected to the CE.
  • the PW between CE1 and CE2 shown in Figure 8A can be regarded as a virtual P2MP MS-PW, but the PW is still the P2P MS-PW between CE1 and CE2.
  • the process of establishing the P2MP MS-PW is as shown in FIG. 8B, and includes:
  • the TPE1 node is configured with virtual P2MP MS-PW establishment information, including AGI. SAII information, explicit routing information, and active and standby information of explicit routes.
  • the source TPE may also configure bearer LSP information in 71.
  • the TAII information is corresponding to the SAII configured in the 71, and is used to identify the destination node in the process of establishing the P2P MS-PW.
  • the P2P MS-PW is used for segmentation protection, it is necessary to ensure that the PW is established in both directions of the P2P MS-PW. Therefore, the destination information needs to be configured on the leaf node, and the destination information is also configured in the 71.
  • the TPE1 node sends an LDP packet, where the LDP packet carries the AGI, the SAII information, the explicit routing information, and the active and standby information of the explicit route.
  • the active/standby information of the explicit route may be the primary and backup information of the SPE.
  • the FEC information extended as shown in FIG. 2A and FIG. 2B can be used to carry the AGI, SAII information, explicit routing information, and explicit routing information.
  • the active and standby information of the explicit route may be carried in the explicit routing TLV in multiple manners, for example, may be carried in the explicit routing TLV in the form of FIG. 2C or FIG. 2D.
  • the LDP packet may further carry LSP information of the PW segment.
  • the SPE After receiving the LDP packet, the SPE checks whether the SPE information in the explicit routing information carried in the LDP packet matches the self. If the SPE matches the outgoing port of the LDP packet, the SPE uses the explicit routing information. The outbound port forwards the LDP packet, and determines the active/standby status of the egress port on the SPE node according to the primary and backup information of the explicit route carried in the LDP packet.
  • the SPE searches for the outbound port of the LDP packet according to the explicit routing information, and then uses the egress port to forward the LDP packet, and the LDP packet is forwarded not only in the egress port where the active state is used.
  • the LDP packet is also forwarded in the outbound port.
  • the SPE determines the primary and backup status of the discovered outbound port according to the primary and secondary information of the explicit route. When the SPE forwards the data packet, the SPE preferentially selects the port in the active state. A port in standby will start working when the primary port fails.
  • the PW segment is bound to the corresponding LSP according to the LSP information of the PW segment carrying the P2MP MS-PW carried in the LD P packet, if the number of the outbound ports of the packet is multiple. set.
  • the TPE2 and the TPE3 node receive the 4th essay and complete the virtual P2MP MS-PW establishment.
  • the PW segment of the SPE1 to TPE1 is the primary segment, and the PW segment of the SPE1 to TPE2 is the standby.
  • the TPE2 and the TPE3 send the LDP packet to the TPE1 to complete the reverse direction of the P2P MS-PW according to the explicit routing information and the active and standby information of the explicit route.
  • the explicit T2 packet is configured on the source TPE, and the primary and backup information of the explicit routing information is sent, and the LDP packet carrying the explicit routing information and the explicit routing information in the active/standby state is sent to establish a virtual P2MP. MS-PW.
  • This embodiment provides a method for establishing a P2MP MS-PW. Similar to the third embodiment, the method establishes a P2MP MS-PW with a segmentation protection function by establishing a virtual P2MP MS-PW. The difference is that the source TPE of the virtual P2MP MS-PW sends the label of the source TPE to the P2MP MS-PW of the leaf TPE and sends the label of the leaf TPE to the P2P MS-PW of the source TPE to establish a reverse P2P MS-PW. Reverse data from the leaf TPE to the source TPE.
  • the application scenario example is still shown in Figure 8A.
  • the establishment process of the P2MP MS-PW is as shown in FIG. 8C, and includes:
  • the TPE1 node is configured with virtual P2MP MS-PW establishment information, including AGI, SAII information, explicit routing information, and active and standby information of explicit routes.
  • the LSP information of the PW segment carrying the P2MP MS-PW may be further configured.
  • AGI, TAII, and the like are configured on the TPE2 and TPE3 nodes.
  • the TPEl node sends an LDP packet, where the LDP packet carries the AGI, the SAII information, the explicit routing information, and the active and standby information of the explicit route, and the LDP packet carries the TPE1 with the upstream label allocation mode and The label required for establishing the PW of TPE1 to TPE2 and the label information required to establish the PW of TPE1 to TPE3, and the PW required to establish the TPE2 i'J TPEl, and the PW of the TPE3 TPE1. Need ⁇ ; label.
  • the active/standby information of the explicit route may be the primary and backup information of the SPE.
  • the LDP packet may further carry LSP information that carries the PW segment.
  • the SPE After receiving the LDP packet, the SPE checks whether the SPE information in the explicit routing information carried in the LDP packet matches the LDP packet. If the SPE matches the outgoing port of the LDP packet, the SPE uses the explicit routing information. The outbound port forwards the LDP packet, and determines the active/standby status of the egress port on the SPE node according to the primary and backup information of the explicit route carried in the LDP packet.
  • the PW segment is bound to the corresponding LSP according to the LSP information of the PW segment carrying the P2MP MS-PW carried in the LD P packet, if the number of the outbound ports of the packet is multiple. set.
  • the TPE2 and TPE3 nodes receive 4 ,, complete the virtual P2MP MS-PW establishment, where SPE1 to TPE1 are used as the primary, SPE1 to TPE2 are reserved, and the reverse P2P MS-PW is established at the same time. .
  • the TPE1 sends the label required to establish the PW of the leaf TPE to the source TPE, and the secondary transmission of the LDP packet is avoided.
  • the P2P MS-PW segmentation protection provided by the invention is not limited thereto.
  • the invention can provide the establishment of a P2P MS-PW with segmentation protection, and can provide protection for multiple consecutive or non-contiguous segmentation P2P MS-PW segments.
  • the BGP packet carrying the explicit routing information is sent in the source TPE, and the LDP packet carrying the explicit routing information is dynamically generated, and the dynamic establishment of the P2MP MS-PW based on the explicit routing is implemented, and the complexity of introducing the BGP/IGP is avoided.
  • the signaling mechanism avoids the complicated configuration of PW inter-segment mapping during static configuration.
  • the foregoing method embodiment can be used to establish an MS-PW of any multi-hop, and further, by configuring explicit routing information and explicit routing information in the source TPE.
  • the LDP packet carrying the active and standby status of the explicit routing information and the explicit routing information is sent to implement the establishment of the P2MP MS-PW and the P2P MS-PW with the segmentation protection function.
  • FIG. 9 is a schematic structural diagram of a source TPE device according to an embodiment of the present invention.
  • the source TPE device includes: a configuration unit 91 and a transmission unit 92.
  • the configuration unit 91 is configured to configure P2MP MS-PW establishment information, where the P2MP MS-PW establishment information includes explicit routing information.
  • the explicit routing information may be, for example, an identifier of an SPE on a P2MP MS-PW to be established.
  • the establishment information further includes an auxiliary group information AGI, a source auxiliary node identifier, and a SAIL.
  • the sending unit 92 is configured to send, to the SPE, an LDP packet carrying the P2MP MS-PW setup information, so that after receiving the LDP packet, the SPE finds the foregoing according to the explicit routing information.
  • An outbound port of the LDP packet, and the LDP packet is forwarded by using the egress port.
  • the configuration unit is further configured to configure LSP information that carries the P2MP MS-PW.
  • the LDP packet further carries the LSP information.
  • the LDP file may further carry a label for establishing a PW required to transmit the traffic of the leaf TPE to the source TPE.
  • the explicit routing information configured by the configuration unit 91 further includes the active and standby information of the explicit routing, so that the SPE determines the active/standby state of the SPE according to the primary and secondary information of the SPE.
  • the configuration unit 91 can be specifically configured to configure virtual P2MP MS-PW establishment information. See the description in the above method embodiment for details.
  • the source TPE device configures the explicit routing information of the P2MP MS-PW and sends the LDP packet of the P2MP MS-PW that carries the P2MP MS-PW explicit routing information to complete the establishment of the P2MP MS-PW.
  • a large number of complicated configuration operations simplify the P2MP MS-PW establishment process and improve the efficiency of P2MP MS-PW establishment.
  • the embodiment of the present invention further provides a system for establishing a P2MP MS-PW, where the system includes a source TPE, an SPE, and a leaf TPE, where the P2MP MS-PW establishment information is configured in the source TPE, and the P2MP MS-PW is established.
  • the information includes the explicit routing information, and sends the LDP packet carrying the P2MP MS-PW setup information.
  • the SPE is configured to receive the LDP packet, and find the foregoing according to the SPE identifier in the explicit routing information.
  • the outbound port of the LDP packet, and the LDP packet is forwarded by using the egress port; the leaf TPE receives the LDP packet forwarded by the SPE.
  • the number of source TPEs, SPEs, and leaf TPEs is not limited, depending on the actual network conditions.
  • the bearer LSP information may be configured on the source TPE; the LDP packet further carries the information of the LSP of the P2MP MS-PW that is established by the active TPE, that is, the LSP information of the PW segment.
  • the LDP packet may further carry a label for establishing a PW required to transmit the leaf TPE to the source TPE data traffic.
  • the P2MP MS-PW setup information includes the active and standby information of the explicit route.
  • the SPE is further configured to determine, according to the primary and backup information of the explicit route, the forwarding operation of the LDP packet.
  • the explicit routing information may be the primary and backup information of the SPE.
  • the SPE is further configured to determine the active/standby status of the SPE or the active/standby information of the port of the SPE according to the primary and secondary information of the SPE. .
  • the leaf TPE 2 of the solid line frame in the virtual P2MP MS-PW system is in the active state, and the leaf TPE 3 in the dotted frame is in the standby state.
  • the P2MP MS-PW setup information is virtual P2MP MS-PW setup information.
  • FIG. 10 is a schematic structural diagram of another P2MP MS-PW system according to an embodiment of the present invention.
  • the P2MP MS-PW system provided by the embodiment of the present invention may also be as shown in FIG. 4 and FIG. 6 to FIG. 7.
  • the P2MP MS-PW system dynamically establishes the P2MP MS-PW.
  • the specific process of establishing a P2MP MS-PW in the system for establishing a P2MP MS-PW provided in this embodiment refer to the description in the foregoing method embodiment, and details are not described herein again.
  • the system embodiment implements dynamic establishment of P2MP MS-PW based on explicit PW routing, and avoids introducing BGP by configuring P2MP MS-PW establishment information and transmitting LDP packets carrying P2MP MS-PW establishment information in the source TPE. /IGP's complex signaling mechanism avoids the complex configuration of PW inter-segment mapping during static configuration.
  • the above method embodiments can be used for the establishment of any multi-hop MS-PW.
  • P2MP with segment protection is implemented by configuring the primary and secondary information of the explicit routing information and the explicit routing information in the source TPE, and transmitting the LDP packet carrying the explicit routing information and the explicit routing information. Establishment of MS-PW and P2P MS-PW.

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

Abstract

La présente invention se rapporte à un procédé, à un dispositif et à un système adaptés pour établir une MS-PW P2MP. Le procédé selon l'invention comprend les étapes suivantes : un bord fournisseur de terminaison (TPE) source configure des informations d'établissement de MS-PW P2MP, les informations d'établissement de MS-PW P2MP comprenant des informations de routage explicites ; le TPE source envoie un paquet de protocole de distribution avec étiquette (LDP) contenant les informations d'établissement de MS-PW P2MP, à un bord fournisseur de commutation (SPE) ; ensuite, après avoir reçu le paquet LDP, le SPE recherche un port de sortie pour le paquet LDP sur la base des informations de routage explicites, et il transfère le paquet LDP via le port de sortie trouvé.
PCT/CN2012/080490 2011-08-25 2012-08-23 Procédé, dispositif et système pour établir une ms-pw p2mp WO2013026399A1 (fr)

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