WO2013010422A1 - Procédé de configuration de tunnel de réseau en anneau à base de chemin partagé, et procédé et système de protection de réseau en anneau - Google Patents

Procédé de configuration de tunnel de réseau en anneau à base de chemin partagé, et procédé et système de protection de réseau en anneau Download PDF

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Publication number
WO2013010422A1
WO2013010422A1 PCT/CN2012/077223 CN2012077223W WO2013010422A1 WO 2013010422 A1 WO2013010422 A1 WO 2013010422A1 CN 2012077223 W CN2012077223 W CN 2012077223W WO 2013010422 A1 WO2013010422 A1 WO 2013010422A1
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WIPO (PCT)
Prior art keywords
node
state
tunnel
ring
link
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PCT/CN2012/077223
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English (en)
Chinese (zh)
Inventor
陈杰
刘国满
曲延锋
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中兴通讯股份有限公司
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Publication of WO2013010422A1 publication Critical patent/WO2013010422A1/fr

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Classifications

    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection

Definitions

  • Ring network tunnel configuration method based on shared path, ring network protection method and system
  • the present invention relates to the field of ring network protection technologies, and in particular, to a ring network tunnel configuration method based on a shared path, and a ring network protection method and system.
  • the technical problem to be solved by the embodiments of the present invention is to provide a ring network tunnel configuration method based on a shared path, a ring network protection method, and a system, to optimize the ring network configuration, and improve the performance of the protection switching.
  • a method for configuring a ring network tunnel based on a shared path including:
  • a working tunnel based on the shared path and a reverse closed protection tunnel corresponding to the working tunnel are configured with the lower ring node of the ring service as the destination node.
  • the physical ring network carrying the shared path carries multiple multi-point to point (MP2P) shared paths, and the shared path carries services from one or more nodes on the ring to the same destination node.
  • MP2P multi-point to point
  • the step of configuring the working tunnel based on the shared path with the lower ring node of the ring service as the destination node, and the reverse closed protection tunnel corresponding to the working tunnel include:
  • a ring network protection method based on a shared path comprising:
  • Each node on the ring detects a link state with the neighboring node, and when the link state change is detected, sends a state change notification message to other nodes on the ring;
  • the faulty neighboring node switches the service sent to the fault point transmitted on the working tunnel to the corresponding closed protection tunnel, and the closed protection is performed.
  • the traffic sent to the fault point transmitted on the tunnel is switched to the corresponding working tunnel; the node other than the neighboring node is transparently transmitted to the transmitted service.
  • the method further includes:
  • the method further includes:
  • the neighboring node changes the state of the node to a switch state
  • the node other than the adjacent node changes the state of the node to punch-through ( Pass through
  • the neighboring node changes the state of the node from the Switch state to the idle state (Idle) state; the node other than the adjacent node of the fault changes the state of the node. Changed from the Pass through state to the Idle state.
  • the method further includes:
  • the push-to-press (PUSH) ring network tunnel label stack mode is adopted, including: pressing (PUSH) the tunnel label of the shared path according to the running direction of the lower ring node and the working tunnel, along the The ring network forwards the packet, and the lower ring node pops up (POP) the tunnel label to perform service ringing.
  • PUSH push-to-press
  • the physical ring network carrying the shared path carries multiple multiple point-to-point (MP2P) enjoyinging a path, the shared path carrying a service from one or more nodes on the ring to a same destination node;
  • MP2P point-to-point
  • the services carried by the shared path include: a virtual private network (VPN) service of a single-layer label, a label switched path (LSP) service of a multi-layer label, and an untagged IP or Ethernet (Eth) service.
  • VPN virtual private network
  • LSP label switched path
  • Ether untagged IP or Ethernet
  • the working tunnel supports a penultimate hop pop (PHP).
  • PGP penultimate hop pop
  • a ring network tunnel configuration system based on a shared path including a path configuration module, where: the path configuration module is configured to: configure a working tunnel based on a shared path with a lower ring node of the ring service as a destination node, and The working tunnel corresponds to the opposite closed protective tunnel.
  • the path configuration module is configured to configure a working path based on the shared path and a reverse closed protection tunnel corresponding to the working tunnel by using the lower ring node of the ring service as the destination node in the following manner:
  • the closed protection tunnel from the lower ring node to the lower ring node is established in the opposite direction of the working tunnel.
  • a ring network protection system based on a shared path includes: a path configuration module, a state detection module, a status notification module, and a service switching module, where:
  • the path configuration module is configured to: configure a working tunnel based on the shared path and a reverse closed protection tunnel corresponding to the working tunnel by using the lower ring node of the ring service as the destination node; the state detecting module is configured to: Detecting the link state between the node and the neighboring node; the state notification module is configured to: when the state detecting module detects the link state change, send the state change notification message to other nodes on the ring;
  • the service switching module is configured to: when the node where the node is a faulty neighboring node, change the advertisement packet according to the received state, and learn that the link state changes from a normal state to a link or a node.
  • the service sent to the fault point transmitted on the working tunnel is switched to the corresponding closed protection tunnel, and the service sent to the fault point transmitted on the closed protection tunnel is switched to the corresponding office.
  • the node where it is located is a node other than the faulty neighboring node, transparently transmits the transmitted service.
  • the service switching module is further configured to:
  • the notification message is changed according to the received state, and when the link state is changed to a link or the node failure disappears, the switch is switched to the closed protection tunnel. The business is restored to the working tunnel.
  • the service switching module is further configured to:
  • the state of the node is changed to a through state; when the link is When the state changes to a link or node failure, the state of the node is changed from the Pass through state to the Idle state.
  • a node where the ring is configured with a shared path-based working tunnel configured with a lower ring node serving as a destination node, and a reverse closed protection tunnel corresponding to the working tunnel, where the node includes a status detection module, a status notification module, and a service switching module, wherein: the status detection module is configured to: detect a link status between the node and an adjacent node; and the status notification module is configured to: detect the status When the module detects that the link state changes, the sending status change notification message is sent to other nodes on the ring;
  • the service switching module is configured to: when the node is a faulty neighboring node, change the advertisement packet according to the received state, and when it is known that the link state changes from a normal state to a link or a node fails, Switching the service sent to the fault point transmitted on the working tunnel to the corresponding closed protection tunnel, and switching the service sent to the fault point on the closed protection tunnel to corresponding On the working tunnel; when the node is a node other than the faulty neighboring node, the transmitted service is transparently transmitted.
  • the service switching module is further configured to:
  • the notification message is changed according to the received state, and when it is learned that the link state changes to a link or the node failure disappears, the switch is switched to the closed protection tunnel. The service is restored to the working tunnel.
  • the service switching module is further configured to:
  • the state of the node is changed to a switching state; when the link state changes to a link or When the node fault disappears, the state of the node is changed from the Switch state to the idle state (Idle) state; when the node is a node other than the faulty neighboring node, when the link state changes to a link or the node fails.
  • Idle idle state
  • the embodiment of the invention provides a new WRAPPING ring network protection scheme, which can be applied to an MPLS/MPLS-TP ring network, by establishing multiple multi-point-to-point (MP2P) shared paths on one ring, on each shared path. It can carry services from one or more nodes on the ring to the ring of the same node. Compared with related technologies, it avoids the complexity of ring network tunnel configuration, improves the performance of protection switching, and optimizes configuration.
  • MP2P multi-point-to-point
  • FIG. 1 is a schematic diagram of a topology of a ring network according to the related art
  • FIG. 2 is a schematic diagram of component modules of a ring network protection system according to an embodiment of the present invention
  • 3 is a schematic diagram of fault state protection according to an embodiment of the present invention
  • 4 is a schematic diagram of a fault disappearing switch according to an embodiment of the present invention
  • FIG. 5 is a schematic flowchart of a ring network protection process according to an embodiment of the present invention.
  • This embodiment provides a ring network tunnel configuration method based on a shared path, and uses the following technical solutions:
  • a working tunnel based on the shared path and a reverse closed protection tunnel corresponding to the working tunnel are configured with the lower ring node of the ring service as the destination node.
  • the business on the ring is the business on the ring network.
  • the physical ring network carries multiple multi-point-to-point (MP2P) shared paths, and the shared path carries services from one or more nodes on the ring to the same destination node.
  • MP2P multi-point-to-point
  • the step of configuring the working tunnel based on the shared path with the lower ring node of the ring service as the destination node, and the reverse closed protection tunnel corresponding to the working tunnel include:
  • a closed protection tunnel from the lower ring node to the lower ring node is established in the opposite direction of the working tunnel.
  • the present embodiment provides a ring network protection method based on a shared path, and uses the following technical solutions:
  • Step 1 For the lower ring node of the service on the ring, configure a working tunnel and a closed protection tunnel with each lower ring node as the destination node.
  • the working tunnel (equivalent to the path) from the neighboring node of the node to the local node in each of the lower ring nodes in the clockwise or counterclockwise direction of the ring, At the same time, a closed protection tunnel is established along the opposite direction of the working tunnel. At most, a 2N working tunnel and a 2N protection tunnel need to be established.
  • Step 2 Each link on the ring (that is, each node on the ring detects the link shape of the adjacent two nodes respectively) State, including whether the link or node is faulty, initiates fault detection.
  • a node on the ring detects the link state or the state of the peer node changes from the normal state to the fault state, the direction along the ring is far away from the fault. Send a status change notification message to other nodes.
  • Step 3 After the other node on the ring receives the status change notification message, if it is a faulty neighboring node, the service sent to the fault point transmitted on the working tunnel includes: a virtual private network of a single layer label ( VPN, Virtual Private Network) service, multi-layer label LSP service, untagged IP or Ethernet (Eth) service, switch to the corresponding closed protection tunnel, and the service sent to the fault point transmitted on the closed protection tunnel Switch to the corresponding working tunnel; and other nodes on the ring perform transparent transmission of services.
  • VPN Virtual Private Network
  • LSP multi-layer label LSP service
  • Ether untagged IP or Ethernet
  • Step 4 When a node on the ring detects the link state or the state of the peer node changes from the fault state to the normal state, the state change notification message is sent to the other node along the direction of the ring away from the original fault, and the fault occurs.
  • the neighboring node detects the state change notification message that the ring fault disappears or the fault state disappears, the neighbor node detects the traffic sent or received from the closed protection tunnel to the working tunnel for transmission or reception.
  • Step 5 After receiving the packet notification from the fault state to the normal state, all the nodes on the ring become Idle state; and for the faulty neighboring node, the service transmitted by the protection tunnel is re-established. Switch to the working tunnel to prevent loss of data.
  • Step 6 When the incoming service is transmitted on the working tunnel, when the service is transmitted to the penultimate hop on the working tunnel, the outer tunnel label may be popped up (PHP), and the transmitted service is directly sent to the service. Exit the node and continue to transmit.
  • PGP popped up
  • step 3 when the ring node detects a fault or receives a state change notification message sent by the other node on the ring to the node, if it is a faulty neighbor node, then The Idle state is switched to the Switch state. For other nodes on the ring (non-fault neighbors), after receiving the state change notification message, the idle (Idle) state changes to the Pass through state.
  • This embodiment provides a ring network tunnel configuration system based on a shared path, where the system mainly includes a path configuration module, where:
  • the path configuration module is configured to: configure a working tunnel based on the shared path and a reverse closed protection tunnel corresponding to the working tunnel, with the lower ring node of the ring service as the destination node.
  • the path configuration module is configured to configure a working path based on the shared path and a reverse closed protection tunnel corresponding to the working tunnel as the destination node of the ring service in the following manner:
  • a closed protection tunnel from the lower ring node to the lower ring node is established in the opposite direction of the working tunnel.
  • the ring network protection system mainly includes the following four modules: a path configuration module 201, a status detection module 202, a status notification module 203, and a service switching module 204, where:
  • the path configuration module 201 is configured to: use each lower ring node of the ring service as a destination node, and configure a working tunnel from the adjacent node along the clockwise or counterclockwise direction of the ring to the lower ring node, and
  • the working tunnel is provided with a protective tunnel of a closed loop in the opposite direction (hereinafter referred to as a closed protective tunnel) to protect the working tunnel.
  • the state detecting module 202 is configured to: detect the state of the link by detecting a fault detection packet of the link layer between two directly connected adjacent nodes on the ring.
  • the link state is detected by detecting a continuity check and a continuity check (CC&CV, Continuity Check and Connectivity Verification) BFD (Bidirectional Forwarding Detection) message.
  • CC&CV Continuity Check and Connectivity Verification
  • BFD Bidirectional Forwarding Detection
  • the status notification module 203 is configured to: when the status detection module 202 detects a change in the link status (including a link or node failure), generate a status change notification message, along the ring Sending to the ring node from the direction of the fault until it reaches the downstream node of the fault;
  • the status change notification message includes but is not limited to: ring network automatic protection switching (R-APS,
  • the service switching module 204 is configured to: perform protection switching of the service after the change of the link state is detected or the status change notification message (such as R-APS, etc.) sent by another node is received according to the following manner:
  • the neighboring node switches the service sent to the fault point transmitted on the working tunnel to the corresponding closed.
  • the service sent to the fault point transmitted on the closed protection tunnel is switched to the corresponding working tunnel; the node other than the adjacent node of the fault transmits the transmitted service transparently;
  • the service switching module 204 is further configured to: perform a change of the state on the local node, and change from the idle state to the Switch state or from the Swtich state to the Idle state for the faulty neighboring node; In other words, it changes from the idle state to the pass through state or from the pass through state to the idle state.
  • the neighboring node changes the state of the node to the switch state, and the node other than the adjacent node changes the state of the node to the Pass through state.
  • the neighboring node changes the state of the node from the Switch state to the Idle state; the node other than the adjacent node changes the state of the node from the Pass through state to Idle state.
  • the embodiment of the present invention further provides a ring network protection system based on a shared path, where the system includes: a path configuration module, a state detection module, a state notification module, and a service switching module, where:
  • the path configuration module is configured to: configure the lower node of the ring service as the destination node based on a working tunnel of the shared path, and a reverse closed protection tunnel corresponding to the working tunnel;
  • the state detecting module is configured to: detect a link state between the node where the node is located and the neighboring node; And sending, by the state detecting module, the status change notification message to other nodes on the ring;
  • the service switching module is configured to: when the node where the node is a faulty neighboring node, change the advertisement packet according to the received state, and when the link state is changed from the normal state to the link or the node fails, Switching the service sent to the fault point transmitted on the working tunnel to the corresponding closed protection tunnel, and switching the service sent to the fault point transmitted on the closed protection tunnel to the corresponding working tunnel.
  • the transmitted service is transparently transmitted.
  • the service switching module is further configured to:
  • the notification message is changed according to the received state, and when the link state is changed to a link or the node failure disappears, the switch is switched to the closed protection tunnel. The business is restored to the working tunnel.
  • the service switching module is further configured to:
  • the state of the node is changed to a through state; when the link is When the state changes to a link or node failure, the state of the node is changed from the Pass through state to the Idle state.
  • the embodiment of the present invention further provides a node, where the ring where the node is located is configured with a shared path-based working tunnel configured by using a lower ring node of the ring service as a destination node, and a reversed corresponding to the working tunnel.
  • a closed protection tunnel the node includes: a state detection module, a state notification module, and a service switching module, where: The status detecting module is configured to: detect a link status between the node and a neighboring node; the status notification module is configured to: send a status change notification when the status detecting module detects the link status change The message is sent to other nodes on the ring;
  • the service switching module is configured to: when the node is a faulty neighboring node, change the advertisement packet according to the received state, and when it is known that the link state changes from a normal state to a link or a node fails, Switching the service sent to the fault point transmitted on the working tunnel to the corresponding closed protection tunnel, and switching the service sent to the fault point transmitted on the closed protection tunnel to the corresponding working tunnel;
  • the transmitted service is transparently transmitted.
  • the service switching module is further configured to:
  • the notification message is changed according to the received state, and when it is learned that the link state changes to a link or the node failure disappears, the switch is switched to the closed protection tunnel. The service is restored to the working tunnel.
  • the service switching module is further configured to:
  • the state of the node is changed to a switching state; when the link state changes to a link or When the node fault disappears, the state of the node is changed from the Switch state to the idle state (Idle) state; when the node is a node other than the faulty neighboring node, when the link state changes to a link or the node fails.
  • Idle idle state
  • the service carried by the shared path of the present invention may be a single-layer label VPN service (L2/L3 VPN) or a multi-layer label LSP service (IP-MPLS/MPLS-TP Tunnel, etc.), or even It is an unlabeled IP or Eth service.
  • L2/L3 VPN single-layer label VPN service
  • IP-MPLS/MPLS-TP Tunnel multi-layer label LSP service
  • It is an unlabeled IP or Eth service.
  • Step 1 Configure a working tunnel and a closed protection tunnel
  • point D, 4 such as its working tunnel is configured to be counterclockwise
  • the corresponding protective tunnel is D-E-F-A-B-C-D closed loop.
  • the working tunnel can be configured in a clockwise direction (E-F-A-B-C-D), and the corresponding protection tunnel is D-C-B-A-F-E-D.
  • Step 2 If the service 1 (the LSP service or the IP service or the PW service) and the service 2 (the LSP service, the IP service, or the PW service) enter the ring from the nodes A and B on the ring respectively, the ring is fault-free.
  • Service 1 and service 2 are pushed (PUSH) to the CBAFED on the same working tunnel at points A and B respectively.
  • the format of the encapsulated message is shown in Table 1.
  • LSP Label Indicates that the service is an LSP service. After the LSP label is swapped, the LSP label is swapped into the outer tunnel and then uploaded to the outer tunnel.
  • IP Header indicates that when the incoming link is an IP service, the IP service is directly pushed into the outer tunnel Tunnel Label and transmitted in the outer tunnel.
  • PW Label indicates that the access to the pseudowire emulation service (such as ATM, ETH, TDM, etc.) on the ingress ring node, after the local service processing (NSP) is performed on the ingress ring node, the corresponding PW is applied. Label, then press into the outer tunnel Tunnel Label and transmit it on the outer tunnel;
  • NSP local service processing
  • PDU refers to the content of the specific packaged service.
  • the node on the ring only performs the swap operation of the outer tunnel label, and after the outer label 300 is popped up on the outgoing node D, the corresponding service 1 and service 2 services are directly processed; if the LSP service is In other words, first pop up (POP) the outer Tunnel label, then inside After the LSP Label Exchange (Swap) is exported, if the IP service is used, the outer label of the POP is popped up, and the information is sent out according to the information on the header of the IP Header. If it is a PW service, it will pop up first. POP) After the outer tunnel label is popped up, the PW Label is popped up, and the emulation service is encapsulated and processed according to the PW Label.
  • POP pop up
  • the PW Label is popped up, and the emulation service is encapsulated and processed according to the PW Label.
  • Step 3 When the link E or F on the ring detects a link or node failure (fault node E or F), all the transmitted services (such as service 1, service 2, etc.) on the working tunnel are switched to the protection tunnel. (DEFABCD) is transmitted; and a status change notification message (such as R-APS, etc.) is generated and sent to other nodes on the ring along the direction of the ring away from the fault.
  • a link or node failure fault node E or F
  • Step 4 When other nodes on the ring receive the state change notification message, the non-fault neighboring node changes from the IDLE state to the pass through state; and the faulty peer node changes from the idle state to the idle state. Switching state.
  • the service 1 and service 2 services enter the ring from nodes A and B, and are first pushed to the working tunnel CBAFED for transmission; when transmitted to the node F, they are switched to the protection tunnel, and the original working tunnel label 100 is exchanged (Swap After the protection tunnel label 101 is pushed into the protection tunnel FABCDE, and transmitted to the node E, the protection tunnel label 301 is exchanged into the working tunnel label 300, and is again pushed into the working tunnel to be transmitted until it reaches the ring-out node D, and pops up. After the layer operates the tunnel label 300, the service 1 and the service 2 are directly processed.
  • Step 5 When the fault on the ring disappears, as shown in Figure 4, the link fault between F and E disappears.
  • node F or E detects that the fault disappears, F or E changes from Switching state to Idle, and The DEFABCD on the protection tunnel is restored to the CBAFED transmission on the working tunnel.
  • the node E or F that detects the state change will also generate a status change notification message with the fault disappearing, and send it along the ring away from the fault. Give other nodes on the ring.
  • Step 6 When other nodes on the ring receive the status change notification message that the fault disappears, the original Switching and Pass Through states are changed to the Idle state; and the original protected tunnel is also transmitted on the E or F node. Re-switch the transfer on the working tunnel.
  • FIG. 5 is a flowchart showing a processing procedure of a ring network protection method according to an embodiment of the present invention. As shown in FIG. 5, the process includes:
  • Step 101 Configure a working tunnel and a closed protection tunnel as a destination node of the ring service (also referred to as an egress node) of the ring service.
  • Step 102 A fault detection packet is periodically sent on each link.
  • Step 103 Determine whether a link state change is detected. If yes, go to step 104. Otherwise, go to step 105.
  • Step 104 Immediately generate a state change notification message and send it to other nodes on the ring.
  • Step 105 Periodically send a status advertisement message.
  • Step 106 The node on the ring detects or receives another status change notification message.
  • Step 107 Determine whether the link state change changes from the normal state to the fault state. If yes, go to step 108. Otherwise, go to step 109.
  • each node is set to the Switching or Pass through state, and step 110 is performed.
  • each node is set to the Idle state.
  • Step 110 Perform a handover of a service delivery tunnel.
  • modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module. Thus, the invention is not limited to any particular hardware and software. Combine.
  • the embodiment of the invention provides a new WRAPPING ring network protection scheme, which can be applied to an MPLS/MPLS-TP ring network, by establishing multiple multi-point-to-point (MP2P) shared paths on one ring, on each shared path. It can carry services from one or more nodes on the ring to the ring of the same node. Compared with related technologies, it avoids the complexity of ring network tunnel configuration, improves the performance of protection switching, and optimizes configuration. Therefore, the present invention has strong industrial applicability.
  • MP2P multi-point-to-point

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Abstract

L'invention porte sur un procédé de configuration de tunnel de réseau en anneau à base de chemin partagé, et un procédé et un système de protection de réseau en anneau, utilisant le nœud hors anneau d'un service sur anneau comme nœud de destination, et configurant un tunnel de travail à base de chemin partagé et un tunnel de protection fermé en sens inverse correspondant au tunnel de travail. Selon la solution technique, une pluralité de chemins partagés MP2P sont établis sur un même anneau, et chaque chemin partagé peut transporter les services entrant dans l'anneau par un ou plusieurs nœuds et sortant de l'anneau par un même nœud, ce qui évite la complexité de configuration de tunnel de réseau en anneau, améliore les performances de commutation de protection et optimise la configuration.
PCT/CN2012/077223 2011-07-15 2012-06-20 Procédé de configuration de tunnel de réseau en anneau à base de chemin partagé, et procédé et système de protection de réseau en anneau WO2013010422A1 (fr)

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CN201110198332.1A CN102882780B (zh) 2011-07-15 2011-07-15 基于共享路径的环网隧道配置方法、环网保护方法及系统

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