WO2012130039A1 - Procédé et système de transmission destinés à des services par anneaux croisés - Google Patents

Procédé et système de transmission destinés à des services par anneaux croisés Download PDF

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Publication number
WO2012130039A1
WO2012130039A1 PCT/CN2012/072262 CN2012072262W WO2012130039A1 WO 2012130039 A1 WO2012130039 A1 WO 2012130039A1 CN 2012072262 W CN2012072262 W CN 2012072262W WO 2012130039 A1 WO2012130039 A1 WO 2012130039A1
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WIPO (PCT)
Prior art keywords
node
ring
cross
link
inflow
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PCT/CN2012/072262
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English (en)
Chinese (zh)
Inventor
刘国满
Original Assignee
中兴通讯股份有限公司
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Publication of WO2012130039A1 publication Critical patent/WO2012130039A1/fr

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Classifications

    • 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
    • H04L41/06—Management of faults, events, alarms or notifications

Definitions

  • the present invention relates to the field of communications, and in particular to a method and system for transmitting a cross-ring service.
  • BACKGROUND In PTN Packet Transport Network
  • all ring network protections are based on single-ring service protection.
  • Wrapping and Steering protection in G8132 is to use link layer fault detection and R-APS (Ring- Automatic Protection Switching) mechanism to perform services when one or more faults occur in the ring. Recovery and protection.
  • R-APS Ring- Automatic Protection Switching
  • the cross-ring service refers to the link (preferably, the link here is equivalent to the path).
  • the ingress node and the egress node of (Path) are not in the same ring, that is, the ingress node 1 and the egress node 5 are in the ring Ring1 and the ring Ring2, respectively.
  • the node 2 will feed back the link (2-3) fault information to the node 1 by wrapping (loopback).
  • the node 1 will The service is forwarded to the downstream node 3 of the fault according to the protection path (1-6-7-8-3) inside the single ring 1.
  • the link Link (3-8) fails at the same time, the node 1 cannot follow the service.
  • the protection path (1-6-7-8-3) inside the single ring 1 is forwarded to the downstream node 3 of the fault, so that the protection path forwarding is unsuccessful, resulting in protection failure. It can be seen that in the prior art, since there is only a protection path inside the single ring, on the working link (for example, Link (1-2-3)) and the protection link (Link (1-6-7-) 8-3)) When a failure occurs at the same time, the cross-ring service cannot be restored.
  • the present invention provides a method and system for transmitting a cross-ring service, which solves the problem that the protection link recovery method in a single ring is only used in the prior art, and when the working link and the protection link fail simultaneously, the cross-ring cannot be performed.
  • a method for transmitting a cross-ring service including: configuring a cross-ring protection link between an ingress node and an egress node of a cross-ring transmission service, where the inflow node passes at least two a ring is connected to the egress node, the cross-ring protection link is connected between the inflow node and the egress node by a node of the at least two rings; detecting one ring of the at least two rings Working link and corresponding Whether the protection link is faulty; if the working link and the corresponding protection link in one of the at least two rings fail, the inflow node passes through the cross-ring protection link The outbound node transmits the cross-ring service.
  • the inflow node is a start node that sends a cross-ring service or is connected to the start node; the egress node is a destination node that receives the cross-ring service or is connected to the destination node. Detecting, by the following detecting step, whether the working link and the corresponding protection link in one of the at least two rings are faulty: the first one of the first rings in the at least two rings The second cross node sends a fault detection message to the peer through the working link in the first ring and the corresponding protection link, where the first cross node and the second cross node are in the first ring.
  • the step of the inflow node transmitting the cross-ring service to the outbound node by using the cross-ring protection link includes: The first cross node is one of the inflow node and the outflow node, and the second cross node sends a fault indication message to the inflow through a second ring adjacent to the first ring.
  • the inflow node transmits the cross-ring service to the outbound node through the cross-ring protection link.
  • the step of the inflow node transmitting the cross-ring service to the outbound node by using the cross-ring protection link further includes: If the first cross node and the second cross node are not the inflow node and the outflow node, the second cross node will indicate a fault through a second ring adjacent to the first ring.
  • the first cross node Transmitting a message to one of the inflow node and the outflow node, the first cross node transmitting a fault indication message to the inflow node and the third ring by a third ring adjacent to the first ring The other one of the outbound nodes, wherein the fault indication message is used to indicate that the working link and the corresponding protection link in the first ring are faulty; after receiving the fault indication message, The inflow node transmits the cross-ring service to the outbound node through the cross-ring protection link.
  • the step of the inflow node transmitting the cross-ring service to the outbound node by using the cross-ring protection link further includes: If the first cross node is one of the inflow node and the outflow node, and it is determined that the ring of the other of the inflow node and the outflow node is faulty, the inflow node and the The other of the outbound nodes transmits the cross-ring traffic through the cross-ring protection link and one of the ingress node and the outbound node.
  • the step of the inflow node transmitting the cross-ring service to the outbound node by using the cross-ring protection path further includes: One of the inflow node or the outflow node detects that the cross-loop working path between the inflow node and the outflow node fails, and after delaying for a predetermined period of time, there is still a fault on the cross-loop working path, and the inflow node passes the The cross-ring protection path transmits the cross-ring service to the outbound node.
  • Each of the at least two loops simultaneously performs the detecting step.
  • a transmission system for a cross-ring service including: a configuration unit, configured to configure a cross-ring protection link between an ingress node and an egress node of a cross-ring transmission service, where The inflow node is connected to the outflow node by at least two rings, and the cross-ring protection link is connected between the inflow node and the outflow node by a node of the at least two rings; the detecting unit is set to Detecting whether a working link and a corresponding protection link in one of the at least two rings fail; the transmitting unit is configured as a working link and corresponding in one of the at least two rings When the protection link fails, the cross-ring service is transmitted from the inflow node to the outbound node through the cross-ring protection link.
  • the detecting unit includes: a first sending module, configured to: in detecting whether a working link and a corresponding protection link in one of the at least two rings are both faulty, in the at least two rings
  • the first cross node and the second cross node in the first ring send a fault detection message to the other party through the working link in the first ring and the corresponding protection link, or the ingress node and the outflow node are in the cross-loop working chain.
  • the transmitting unit includes: a second sending module, configured to: after determining that both the working link and the corresponding protection link in the first ring fail, when the first intersecting node is the inflow node and And when the one of the outflow nodes sends the fault indication message to the other one of the inflow node and the outflow node by using the second ring adjacent to the first ring,
  • the fault indication message is used to indicate that the working link and the corresponding protection link in the first ring are faulty
  • the first transmission module is configured to: after receiving the fault indication message, pass
  • the cross-ring protection link transmits a cross-ring service from the ingress node to the outbound node.
  • the transmitting unit further includes: a third sending module, configured to: after determining that both the working link and the corresponding protection link in the first ring fail, when the first cross node and the second Cross nodes are not Transmitting the node to the inflow node and/or the outflow node, causing the second cross node to send a fault indication message to the inflow node and the outflow node by using a second ring adjacent to the first ring And causing the first cross node to send a fault indication message to the other one of the inflow node and the outflow node by using a third ring adjacent to the first ring, where the fault The indication message is used to indicate that the working link and the corresponding protection link in the first ring are faulty; the second transmission module is configured to: after receiving the fault indication message, pass the cross-ring protection A link transmits a cross-ring service from the ingress node to the outbound node.
  • a third sending module configured to: after receiving the fault indication message, pass the cross-ring protection A link
  • the transmission unit further includes: a default module, configured to: after determining that the working link and the corresponding protection link in the first ring are both faulty, when the first cross node is the inflow node and the When one of the outflow nodes is determined, and it is determined that the ring of the other of the inflow node and the outflow node is faulty, the other of the inflow node and the outflow node is passed through the crossover ring
  • the protection link transmits the cross-ring service with one of the ingress node and the outbound node.
  • the transmission unit is further configured to: after detecting that both the working link and the corresponding protection link in the first ring fail, detecting a fault on the cross-loop working path between the inflow node and the outflow node And if there is still a fault after delaying for a predetermined period of time, the inflow node is caused to transmit the cross-ring service to the outbound node by using the cross-ring protection path.
  • the detecting unit is further configured to detect whether a working link and a corresponding protection link of each of the at least two rings are faulty.
  • a cross-ring protection link is configured for the service that is transmitted across the ring, so that when the working link and the corresponding protection link in the single ring are faulty and the cross-ring protection link is normal, the The above-mentioned cross-ring protection link is used to continue the transmission of the service, and solves the problem that the single-ring protection recovery method cannot be used to recover the cross-ring service in the prior art, and then the cross-ring service transmission and the work chain in one ring are performed. When the road and the protection link fail at the same time, the correct transmission of the cross-ring service can also be guaranteed.
  • FIG. 1 is a schematic diagram of a wrap protection example according to the related art
  • FIG. 2 is a block diagram showing a preferred structure of a transport system for cross-ring services according to an embodiment of the present invention
  • FIG. 3 is a cross-ring service according to an embodiment of the present invention.
  • FIG. 4 is another structural block diagram of a transmission system of a cross-ring service according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of transmission of multiple cross-ring services in a single ring in a transmission method of a cross-ring service according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of transmission of a cross-ring service in a single-ring failure protection cross-ring service according to an embodiment of the present invention
  • FIG. 7 is a transmission method of a cross-ring service according to an embodiment of the present invention
  • FIG. 8 is a schematic diagram of transmission of a cross-ring service failure cross-ring service according to a transmission method of a cross-ring service according to an embodiment of the present invention
  • FIG. 9 is a multi-ring interconnection single ring transmission method of a cross-ring service according to an embodiment of the present invention
  • FIG. 10 is a schematic diagram of transmission of a multi-ring interconnection multi-ring multi-location fault protection cross-ring service according to an embodiment of the present invention
  • FIG. 11 is a transmission diagram of a cross-ring service according to an embodiment of the present invention
  • FIG. 12 is a cross-ring industry according to an embodiment of the present invention.
  • Another flowchart transmission method BEST MODE FOR CARRYING OUT THE INVENTION
  • FIG. 2 is a block diagram showing a preferred structure of a transmission system for a cross-ring service according to an embodiment of the present invention, including:
  • the configuration unit 202 is configured to configure a cross-ring protection link between the inflow node and the outflow node of the cross-ring transmission service, where the inflow node is connected to the egress node through at least two rings, and the cross-ring protection link passes at least two The nodes in the ring are connected between the ingress node and the outflow node; 2)
  • the detecting unit 204 is configured to detect whether a working link and a corresponding protection link in one of the at least two rings (ie, inside the ring) are faulty, wherein, in the initial state, the inflow node Transmitting a cross-ring service to the egress node through a working link in each of the at least two rings;
  • the transmitting unit 206 is configured to transmit the cross-ring service from the ingress node to the outbound node by using the cross-ring protection link when both the working link and the corresponding protection link in one of the at least two rings fail.
  • the working unit of the transmitting unit 206 in one of the at least two rings
  • the switchover of the cross-ring link is implemented, that is, the cross-ring service is transmitted from the ingress node to the outbound node through the cross-ring protection link.
  • the connection relationship between the above configuration unit 202, the detection unit 204, and the transmission unit 206 can be as shown in FIG. 2.
  • the cross-ring protection link is configured for the service that is transmitted across the ring, so that when the working link and the corresponding protection link in the single ring are detected to be faulty, the above-mentioned cross-ring protection chain may be used.
  • the path to continue the transmission of the service solves the problem that the single-ring protection recovery method cannot be used to recover the cross-ring service in the prior art, and then the cross-ring service transmission and the working link and the protection link in one ring are simultaneously In the event of a failure, the correct transmission of the cross-ring service is also guaranteed.
  • the ingress node may be a starting node for transmitting the cross-ring service or connected to the starting node; the egress node may be a destination node that receives the cross-ring service or is connected to the destination node.
  • the location of the ingress node and the outflow node are further illustrated so that the present invention can be applied to different network topologies.
  • the ingress node in this embodiment may be a cross-ring start node (such as node 1 shown in FIG. 5), or may be an intermediate forwarding node between the cross-ring service rings (node 3 shown in FIG. 5). It can also be a node connected to the starting node of the cross-ring service (node A as shown in Figure 11).
  • the outbound node of the present invention may be the destination node of the last ring (node 5 as shown in FIG. 5), or may be an intermediate forwarding node between the rings (node 5 shown in FIG. 9).
  • a node that is connected to a business destination node node D as shown in Figure 11).
  • the detecting unit 204 includes: a first sending module 2041 and a first determining module 2042 connected in sequence.
  • the first sending module 2041 and the first determining module 2042 may detect whether the working link and the corresponding protection link in one of the at least two rings are faulty by detecting: detecting one of the at least two rings During a process in which the working link and the corresponding protection link in the ring are both faulty, the first sending module 2041 passes the first cross node and the second cross node in the first ring of the at least two rings through the first ring.
  • the working link and the corresponding protection link send a fault detection message to the other party, where the first cross node and the second cross node are nodes shared by the working link in the first ring and the corresponding protection link;
  • a judging module 2042 is at the first cross node
  • link fault detection is implemented by transmitting a fault detection message in a single ring, and the fault of the link can be detected accurately and quickly.
  • the first ring in this embodiment may be ring 1 in FIG. 5
  • the second ring may be ring 2 in FIG.
  • the inflow node is node 1 in ring 1, and the outbound node is a node in ring 2.
  • the working link in ring 1 is (1-2-3), the protection link is (1-6-7-8-3), the first cross node is node 1, and the second cross node is node 3.
  • the first ring, the second ring, the inflow node, the outflow node, the working link, and the protection link in the present invention are not limited to the above, for example, the first cross node may be the node 3 as shown in FIG.
  • the two cross nodes may be the node 5 shown in FIG.
  • the transmission unit 206 includes: a second sending module 2061 and a first transmitting module 2062.
  • the second sending module 2061 and the first transmitting module 2062 may use the cross-ring protection link to transmit the cross-ring service from the ingress node to the outbound node by using the following steps: the second sending module 2061 determines the working link in the first ring and After the corresponding protection link is faulty, when the first cross node is one of the inflow node and the egress node, the second cross node sends the fault indication message to the inflow through the second ring adjacent to the first ring.
  • the transmission unit 206 further includes: a third sending module 2063 and a second transmitting module 2064 connected in sequence.
  • the third sending module 2063 and the second transmitting module 2064 may use the cross-ring protection link to transmit the cross-ring service from the ingress node to the outbound node by using the following steps: the third sending module 2063 determines the working link in the first ring and After the corresponding protection link fails, when the first cross node and the second cross node are not inflow nodes and/or outflow nodes, the second cross node is faulty through the second ring adjacent to the first ring.
  • the indication message is sent to one of the inflow node and the outflow node, and the first cross node sends the fault indication message to the other of the inflow node and the outflow node through the third ring adjacent to the first ring, where The fault indication message is used to indicate that the working link and the corresponding protection link in the first ring are faulty.
  • the second transmission module 2064 flows out from the inflow node through the cross-ring protection link.
  • the node transmits the cross-ring service.
  • the fault indication message can quickly and accurately notify the ingress node and the outbound node to initiate a cross-ring protection link to ensure correct transmission of the cross-ring service.
  • the transmission unit 206 further includes: a default module 2065.
  • the default module 2065 is one of the inflow node and the outflow node, and determines the inflow node and the outflow node.
  • the other of the ingress node and the outbound node is caused to transmit the cross-ring service through one of the ingress node and the outbound node through the cross-ring protection link.
  • the link fault information of the ring it can be determined whether the cross-ring protection link is enabled to transmit the cross-ring service without indicating by the indication information, thereby further simplifying the detection step and reducing the system. Overhead, avoiding unnecessary system delays.
  • the transmitting unit 206 is further configured to: after detecting that the working link and the corresponding protection link in the first ring are faulty, detecting a cross-loop working path between the inflow node and the outflow node. In the event of a failure and a failure after a predetermined period of delay, the ingress node is caused to transmit cross-ring traffic to the outbound node through the cross-ring protection path.
  • the detecting unit 204 detects whether the working link and the corresponding protection link of each of the at least two rings are faulty. In the preferred embodiment, by detecting whether a link in each ring is faulty, the occurrence of a link failure can be accurately and quickly located, and the detection efficiency is improved.
  • FIG. 3 is a flowchart of a method for transmitting a cross-ring service according to an embodiment of the present invention, including:
  • S304 Detect whether a working link and a corresponding protection link in one of the at least two rings are faulty, where, in an initial state, the inflow node passes the working link in each of the at least two rings. Transmitting a cross-ring service to an outbound node;
  • the inflow node transmits the cross-ring service to the egress node by using the cross-ring protection link.
  • the cross-ring protection link is configured for the service that is transmitted across the ring, so that when the working link and the corresponding protection link in the single ring are detected to be faulty, the above-mentioned cross-ring protection chain may be used. The road to continue the transmission of the service solves the problem that the single-ring protection recovery method cannot be used to recover the cross-ring service in the prior art.
  • the correct transmission of the cross-ring service can also be ensured.
  • the working link and the corresponding protection link in one of the at least two rings fail, the working link and the corresponding protection link in one of the at least two rings
  • the fault occurs, and the cross-ring link is switched, that is, the cross-ring service is transmitted from the ingress node to the outbound node through the cross-ring protection link.
  • the inflow node is connected to the starting node of the cross-ring service or connected to the starting node; the outbound node is connected to the destination node of the cross-ring service or connected to the destination node.
  • the location of the ingress node and the outflow node are further illustrated so that the present invention can be applied to different network topologies.
  • the following detection steps are used to detect whether the working link and the corresponding protection link in one of the at least two rings are faulty: the first cross node and the first one in the first ring of the at least two rings
  • the second cross node sends a fault detection packet to the peer through the working link in the first ring and the corresponding protection link, where the first cross node and the second cross node are working links and corresponding protections in the first ring.
  • link fault detection is implemented by transmitting a fault detection message in a single ring, and the fault of the link can be detected accurately and quickly.
  • the first cross node is one of the inflow node and the outflow node, and the other of the inflow node and the outflow node is determined If the ring fails, the other of the ingress node and the outbound node transmits the cross-ring service through one of the ingress node and the outbound node through the cross-ring protection link.
  • the link fault information of the ring it can be determined whether the cross-ring protection link is enabled to transmit the cross-ring service without indicating by the indication information, thereby further simplifying the detection step and reducing the system overhead, thereby avoiding unnecessary System delay.
  • the second cross node After determining that both the working link and the corresponding protection link in the first ring are faulty, if the first cross node is one of the inflow node and the outflow node, the second cross node passes the The second ring adjacent to the ring sends the fault indication message to the other one of the ingress node and the outbound node, where the fault indication message is used to indicate that the working link and the corresponding protection link in the first ring are both present. Fault; After receiving the fault indication message, the ingress node transmits the cross-ring service to the outbound node through the cross-ring protection link.
  • the fault indication message can quickly and accurately notify the ingress node and the outbound node to initiate a cross-ring protection link to ensure correct transmission of the cross-ring service. Or, after determining that both the working link and the corresponding protection link in the first ring are faulty, if the first cross node and the second cross node are not both the inflow node and the outflow node, the second cross node passes First ring The adjacent second ring sends the fault indication message to one of the inflow node and the outflow node, and the first cross node sends the fault indication message to the inflow node and the outflow node through the third ring adjacent to the first ring.
  • the fault indication message is used to indicate that the working link and the corresponding protection link in the first ring are faulty; after receiving the fault indication message, the inflow node flows out through the cross-ring protection link.
  • the node transmits the cross-ring service.
  • the fault indication message can quickly and accurately notify the ingress node and the outbound node to initiate a cross-ring protection link to ensure correct transmission of the cross-ring service.
  • the ingress node transmits the cross-ring service to the outbound node through the cross-ring protection path.
  • each of the at least two rings described above simultaneously performs the above detecting step.
  • FIG. 4 is another structural block diagram of a transmission system of a cross-ring service according to an embodiment of the present invention, including: a fault detection module 402, a fault indication and notification module 404, and a protection switching module 406, which are sequentially connected, wherein:
  • the detection module 402 mainly passes the failure of a TCM (Tandem Connection Monitor) or a SPME (Sub-Path Maintenance Element) on a segment of the LSP (Label Switching Path) or a series of consecutive links. Detecting a packet to detect a fault on the part of the link.
  • TCM Tandem Connection Monitor
  • SPME Sub-Path Maintenance Element
  • the TCM fault detection packet is a CC (Continuity Check) or CV packet
  • the SPME fault detection packet is a CC or CV (Connectivity Verification) packet.
  • a CC or CV is sent between the two nodes on the link TCM or SPME to detect the fault.
  • the peer node does not receive the fault detection packet sent by the peer end within a certain period of time, the part link is considered to be TCM or SPME.
  • the fault indication and notification module 404 is primarily configured to advertise and indicate faults so that the switching node can properly switch and coordinate. It mainly includes the following functions: One is that when a part of the link detects a fault, but the corresponding part of the link protection path does not have a fault, the module needs to trigger the protection path through the state coordination mechanism.
  • the module inserts a fault indication message on the LSP on the client layer transmitted on the module (for example: LDI (Link Defect Indication) Etc.)), to trigger the linear end-to-end LSP or SPME in the protection domain, TCM protection, that is, triggering the cross-ring protection link;
  • LDI Link Defect Indication
  • TCM protection that is, triggering the cross-ring protection link;
  • the fault is detected on the cross-loop working path, and the fault still exists after a delay. Then cross-ring protection is triggered.
  • the protection switching module 406 is mainly triggered by the detection result and the advertised information of the previous two modules, and the corresponding protection is triggered by the switching node to implement protection and recovery of the affected service.
  • Link failure is detected by a fault detection module on the established partial link (TCM, SPME). Faults on the working and protection part of the link TCM or SPME are detected by periodically transmitting CC messages or CV messages on the working and protection part of the link.
  • LSP service layer fault indication message
  • Link Defect Indication For customer layer LSP, SPME or TCM alarm suppression or protection of linear end-to-end LSPs in the protection domain or SPME or TCM protection switching.
  • AIS Alarm Indication Signal, etc.
  • the two nodes on the SPME or TCM receive the service layer fault indication message (LDI, etc.) or the node itself detects that its working and protection part link TCM or SPME is faulty or detected.
  • LLI service layer fault indication message
  • the node After a fault exists on the cross-loop working path, when there is still a fault after a predetermined period of delay, triggering linear end-to-end LSP protection or SPME or TCM layer switching in the protection domain triggers the cross-ring protection link.
  • FIG. 5 Switch from the source to the protection path (1-6-7-8-9-0-5) in the cross-ring service.
  • Embodiment 4 This embodiment implements the transmission of the cross-ring service for the SPME mode. The specific process is as follows:
  • a SPME for the partial link in each single ring on the cross-ring LSP or SPME to perform the partial link monitoring and a corresponding SPME protection path, for example: For the single-ring Ring 1 part link Link (1-3) ), for which a SPME protection path (1-6-7-8-3) is configured; for a partial link Link (3-5) on the single ring Ring 2, a SPME protection is configured for it.
  • the SPME tag of the intra-ring link is ejected first, and then the following end-to-end LSP or SPME tag is popped up. Lower ring operation. S3.
  • a SPME in a ring detects that the part of the path has a fault, as shown in Figure 6, when the link is connected
  • a fault indication alarm (such as LDI or AIS) is inserted into the LSP of the client layer by the node on the link that detects the fault. If there is no fault in the corresponding SPME protection path, the node will be in the fault. The LSP service transmitted on part of the link is switched to its corresponding SPME protection path.
  • the transmission is performed, and the downstream converged node re-switches to the original working path for transmission; as shown in Figure 6, when the link Link (2-3) fails, the cross-ring LSP or SPME path (1- 2-3-4-5)
  • the upper service is on the upstream node 1 of the faulty link, pushing the SPME label, and transmitting it to the downstream node 3 through its protection SPME path (1-6-7-8-3), and On node 3, the outer SPME tag is popped up, and the inner LSP or SPME label is exchanged, and then the SPME (3-4-5) is operated through the ring Ring 2, and the LSP or SPME service is transmitted to the node 5; Said to switch back to the original working path for transmission.
  • the text (eg, LDI, AIS) is inserted into the LSP on the working SPME (1-2-3), so that the node 5 receives the fault indication message (eg, LDI, AIS), or node 5 or node 1 detects If the cross-loop working link is faulty and there is still a fault after a delay, choose to protect the LSP or SPME path (1-6-7-8-9-0-5) from its end-to-end configuration (that is, cross-ring) Protection link) Receive service; If for node 1, since it can directly detect that there is a fault in the working of Ring 1 and the protection of the SPME path, choose to protect the LSP or SPME path from the configured end-to-end protection (1.6-7-8- 9-0-5 ) (ie cross-ring protection link) to send traffic.
  • the fault indication message eg, LDI, AIS
  • node 5 or node 1 detects If the cross-loop working link is faulty and there is still a fault after a delay, choose to protect the L
  • nodes 1 and 5 at both ends of the end-to-end LSP or SPME can directly detect their operation and their corresponding Ring 1 protection SPME (1-6-7-8-3) and Ring 2 If there is a fault in the upper protection SPME (3-8-9-0-5), both nodes 1 and 5 are switched to the end-to-end protection LSP or SPME (1-6-7-8-9-0- 5) Send or receive business.
  • Embodiment 5 This embodiment implements the transmission of the cross-ring service for the TCM mode. The specific process is as follows:
  • TCM for the partial link in each single ring of the cross-ring LSP or the TCM to perform the part of the link monitoring and a corresponding TCM protection path, for example: For the single-ring Ring 1 part link Link (1-3) For that, configure a corresponding TCM protection path (1-6-7-8-3) for it; for a partial link Link (3-5) on the single ring Ring 2, configure one for it.
  • TCM protection path (3-8-9-0-5) for the multi-ring interconnection scenario shown in Figure 9 and Figure 10, for the single-ring Ring 1 part of the link Link (1-3), Configure a corresponding TCM protection path (1-7-8-9-3), single ring Ring 2 part link (3-5), configure the corresponding TCM protection path (3-9-AB-5), single ring Ring 3 part link (5-6), configured corresponding TCM protection path (5-BC-6).
  • the OAM mechanism When detecting that the link of the working part is faulty, the OAM mechanism is used to detect whether the corresponding TCM protection path also has a fault. If there is a fault, the node on the part of the link that detects the fault is inserted with a fault indication alarm (such as LDI, AIS, etc.) on the client layer LSP above it; if there is no fault in the corresponding TCM protection path, On the transmitting end node of the part, the original working LSP label is replaced with a TCM protection label for transmission, and the downstream converged node is switched back to the original working path for transmission; as shown in FIG.
  • a fault indication alarm such as LDI, AIS, etc.
  • the link (2-3) fails, the service on the cross-ring LSP or TCM path (1-2-3-4-5) is on the upstream node 1 of the faulty link, and the original working LSP label is replaced with the protection TCM.
  • the label is transmitted to the downstream node 3 through its protected TCM path (1-6-7-8-3), and after the protection label is popped up on the node 3, the original working LSP label is pushed and the transmission continues.
  • S5. For the two nodes 1 and 5 in the cross-ring LSP protection domain, for the ring Ring 1 internal working TCM (1-2-3) and its corresponding protection TCM (1-6-7-8-3) shown in Figure 5.
  • the nodes 1 and 3 can directly detect that the TCM OAM packet is faulty, and the node 3 generates a fault indication packet (such as LDI or AIS).
  • the LSP is transmitted to the working TCM (1-2-3), so that the node 5 receives the fault indication message (LDI or AIS) or the node 5 detects that there is a fault in the cross-loop working link, and the delay still exists for a period of time.
  • the end-to-end LSP or TCM service that is transmitted is replaced by its corresponding protection TCM label, and the TCM (1-6-7-8-3) and Ring2 protection TCM are respectively protected along Ring 1 (3-8). In -9-0-5), it is transmitted to the opposite node 5, and then the lower ring operation is performed.
  • nodes 1 and 5 at both ends of the end-to-end LSP or TCM can directly detect the working TCM and its corresponding Ring 1 protection TCM (1-6-7-8-3). If there is a fault in the protection TCM (3-8-9-0-5) on Ring 2, both nodes 1 and 5 are switched to the end-to-end protection LSP or TCM (1-6-7-8-9- 0-5) Send or receive services.
  • Nodes 3 and 5 on the TCM respectively generate fault indication messages (LDI), which are sent to nodes 1 and 6 or nodes 1 or 6 in the downstream direction in both directions of the cross-ring LSP or TCM to detect cross-ring operation.
  • LPI fault indication messages
  • the end-to-end protection LSP or TCM (1 -7-8-9- ABC-6) (that is, the cross-ring protection link) is triggered to transmit the protected service.
  • FIG. 12 is another flowchart of a method for transmitting a cross-ring service according to an embodiment of the present invention, including: S1201. Configure a cross-ring protection link for the cross-ring LSP.
  • a cross-ring protection link is configured between an ingress node and an egress node for a cross-ring transmission service, and a working link in a single ring is detected and If the corresponding protection link is faulty and the cross-ring protection link is normal, the ingress node transmits the cross-ring service to the egress node through the cross-ring protection link, which solves the protection recovery method in the prior art only through the single ring.
  • 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.

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Abstract

L'invention concerne un procédé et un système de transmission destiné à des services par anneaux croisés. Ledit procédé comprend : la configuration d'une liaison de protection par anneaux croisés entre un nœud d'entrée et un nœud de sortie pour les services de transmission par anneaux croisés, ledit nœud d'entrée étant connecté audit nœud de sortie par le biais d'au moins deux anneaux et ladite liaison de protection par anneaux croisés connectant le nœud d'entrée et le nœud de sortie par le biais des nœuds de ces deux anneaux; la réalisation d'une détection permettant de déterminer si une liaison de fonctionnement et sa liaison de protection correspondante dans l'un de ces deux anneaux connaissent toutes deux des défaillances; et la transmission des services par anneaux croisés en provenance du nœud d'entrée et à destination du nœud de sortie par l'intermédiaire de la liaison de protection par anneaux croisés si la liaison de fonctionnement et sa liaison de protection correspondante dans l'un des deux anneaux connaissent toutes deux des défaillances. Grâce à cette invention, il est désormais possible d'utiliser un procédé de reprise de la protection par un seul anneau pour la reprise de services par anneaux croisés, et la reprise des services par anneaux croisés est toujours possible lorsque la liaison de fonctionnement et la liaison de protection connaissent simultanément des défaillances au cours de la transmission desdits services par anneaux croisés.
PCT/CN2012/072262 2011-03-30 2012-03-13 Procédé et système de transmission destinés à des services par anneaux croisés WO2012130039A1 (fr)

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