WO2012055269A1 - Procédé, appareil et système pour la commutation de protection automatique d'un anneau de protection de partage - Google Patents

Procédé, appareil et système pour la commutation de protection automatique d'un anneau de protection de partage Download PDF

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Publication number
WO2012055269A1
WO2012055269A1 PCT/CN2011/077370 CN2011077370W WO2012055269A1 WO 2012055269 A1 WO2012055269 A1 WO 2012055269A1 CN 2011077370 W CN2011077370 W CN 2011077370W WO 2012055269 A1 WO2012055269 A1 WO 2012055269A1
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Prior art keywords
node
ring
aps
shared
segment
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PCT/CN2011/077370
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English (en)
Chinese (zh)
Inventor
谢密
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中兴通讯股份有限公司
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Publication of WO2012055269A1 publication Critical patent/WO2012055269A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/42—Loop networks
    • H04L12/437—Ring fault isolation or reconfiguration

Definitions

  • the present invention relates to the field of communications, and in particular, to an automatic protection switching method, apparatus and system for sharing a guard ring. Background technique
  • each node is configured with a Maintenance Entity Point (MEP), and a T-MPLS multiplex section layer (T-MPLS Section Layer, TMS) is configured between adjacent MEPs.
  • MEP Maintenance Entity Point
  • TMS T-MPLS Section Layer
  • a multiplex section manages a set of passing tunnels.
  • the convergence ring and the access ring use independent physical links, and the aggregation ring and the access ring are respectively configured corresponding to the nodes E and F.
  • TMS detection TMS1 ( ⁇ , F) and TMS2 ( ⁇ , F).
  • the adjacent node of the faulty node or the faulty node sends an Automatic Protection Switching (APS) packet to the peer, and the APS packet is transmitted from the eastbound short path and the westbound longpath to the opposite end.
  • the format of the information frame is as shown in Figure 2.
  • the APS packet includes a label value field, a function type field, and an automatic protection switching information field.
  • the automatic protection switching information field in the APS packet is shown in Figure 3, including the source node identifier, the destination node identifier, the bridge request, and the reserved field.
  • the main purpose of the present invention is to provide an automatic protection switching method, device and system for sharing a protection ring, which realizes that the access ring and the aggregation ring share physical links and share MEPs between nodes that are dual-homed. And TMS detects automatic protection switching when a fault occurs.
  • the present invention provides an automatic protection switching method for a shared protection ring, which is used for an access ring and an aggregation ring with a shared segment, including:
  • the shared protection ring node When the shared protection ring node is located in the segment or the neighboring node is faulty, the shared protection ring node sends an automatic protection switching request APS packet to the peer end, and the APS packet includes the destination node identifier and the ring identifier (ID);
  • the shared segment node When the APS packet arrives at the shared segment node, the shared segment node forwards the APS packet to the peer end according to the APS packet and the APS packet forwarding entry of the local node to perform automatic protection switching.
  • the sending, by the shared protection ring node, the APS packet to the peer end includes:
  • the shared segment node When the faulty segment or the faulty node is a shared segment or a shared segment node, the shared segment node sends APS packets of the access ring and the aggregation ring respectively.
  • the shared segment node forwards the APS to the peer according to the APS packet and the APS packet forwarding entry of the local node, including:
  • the shared segment node acquires a destination node identifier and a ring identifier of the APS packet
  • the APS packet is transparently transmitted according to the result of the entry in the APS packet forwarding entry.
  • the invention also provides a shared protection ring node, which is configured to send an automatic protection switching request APS message to the opposite end when the fault occurs in the segment or the adjacent node, where the APS message includes the destination node identifier and the ring identifier.
  • the shared protection ring node is a shared segment node
  • the APS 4 message of the access ring and the aggregation ring are respectively sent.
  • the present invention also provides a shared segment node, which is configured to forward an APS message to a faulty node or a faulty node according to the APS packet and the APS packet forwarding entry of the local node when the APS packet arrives.
  • the opposite end of the adjacent node to perform automatic protection switching.
  • the shared segment node specifically includes:
  • An obtaining module configured to obtain a destination node identifier and a ring identifier of the APS packet
  • the query module is configured to query the APS text forwarding entry of the local node according to the destination node identifier and the ring identifier of the APS packet.
  • the transparent transmission module is configured to transparently transmit the APS packet according to the result of the entry in the APS packet forwarding entry.
  • the present invention also provides an automatic protection switching system for a shared protection ring, which is used for an access ring and an aggregation ring with a shared segment, including: a shared protection ring node and a shared segment node;
  • the shared protection ring node is configured to send an automatic protection switching request APS packet to the peer end when the fault occurs in the segment or the neighboring node, where the APS packet includes the destination node identifier and the ring identifier;
  • the APS packet arrives, the APS packet is forwarded to the peer according to the APS packet and the APS packet forwarding entry of the local node to perform automatic protection switching.
  • the shared protection ring node is configured to send an automatic protection switching request APS message to the opposite end when the segment or the neighboring node fails, and the APS message includes the destination node identifier and the ring identifier.
  • the shared protection ring node is a shared segment node
  • the APS 4 message of the access ring and the aggregation ring are respectively sent.
  • the shared segment node is configured to: when the APS packet arrives, forward the APS packet to the opposite end of the faulty node or the adjacent node of the faulty node according to the APS packet and the APS packet forwarding entry of the local node. For automatic protection switching.
  • the shared segment node specifically includes:
  • An obtaining module configured to obtain a destination node identifier and a ring identifier of the APS packet
  • the query module is configured to query the APS text forwarding entry of the local node according to the destination node identifier and the ring identifier of the APS packet.
  • the transparent transmission module is configured to transparently transmit the APS packet according to the result of the entry in the APS packet forwarding entry.
  • the automatic protection switching method, device and system for sharing a protection ring provided by the present invention, when a physical link, a shared MEP, and a TMS are shared between an access ring and an aggregation ring in a dual-homed access node, and a failure occurs, By sending the APS packet carrying the ring identifier, the APS packet can be successfully reached to the destination node for automatic protection switching. This eliminates the need for an independent physical link between the access ring and the aggregation ring, which saves system resources.
  • FIG. 1 is a schematic structural diagram of an existing shared protection ring system
  • FIG. 2 is a schematic structural diagram of an information frame of an existing APS message
  • FIG. 3 is a schematic structural diagram of an automatic protection switching data information in an existing APS packet
  • FIG. 4 is a schematic flowchart of an automatic protection switching method of a shared protection ring according to an embodiment of the present invention
  • FIG. 6 is a schematic structural diagram of automatic protection switching data information in an APS packet according to the present invention
  • FIG. 7 is a schematic diagram of an APS packet forwarding entry according to the present invention
  • FIG. 8 is another schematic diagram of an APS packet forwarding entry according to the present invention.
  • FIG. 9 is a schematic flowchart of a method for forwarding an APS packet by a shared segment node in an embodiment of an automatic protection switching method for a shared protection ring according to an embodiment of the present invention
  • FIG. 10 is a schematic structural diagram of an embodiment of a shared segment node according to the present invention.
  • FIG. 11 is a schematic structural diagram of an automatic protection switching system of a shared protection ring according to the present invention. The implementation, functional features and advantages of the objects of the present invention will be further described in conjunction with the embodiments herein.
  • the invention provides an automatic protection switching method, device and system for sharing a protection ring,
  • the access ring and the aggregation ring share the physical link, the shared MEP, and the TMS between the nodes that are connected to each other.
  • the APS packet can be successfully sent to the destination node by sending the APS packet carrying the ring identifier.
  • Automatic protection switching Referring to FIG. 4, an embodiment of an automatic protection switching method for a shared protection ring of the present invention is provided, which is used for an access ring and an aggregation ring with a shared segment, and includes the following steps:
  • Step S101 When the segment where the shared protection ring node is located or the neighboring node is faulty, the shared protection ring node sends an APS packet to the peer end, where the APS packet includes the destination node identifier and the ring identifier.
  • each node on the ring is configured with MEP
  • TMS detection is configured between adjacent MEPs
  • a multiplex section manages a group of tunnels that pass through.
  • the access ring and the aggregation ring are in the The shared physical link is shared between the nodes that are dual-homed, and the configured MEP and TMS are shared.
  • the faulty node or the neighboring node of the faulty node sends an APS packet to the peer.
  • the nodes B and C are the opposite ends, and the node B passes the path.
  • BAFEDC sends APS message to node C or node C sends APS message to node B through path CDEFAB.
  • a node fails two adjacent nodes of the faulty node are opposite each other.
  • the format of the information frame of the APS packet is as shown in FIG. 6, which includes the destination node identifier, the source node identifier, the bridging request, and the ring identifier.
  • the reserved field extension function in the APS information frame may be used to reserve the original reserved field. It is defined as a ring identifier to implement the automatic protection switching function of the shared physical link after the access ring is dual-homed to the aggregation ring.
  • the non-faulty node VIII, F, E, and D compare the destination node identifier and the local node identifier in the APS packet. When the destination node is not the local node, the destination node identifier and ring in the APS packet are received. The identifier determines the egress and is transparently transmitted to the downstream node. For the faulty node B or the node C, the destination node is the local node, the APS packet is terminated, and the service is automatically protected and switched according to the content of the APS packet.
  • Step S102 When the APS packet passes through the shared segment node, the shared segment node is based on the APS. The packet and the APS packet forwarding entry of the local node forward the APS packet to the peer end for automatic protection switching.
  • the shared segment nodes E and F of the access ring and the aggregation ring maintain a preset APS packet forwarding entry.
  • the key value of the APS packet forwarding entry is the TMS and ring identifier.
  • the result is The TMS, that is, the APS packet forwarding entry is obtained according to the destination node identifier and the ring identifier in the APS packet, and the APS packet is transparently transmitted out according to the corresponding port in the TMS in the result of the entry.
  • node E maintains two APS 4 ⁇ forwarding entries, where TEM ( E, F ) indicates that the source node is node E and the destination node is node? .
  • the node E receives the APS packet in the aggregation ring from the port node F corresponding to the TMS (E, F), it will transparently transmit the APS packet to the port node D corresponding to the TMS (D, E); if the node E is from the TMS ( E, F) The corresponding port node F receives the APS packet in the access ring, and transparently transmits the APS packet to the port node D corresponding to the TMS (E, H).
  • the shared segment node can transparently transmit the APS packet to the destination node through the destination node identifier and the ring identifier of the APS packet and the maintained APS packet forwarding entry.
  • the automatic protection switching method for the shared protection ring is provided by the present invention.
  • the access ring and the aggregation ring share the segment between the nodes that are dual-homed, share the MEP and TMS, and the segment or node fails,
  • the APS packet of the ring identifies the APS packet to the destination node for automatic protection switching.
  • the access ring and the aggregation ring do not need to use independent physical links, which saves system resources.
  • the step S101 may include: when the faulty segment or the faulty node is a shared segment or a shared segment node, the shared segment node respectively sends an APS packet of the access ring and the aggregation ring.
  • step S102 may include:
  • Step S1021 The shared segment node obtains the destination node identifier and the ring identifier of the APS packet.
  • Step S1022 Query the APS packet forwarding entry of the local node according to the destination node identifier and the ring identifier of the APS packet.
  • Step S1023 Transparently transmit an APS packet according to the result of the entry in the APS packet forwarding entry.
  • the present invention also provides an embodiment of the shared protection ring node of the present invention, which is configured to send an automatic protection switching request APS message to the opposite end when the node or the adjacent node fails, and the APS message includes the destination node identifier and the ring identifier. .
  • each node on the ring is configured with a MEP, and TMS detection is configured between adjacent MEPs, and one multiplex section manages a group of tunnels that pass through, at the dual-homing access point.
  • the access ring and the aggregation ring share a physical link, that is, a shared segment, between the nodes that are dual-homed, and share the configured MEP and TMS detection.
  • the shared protection ring node After detecting the fault of the segment or the fault of the neighboring node, the shared protection ring node sends the APS packet to the peer end. For example, when the BC segment of the aggregation ring fails, the nodes B and C are the opposite ends, and the node B passes the path BAFEC to the node. C sends an APS message or node C sends an APS message to the Node B through the path CEFAB. When a node fails, two adjacent nodes of the faulty node are opposite each other.
  • the format of the information frame of the APS packet is as shown in FIG. 6, which includes the destination node identifier, the source node identifier, the bridging request, and the ring identifier.
  • the reserved field extension function in the APS information frame may be used to reserve the original reserved field. It is defined as a ring identifier to implement the automatic protection switching function of the shared physical link after the access ring is dual-homed to the aggregation ring.
  • the node A, F, and E of the non-faulty segment compares the destination node identifier with the local node identifier in the APS packet. When the destination node is not the local node, it determines the destination node identifier and ring identifier in the APS packet. The egress is transmitted to the downstream node. For the faulty node B or the node C, the destination node is the local node, the APS packet is terminated, and the service is automatically protected according to the content of the APS packet. Protected and replaced.
  • the shared segment nodes E and F of the access ring and the aggregation ring maintain a preset APS packet forwarding entry.
  • the key value of the APS packet forwarding entry is the TMS and ring identifier.
  • the result is The TMS, that is, the APS packet forwarding entry is obtained according to the destination node identifier and the ring identifier in the APS packet, and the APS packet is transparently transmitted out according to the corresponding port in the TMS in the result of the entry.
  • node E maintains two APS 4 ⁇ forwarding entries, where TEM ( E, F ) indicates that the source node is node E and the destination node is node? .
  • the node E receives the APS packet in the aggregation ring from the port node F corresponding to the TMS (E, F), it will transparently transmit the APS packet to the port node D corresponding to the TMS (D, E); if the node E is from the TMS ( E, F) The corresponding port node F receives the APS packet in the access ring, and transparently transmits the APS packet to the port node D corresponding to the TMS (E, H).
  • the shared segment node can transparently transmit the APS packet to the destination node through the destination node identifier and the ring identifier of the APS packet and the maintained APS packet forwarding entry.
  • the present invention provides a shared protection ring node.
  • the access ring and the aggregation ring share a segment between the nodes that are dual-homed, share the MEP and TMS, and the segment or neighbor node fails, the ring is sent.
  • the identified APS packets enable the APS packets to reach the destination node for automatic protection switching.
  • the access ring and the aggregation ring do not need to use independent physical links, which saves system resources.
  • the shared protection ring node may be specifically configured to: when the shared protection ring node is a shared segment node, respectively send the APS packet of the access ring and the aggregation ring.
  • the nodes E and F initiate an APS automatic protection switching request.
  • the nodes E and F send APS packets to the access ring and the aggregation ring respectively: APS (E, F; Ringl) and APS (F , E; Ring2).
  • the present invention also provides an embodiment of a shared segment node of the present invention, which is used for carrying an APS carrying a ring identifier.
  • the APS packet is forwarded to the peer of the faulty node or the neighboring node of the faulty node according to the APS packet and the APS packet forwarding entry of the local node to perform automatic protection switching.
  • each node on the ring is configured with a MEP, and TMS detection is configured between adjacent MEPs, and one multiplex section manages a group of tunnels that pass through, at the dual-homing access point.
  • the access ring and the aggregation ring share a physical link, that is, a shared segment, between the nodes that are dual-homed, and share the configured MEP and TMS detection.
  • the faulty node or the neighboring node of the faulty node sends an APS packet to the peer.
  • the nodes B and C are the opposite ends, and the node B passes the path.
  • the BAFEC sends the APS message to the Node C or the Node C sends the APS message to the Node B through the path CEFAB.
  • a node fails two adjacent nodes of the faulty node are opposite each other.
  • the format of the information frame of the APS packet is as shown in FIG. 6, which includes the destination node identifier, the source node identifier, the bridging request, and the ring identifier.
  • the reserved field extension function in the APS information frame may be used to reserve the original reserved field. It is defined as a ring identifier to implement the automatic protection switching function of the shared physical link after the access ring is dual-homed to the aggregation ring.
  • the node A, F, and E of the non-faulty segment compares the destination node identifier with the local node identifier in the APS packet. When the destination node is not the local node, it determines the destination node identifier and ring identifier in the APS packet. The egress is transparently transmitted to the downstream node. For the faulty node B or the node C, the destination node is the local node, the APS packet is terminated, and the service is automatically protected and switched according to the content of the APS packet.
  • the shared segment nodes E and F of the access ring and the aggregation ring maintain a preset APS packet forwarding entry.
  • the key value of the APS packet forwarding entry is the TMS and ring identifier.
  • the result is The TMS, that is, the APS packet forwarding entry is obtained according to the destination node identifier and the ring identifier in the APS packet, and the APS packet is transparently transmitted out according to the corresponding port in the TMS in the result of the entry.
  • node E maintains two APS 4 ⁇ forwarding entries, where TEM ( E, F ) indicates that the source node is node E and the destination node is node? .
  • node E is from TMS (E, F)
  • the corresponding port node F receives the APS packet in the aggregation ring, and transparently transmits the APS packet to the port node D corresponding to the TMS (D, E); if the node E is from the port node corresponding to the TMS (E, F)
  • F Upon receiving the APS packet in the access ring, F will transparently transmit the APS packet to the port node D corresponding to the TMS (E, H).
  • the shared segment node can transparently transmit the APS packet to the destination node through the destination node identifier and the ring identifier of the APS packet and the maintained APS packet forwarding entry.
  • the APS packet is forwarded to the destination node for automatic protection switching, so that the APS packet is forwarded to the destination node.
  • Access rings and aggregation rings eliminate the need for separate physical links, saving system resources.
  • the shared segment node may include: an obtaining module 21, configured to acquire a destination node identifier and a ring identifier of the APS packet;
  • the querying module 22 is configured to query the APS 4 ⁇ forwarding entry of the node according to the destination node identifier and the ring identifier of the APS packet.
  • the transparent transmission module 23 is configured to transparently transmit the APS packet according to the result of the entry in the APS packet forwarding entry.
  • an embodiment of an automatic protection switching system for a shared protection ring of the present invention is provided, which is used for an access ring and an aggregation ring with a shared segment, including:
  • the shared protection ring node 10 is configured to send an automatic protection switching request APS message to the opposite end when the segment or the neighboring node fails, the APS file includes the destination node identifier and the ring identifier, and the shared segment node 20 is used as the APS.
  • the APS packet is forwarded to the peer according to the APS packet and the APS packet forwarding entry of the local node to perform automatic protection switching.
  • the shared protection ring node 10 and the shared segment node 20 are the same as the shared protection ring node of the above embodiment and the shared segment node 20 shown in FIG. 10, and the working principle thereof will not be described herein.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)

Abstract

L'invention concerne un procédé pour la commutation de protection automatique (APS) d'un anneau de partage, qui est utilisé pour un anneau d'accès et un anneau de convergence avec un segment de partage. Le procédé comprend les étapes suivantes : lorsque le segment dans lequel est situé un nœud de protection de partage ou un nœud adjacent échoue, le nœud de protection de partage transmet un message de demande d'APS à un nœud opposé, le message d'APS comprenant une identification de nœud destinataire et une identification d'anneau ; lorsque le message d'APS arrive au niveau d'un nœud de segment de partage, le nœud de segment de partage transfère le message d'APS au nœud opposé selon le message d'APS et l'élément de table de transfert de messages d'APS du présent nœud pour l'APS. L'invention concerne également un appareil et un système correspondants. Le procédé, l'appareil et le système pour l'APS d'un anneau de partage de la présente invention, réalisent une APS lorsque l'anneau d'accès et l'anneau de convergence partagent une liaison physique, et partagent le point d'entité de maintenance (MEP) et la détection de couche de section T-MPLS (TMS) entre les nœuds à double retour et la défaillance se produit.
PCT/CN2011/077370 2010-10-27 2011-07-20 Procédé, appareil et système pour la commutation de protection automatique d'un anneau de protection de partage WO2012055269A1 (fr)

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CN101984592A (zh) * 2010-10-27 2011-03-09 中兴通讯股份有限公司 一种共享保护环的自动保护倒换方法、装置和系统
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