CN102857316A - Method and system for realizing source looped network protection - Google Patents
Method and system for realizing source looped network protection Download PDFInfo
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- CN102857316A CN102857316A CN2011101796433A CN201110179643A CN102857316A CN 102857316 A CN102857316 A CN 102857316A CN 2011101796433 A CN2011101796433 A CN 2011101796433A CN 201110179643 A CN201110179643 A CN 201110179643A CN 102857316 A CN102857316 A CN 102857316A
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Abstract
The invention discloses a method and system for realizing source looped network protection. The method disclosed by the invention comprises the following steps: a service table of a tunnel protection group is set at a service access node, wherein the service table is used for recording nodes contained in an active link of the tunnel protection group along an output direction of a service flow and the state of each section of the active link; a link fault finding node or a node which receives a switching command in the tunnel protection group sends an automatic protection switching message, other non-automatic protection switching message target nodes in the tunnel protection group transfer the automatic protection switching message along a sending direction of the automatic protection switching message, after a service access node in the tunnel protection group receives the automatic protection switching message, the state of a corresponding section in the service table of the maintained tunnel protection group is updated, and the state of the tunnel protection group is determined and whether link switching is executed or not is determined. The method disclosed by the invention can reduce workload of loop graph configuration and can improve intelligent degree when topology along a network processing route is changed.
Description
Technical field
The present invention relates to the data communication field, relate more specifically to a kind of method and system that realize looped network protection.
Background technology
Multiprotocol label switching (Multi-protocol Label Switching; abbreviation MPLS) technology is one of important technology in the Packet Transport Network; survivability is to weigh one of Packet Transport Network network quality important indicator; in order to promote survivability, designed in the industry diverse network protection reset mode.Protected mode in the Packet Transport Network network commonly used has linear protection and looped network protection, and looped network protection has two kinds of protection mechanisms, is respectively Wrapping protected mode and Steering protected mode.The Wrapping protected mode is based on the loopback protection of fault phase neighbors and switches, and the Steering protected mode is based on business and protects end to end and switch.This case relates generally to the implementation method of Steering protected mode.
As shown in Figure 1a, in the situation of using the Steering protected mode, when looped network fault-free or request switching, the operating path of Business Stream is: 1＜-〉 2＜-〉 3＜-〉 4; Protection path is: 1＜-〉 6＜-〉 5＜-〉 4＜-〉 3＜-〉 2＜-〉 1.
Shown in Fig. 1 b, when between node 2 and the node 3 during link failure, node 2 and node 3 send APS (APS) message along upper two ports of ring (namely western to port and east orientation port) to the other side respectively.Node 1 and node 4 receive carry out after the APS message work flow to, Business Stream is transmitted according to 1＜-〉 6＜-〉 5＜-〉 4 path.
The realization mechanism of Steering protected mode and Wrapping mechanism are different; such as Fig. 1 b; after node 2 detects fault; carry APS message (APS message generally is encapsulated as the form of OAM message) to point of proximity node 3 and reverse node transmission, it is identical with it that node 3 detects the post-fault mode.After other node is received APS message; ring figure (Ring map) according to pre-save checks that the business on this node is subjected to the situation that affects of fault point; the Business Stream that is subject to fault effects is switched at its source node and terminal note execution bridge joint, be switched to the protection link from active link.This programme is based on the ring figure that APS message and equipment preserved and confirms affected business, APS message ITU-T G.8132 standard definition is arranged, do not give unnecessary details herein.
Safeguard commonly used the comprising of mode of ring figure in the such scheme:
Find whole ring-network topology figure and topological relation by a kind of dynamic protocol, and the renewal of finishing alternately ring figure by node.The defective of this mode is for needing to improve the utilance of the network bandwidth and node cpu.
By static configuration means each node configuration ring figure in ring-network topology figure.The defective of this mode is for to carry out the whole ring-network topology figure of static configuration to every equipment, and the configuration effort amount is large, is unfavorable for topology change.
So need new solution to realize Steering formula looped network protection.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of method and system that realize looped network protection, saves the network bandwidth and node power consumption, the degree of intelligence when improving the topology change of network processes path direction.
In order to solve the problems of the technologies described above, the invention provides a kind of method that realizes looped network protection, comprising: in the traffic table of service access Node configuration protecting tunnel group; The node that the active link that this traffic table is used for recording described protecting tunnel group comprises along the Business Stream outbound course and active link be the state of the section of striding respectively; Described protecting tunnel group link fault discovery node or receive that the node of switching order sends APS message; other non-automatic protection switching messages destination node is along described APS message sender to transmitting described APS message in the described protecting tunnel group; after the service access node is received described APS message in the described protecting tunnel group; the state of the corresponding section of striding is determined protecting tunnel group state and is determined whether to carry out link switchover in the traffic table of the described protecting tunnel group that renewal is safeguarded.
Further, said method can also have following characteristics:
During the active link fault Business Stream is comprised from the method that active link is switched to the protection link: after described protecting tunnel group link fault discovery node detects the active link fault; along link east to the west be the APS message of fault warning state to sending the indication fault point place section of striding; other non-automatic protection switching messages destination node is along described APS message sender to transmitting described APS message in the described protecting tunnel group; after the service access node is received described APS message in the described protecting tunnel group; the state of the corresponding section of striding in the traffic table of the described protecting tunnel group that renewal is safeguarded; determine that protecting tunnel group state is guard mode, and Business Stream is switched to the protection link from described active link.
Further, said method can also have following characteristics:
After the active link fault recovery method of Business Stream from the protection link switchover to active link comprised: after described protecting tunnel group link fault recovery finds that node detects the active link fault; along link east to the west be the APS message of Wait-to-Restore state to sending the indication fault recovery point place section of striding; other non-automatic protection switching messages destination node is along described APS message sender to transmitting described APS message in the described protecting tunnel group; after the service access node is received described APS message in the described protecting tunnel group; the state of the corresponding section of striding in the traffic table of the described protecting tunnel group that renewal is safeguarded; when the state of calculating protecting tunnel group is the Wait-to-Restore state; start the Wait-to-Restore timer; after this timer arrives; determine that protecting tunnel group state is operating state, and with Business Stream from the protection link switchover to active link.
Further, said method can also have following characteristics:
Switching command triggers by agreement comprises Business Stream from the method that active link is switched to the protection link: after the agreement the described protecting tunnel group on the active link is switched the order receiving node and received that agreement is switched order; along link east to the west to the APS message that sends indication and be in the section of striding of Forced Switch state; other non-automatic protection switching messages destination node is along described APS message sender to transmitting described APS message in the described protecting tunnel group; after the service access node is received described APS message in the described protecting tunnel group; the state of the corresponding section of striding in the traffic table of the described protecting tunnel group that renewal is safeguarded; determine that protecting tunnel group state is guard mode, and Business Stream is switched to the protection link from active link.
Further, said method can also have following characteristics:
Switching command triggers by agreement comprises from the protection link switchover Business Stream to the method for active link: after the agreement the described protecting tunnel group on the protection link is switched the order receiving node and received that agreement is switched order; along link east to the west to the APS message that sends indication and be in the section of striding of protection blocking state; other non-automatic protection switching messages destination node is along described APS message sender to transmitting described APS message in the described protecting tunnel group; after the service access node is received described APS message in the described protecting tunnel group; the state of the corresponding section of striding in the traffic table of the described protecting tunnel group that renewal is safeguarded; determine that protecting tunnel group state is operating state, and with Business Stream from the protection link switchover to active link.
In order to solve the problems of the technologies described above, the present invention also provides a kind of system that realizes looped network protection, and wherein, described system comprises a plurality of link nodes that consist of the protecting tunnel group; Described link nodes is when being used for as the service access node, in the traffic table of service access Node configuration protecting tunnel group; The node that the active link that this traffic table is used for recording described protecting tunnel group comprises along the Business Stream outbound course and active link be the state of the section of striding respectively; Send APS message when also being used for finding that as link failure node or agreement are switched the order receiving node; When also being used for as the non-automatic protection switching messages of described protecting tunnel group destination node along described APS message sender to transmitting described APS message; After receiving described APS message when also being used for as the service access node, the state of the corresponding section of striding is determined protecting tunnel group state and is determined whether to carry out link switchover in the traffic table of the described protecting tunnel group that renewal is safeguarded.
Further, said system can also have following characteristics:
Described link nodes, after also being used for detecting the active link fault as described protecting tunnel group link fault discovery node, along link east to the west be the APS message of fault warning state to sending the indication fault point place section of striding; Also for after receiving described APS message as the service access node; the state of the corresponding section of striding in the traffic table of the described protecting tunnel group that renewal is safeguarded; determine that protecting tunnel group state is guard mode, and Business Stream is switched to the protection link from described active link.
Further, said system can also have following characteristics:
Described link nodes, after also being used for finding that as described protecting tunnel group link fault recovery node detects the active link fault, along link east to the west be the APS message of Wait-to-Restore state to sending the indication fault recovery point place section of striding; Also for after receiving described APS message as described protecting tunnel group service access node; the state of the corresponding section of striding in the traffic table of the described protecting tunnel group that renewal is safeguarded; when the state of calculating protecting tunnel group is the Wait-to-Restore state; start the Wait-to-Restore timer; after this timer arrives; determine that protecting tunnel group state is operating state, and with Business Stream from the protection link switchover to active link.
Further, said system can also have following characteristics:
Described link nodes, after also being used for switching the order receiving node and receiving that agreement is switched order as the agreement on the described protecting tunnel group active link, along link east to the west to the APS message that sends indication and be in the section of striding of Forced Switch state; Also for after receiving described APS message as described protecting tunnel group service access node; the state of the corresponding section of striding in the traffic table of the described protecting tunnel group that renewal is safeguarded; determine that protecting tunnel group state is guard mode, and Business Stream is switched to the protection link from active link.
Further, said system can also have following characteristics:
Described link nodes, after also being used for switching the order receiving node and receiving that agreement is switched order as the agreement on the described protecting tunnel group protection link, along link east to the west to the APS message that sends indication and be in the section of striding of protection blocking state; Also for after receiving described APS message as described protecting tunnel group service access node; the state of the corresponding section of striding in the traffic table of the described protecting tunnel group that renewal is safeguarded; determine that protecting tunnel group state is operating state, and with Business Stream from the protection link switchover to active link.
Ring net protection method is applicable to Steering formula looped network in the such scheme; utilized ITU-T looped network APS message technology G.8132; at aspect of performance; can guarantee in 50ms fully; can mate well with the wrapping protection scheme simultaneously, the APS protocol command is switched fully and can be merged in such scheme.When the operating path direction among the ring-network topology figure changes, only need to upgrade the traffic table configuration of Service Access point; If in the topology change of Protection path direction, do not need the renewal to traffic table, thereby greatly reduced the configuration effort amount, the degree of intelligence when improving the topology change of network processes path direction.Traffic table disposes with static mode, need not to use protocol negotiation to upgrade, and can save the network bandwidth and node power consumption.
Description of drawings
Fig. 1 a is Steering looped network protection schematic diagram in the prior art;
Fig. 1 b is the Steering looped network protection active link schematic diagram that breaks down in the prior art;
Fig. 2 is the schematic flow sheet of realizing the method for looped network protection;
Fig. 3 a is Steering looped network protection schematic diagram during the looped network protection normal condition among the embodiment;
Fig. 3 b is Steering looped network protection schematic diagram during looped network protection active link fault among the embodiment;
Fig. 3 c is Steering looped network protection schematic diagram during the fault recovery of looped network protection active link among the embodiment;
Fig. 3 d is Steering looped network protection schematic diagram when looped network protection APS protocol command is switched among the embodiment;
Fig. 4 is the handling process schematic diagram of looped network looped network node when breaking down;
The handling process schematic diagram of looped network node when Fig. 5 is the ring network fault recovery;
Fig. 6 is the carry on an agreement handling process schematic diagram of looped network node when switching order of looped network.
Embodiment
Method and system in this programme is applicable to Steering formula looped network.
As shown in Figure 2, the method for realization looped network protection comprises: in the traffic table of service access Node configuration protecting tunnel group; The node that the active link that this traffic table is used for recording described protecting tunnel group comprises along the Business Stream outbound course and active link be the state of the section of striding respectively; Described protecting tunnel group link fault discovery node or receive that the node of switching order sends APS message; other non-automatic protection switching messages destination node is along described APS message sender to transmitting described APS message in the described protecting tunnel group; after the service access node is received described APS message in the described protecting tunnel group; the state of the corresponding section of striding is determined protecting tunnel group state and is determined whether to carry out link switchover in the traffic table of the described protecting tunnel group that renewal is safeguarded.
Said method is applicable to multiple application situation, and the below describes with a plurality of embodiment.
Implement one
After link failure finds that node detects link failure; Yan Dong, west periodically send APS message to port to adjacent node; carry out the traffic table coupling; do not represent that namely this node is non-service access node if match traffic table; then do not carry out other operation; if match traffic table and match the source node of APS message and the sign of destination node, represent that then this node is the service access node, then traffic table is upgraded and the protection group switching of making a strategic decision.
Non-link failure finds that node is after the APS message that receives other node transmission; judge whether this node is the destination node of APS message; if so, then do not carry out the forwarding of this message, otherwise transmit this message along the direction of transfer of this message.Further; carry out the traffic table coupling; do not represent that namely this node is non-service access node if match traffic table; then do not carry out other operation; if match traffic table and match the source node of APS message and the sign of destination node; represent that then this node is the service access node, traffic table is upgraded and the protection group switching of making a strategic decision.
So, during the active link fault Business Stream is comprised from the method that active link is switched to the protection link:
After described protecting tunnel group link fault discovery node detects the active link fault; along link east to the west be the APS message of fault warning state to sending the indication fault point place section of striding; other non-automatic protection switching messages destination node is along described APS message sender to transmitting described APS message in the described protecting tunnel group; after the service access node is received described APS message in the described protecting tunnel group; the state of the corresponding section of striding in the traffic table of the described protecting tunnel group that renewal is safeguarded; determine that protecting tunnel group state is guard mode, and Business Stream is switched to the protection link from described active link.
Embodiment two:
After link failure recovery finds that node detects link failure recovery; Yan Dong, west periodically send APS message to port to adjacent node; carry out the traffic table coupling; do not represent that namely this node is non-service access node if match traffic table; then do not carry out other operation; if match traffic table and match the source node of APS message and the sign of destination node; represent that then this node is the service access node; then traffic table is upgraded and started Wait-to-Restore (Wait to Restore, be called for short WTR) timer.
Non-link failure recovery finds that node is after the APS message that receives other node transmission; judge whether this node is the destination node of APS message; if so, then do not carry out the forwarding of this message, otherwise transmit this message along the direction of transfer of this message.Further; carry out the traffic table coupling; do not represent that namely this node is non-service access node if match traffic table; then do not carry out other operation; if match traffic table and match the source node of APS message and the sign of destination node; represent that then this node is the service access node, traffic table is upgraded and started the WTR timer.
When the WTR timer then after, the service access node with Business Stream from the protection link switchover to active link.
So, after the active link fault recovery method of Business Stream from the protection link switchover to active link comprised:
After described protecting tunnel group link fault recovery finds that node detects the active link fault; along link east to the west be the APS message of Wait-to-Restore state to sending the indication fault recovery point place section of striding; other non-automatic protection switching messages destination node is along described APS message sender to transmitting described APS message in the described protecting tunnel group; after the service access node is received described APS message in the described protecting tunnel group; the state of the corresponding section of striding in the traffic table of the described protecting tunnel group that renewal is safeguarded; when the state of calculating protecting tunnel group is the Wait-to-Restore state; start the Wait-to-Restore timer; after this timer arrives; determine that protecting tunnel group state is operating state, and with Business Stream from the protection link switchover to active link.
Embodiment three
Switch command triggers when carrying out link switchover by agreement; after agreement is switched the order receiving node and is received that agreement is switched order; Yan Dong, west periodically send APS message to port to adjacent node; carry out the traffic table coupling; do not represent that namely this node is non-service access node if match traffic table; then do not carry out other operation; if match traffic table and match the source node of APS message and the sign of destination node; represent that then this node is the service access node, then traffic table is upgraded and the protection group switching of making a strategic decision.
Non-agreement is switched the order receiving node after the APS message that receives other node transmission; judge whether this node is the destination node of APS message; if so, then do not carry out the forwarding of this message, otherwise transmit this message along the direction of transfer of this message.Further; carry out the traffic table coupling; do not represent that namely this node is non-service access node if match traffic table; then do not carry out other operation; if match traffic table and match the source node of APS message and the sign of destination node; represent that then this node is the service access node, traffic table is upgraded and the protection group switching of making a strategic decision.
In the implementation one; switching command triggers by agreement comprises Business Stream from the method that active link is switched to the protection link: after the agreement the described protecting tunnel group on the active link is switched the order receiving node and received that agreement is switched order; along link east to the west to the APS message that sends indication and be in the section of striding of Forced Switch state; other non-automatic protection switching messages destination node is along described APS message sender to transmitting described APS message in the described protecting tunnel group; after the service access node is received described APS message in the described protecting tunnel group; the state of the corresponding section of striding in the traffic table of the described protecting tunnel group that renewal is safeguarded; determine that protecting tunnel group state is guard mode, and Business Stream is switched to the protection link from active link.
In the implementation two; switching command triggers by agreement comprises from the protection link switchover Business Stream to the method for active link: after the agreement the described protecting tunnel group on the protection link is switched the order receiving node and received that agreement is switched order; along link east to the west to the APS message that sends indication and be in the section of striding of protection blocking state; other non-automatic protection switching messages destination node is along described APS message sender to transmitting described APS message in the described protecting tunnel group; after the service access node is received described APS message in the described protecting tunnel group; the state of the corresponding section of striding in the traffic table of the described protecting tunnel group that renewal is safeguarded; determine that protecting tunnel group state is operating state, and with Business Stream from the protection link switchover to active link.
The system that realizes looped network protection comprises a plurality of link nodes that consist of the protecting tunnel group; Link nodes finds that as link failure node, non-link failure discovery node, link failure recovery discovery node, non-link failure recovery discovery node, agreement are switched the order receiving node, accordingly operation in execution said method when non-agreement is switched order receiving node, service access node in the protecting tunnel group, repeat no more herein.
The below is illustrated with specific embodiment.
Such as Fig. 3 a, configuration Steering looped network protection group in the Steering looped network protection, and depend on work tunnel the equipment configuration service table in order of process, node ID of every devices allocation is come unique identification in the whole ring topological diagram, and enables the APS agreement.
Set up Steering looped network protection environment, each node on the ring is by distributing a node ID to come unique identification.In node 1,4 configuration two-way services; the operating path 1 of Business Stream＜-〉 2＜-〉 3＜-〉 4; the looped network protection path is: 1＜-〉 6＜-〉 5＜-〉 4＜-〉 3＜-〉 2＜-〉 1, and configuration looped network steering type protection group, Protection direction Business Stream.At Service Access point 1,4 configuration service tables, the place one's entire reliance upon node of operating path process of the configuration of traffic table, as: the traffic table of node 1 is 1,2,3,4, and the traffic table of node 4 is 4,3,2,1.Each node in the network environment is enabled the APS agreement, supposes counterclockwise to be the WEST direction, and clockwise direction is the EAST direction.
G.8132 standard is defined at ITU-T for the form of APS message in the implementation, comprises destination node ID, source node ID, solicited status.
Specific embodiment one
Shown in Fig. 3 b, produce fault between active link node 2 and the node 3.
APS message comprises along the node processing method on the WEST direction:
Link failure is found periodically to send APS message along the upper WEST direction port of ring to adjacent node after node 2 detects link failure, APS message indicating destination node is node 3, source node is node 2, the state of the section of striding is failure state (SF) between node 2 and the node 3, carry out the coupling of source node and destination node according to traffic table, mate unsuccessful other processing of not carrying out.
After non-link failure finds that node 1 is received the APS message of node 2 transmissions; judge whether this node is the destination node of APS message; judged result is not for being; continuation is transmitted this message along the WEST direction; carry out the coupling of source node and destination node according to traffic table, all in traffic table, node 1 upgrades the respectively state of the section of striding of traffic table for source node and destination node; and according to the priority of status of each section of striding relatively, obtain protecting tunnel group state.
After non-link failure finds that node 6 is received the APS message of node 1 transmission; judge whether this node is the destination node of APS message; judged result is not for being; continuation is transmitted this message along the WEST direction; carry out the coupling of source node and destination node according to traffic table, mate unsuccessful other operation of not carrying out.
After non-link failure finds that node 5 is received the APS message of node 6 transmissions; judge whether this node is the destination node of APS message; judged result is not for being; continuation is transmitted this message along the WEST direction; carry out the coupling of source node and destination node according to traffic table, mate unsuccessful other operation of not carrying out.
After non-link failure finds that node 4 is received the APS message of node 5 transmissions; judge whether this node is the destination node of APS message; judged result is not for being; continuation is transmitted this message along the WEST direction; carry out the coupling of source node and destination node according to traffic table, all in traffic table, node 4 upgrades the respectively state of the section of striding of traffic table for source node and destination node; and according to the priority of status of each section of striding relatively, obtain protecting tunnel group state.
Link failure judges whether this node is the destination node of APS message, and judged result is yes, does not carry out the forwarding of this message after finding that node 3 is received the APS message of node 4 transmissions.Carry out the coupling of source node and destination node according to traffic table, mate unsuccessful other operation of not carrying out.
APS message comprises along the node processing method on the EAST direction:
Link failure is found periodically to send APS message along the upper EAST direction port of ring to adjacent node after node 3 detects link failure, APS message indicating destination node is node 2, source node is node 3, the state of the section of striding is failure state (SF) between node 2 and the node 3, carry out the coupling of source node and destination node according to traffic table, mate unsuccessful other processing of not carrying out.
After non-link failure finds that node 4 is received the APS message of node 3 transmissions; judge whether this node is the destination node of APS message; judged result is not for being; continuation is transmitted this message along the EAST direction; carry out the coupling of source node and destination node according to traffic table, all in traffic table, node 4 upgrades the respectively state of the section of striding of traffic table for source node and destination node; and according to the priority of status of each section of striding relatively, obtain protecting tunnel group state.
After non-link failure finds that node 5 is received the APS message of node 4 transmissions; judge whether this node is the destination node of APS message; judged result is not for being; continuation is transmitted this message along the EAST direction; carry out the coupling of source node and destination node according to traffic table, mate unsuccessful other operation of not carrying out.
After non-link failure finds that node 6 is received the APS message of node 5 transmissions; judge whether this node is the destination node of APS message; judged result is not for being; continuation is transmitted this message along the EAST direction; carry out the coupling of source node and destination node according to traffic table, mate unsuccessful other operation of not carrying out.
After non-link failure finds that node 1 is received the APS message of node 6 transmissions; judge whether this node is the destination node of APS message; judged result is not for being; continuation is transmitted this message along the EAST direction; carry out the coupling of source node and destination node according to traffic table, all in traffic table, node 1 upgrades the respectively state of the section of striding of traffic table for source node and destination node; and according to the priority of status of each section of striding relatively, obtain protecting tunnel group state.
Link failure judges whether this node is the destination node of APS message, and judged result is yes, does not carry out the forwarding of this message after finding that node 2 is received the APS message of node 1 transmission.Carry out the coupling of source node and destination node according to traffic table, mate unsuccessful other operation of not carrying out.
Specific embodiment two
Shown in Fig. 3 c, fault recovery between active link node 2 and the node 3.
APS message comprises along the node processing method on the WEST direction:
After link failure recovery finds that node 2 detects link failure recovery, carry out the WTR state, periodically send APS message along the upper WEST direction port of ring to adjacent node, APS message indicating destination node is node 3, source node is node 2, the state of the section of striding is Wait-to-Restore (WTR) state between node 2 and the node 3, carries out the coupling of source node and destination node according to traffic table, mates unsuccessful other processing of not carrying out.
After non-link failure recovery finds that node 1 is received the APS message of node 2 transmissions; judge whether this node is the destination node of APS message; judged result is not for being; continuation is transmitted this message along the WEST direction, carries out the coupling of source node and destination node according to traffic table, and source node and destination node are all in traffic table; node 1 upgrades the respectively state of the section of striding of traffic table; and according to the priority of status of each section of striding relatively, obtain protecting tunnel group state, and start the WTR timer.
After non-link failure recovery finds that node 6 is received the APS message of node 1 transmission; judge whether this node is the destination node of APS message; judged result is not for being; continuation is transmitted this message along the WEST direction; carry out the coupling of source node and destination node according to traffic table, mate unsuccessful other operation of not carrying out.
After non-link failure recovery finds that node 5 is received the APS message of node 6 transmissions; judge whether this node is the destination node of APS message; judged result is not for being; continuation is transmitted this message along the WEST direction; carry out the coupling of source node and destination node according to traffic table, mate unsuccessful other operation of not carrying out.
After non-link failure recovery finds that node 4 is received the APS message of node 5 transmissions; judge whether this node is the destination node of APS message; judged result is not for being; continuation is transmitted this message along the WEST direction, carries out the coupling of source node and destination node according to traffic table, and source node and destination node are all in traffic table; node 4 upgrades the respectively state of the section of striding of traffic table; and according to the priority of status of each section of striding relatively, obtain protecting tunnel group state, and start the WTR timer.
Link failure recovery judges whether this node is the destination node of APS message, and judged result is yes, does not carry out the forwarding of this message after finding that node 3 is received the APS message of node 4 transmissions.Carry out the coupling of source node and destination node according to traffic table, mate unsuccessful other operation of not carrying out.
After link failure recovery finds that node 3 detects link failure recovery, enter the WTR state, periodically send APS message along the upper WEST direction port of ring to adjacent node, APS message indicating destination node is node 2, source node is node 3, the state of the section of striding is Wait-to-Restore (WTR) state between node 2 and the node 3, carries out the coupling of source node and destination node according to traffic table, mates unsuccessful other processing of not carrying out.
Link failure recovery judges whether this node is the destination node of APS message, and judged result is yes, does not carry out the forwarding of this message after finding that node 2 is received the APS message of node 3 transmissions.Carry out the coupling of source node and destination node according to traffic table, mate unsuccessful other operation of not carrying out.
The WTR timer then after, node 1 and node 4 are switched to protection link with Business Stream from active link according to protecting tunnel group Determines.
APS message comprises along the node processing method on the EAST direction:
Link failure recovery is found periodically to send APS message along the upper EAST direction port of ring to adjacent node after node 2 detects link failure recovery, APS message indicating destination node is node 3, source node is node 2, the state of the section of striding is Wait-to-Restore (WTR) state between node 2 and the node 3, carry out the coupling of source node and destination node according to traffic table, mate unsuccessful other processing of not carrying out.
Link failure recovery judges whether this node is the destination node of APS message, and judged result is yes, does not carry out the forwarding of this message after finding that node 3 is received the APS message of node 2 transmissions.Carry out the coupling of source node and destination node according to traffic table, mate unsuccessful other operation of not carrying out.
After link failure recovery finds that node 3 detects link failure recovery, enter the WTR state, periodically send APS message along the upper EAST direction port of ring to adjacent node, APS message indicating destination node is node 2, source node is node 3, the state of the section of striding is Wait-to-Restore (WTR) state between node 2 and the node 3, carries out the coupling of source node and destination node according to traffic table, mates unsuccessful other processing of not carrying out.
After non-link failure recovery finds that node 4 is received the APS message of node 3 transmissions; judge whether this node is the destination node of APS message; judged result is not for being; continuation is transmitted this message along the EAST direction, carries out the coupling of source node and destination node according to traffic table, and source node and destination node are all in traffic table; node 4 upgrades the respectively state of the section of striding of traffic table; and according to the priority of status of each section of striding relatively, obtain protecting tunnel group state, and start the WTR timer.
After non-link failure recovery finds that node 5 is received the APS message of node 4 transmissions; judge whether this node is the destination node of APS message; judged result is not for being; continuation is transmitted this message along the EAST direction; carry out the coupling of source node and destination node according to traffic table, mate unsuccessful other operation of not carrying out.
After non-link failure recovery finds that node 6 is received the APS message of node 5 transmissions; judge whether this node is the destination node of APS message; judged result is not for being; continuation is transmitted this message along the EAST direction; carry out the coupling of source node and destination node according to traffic table, mate unsuccessful other operation of not carrying out.
After non-link failure recovery finds that node 1 is received the APS message of node 6 transmissions; judge whether this node is the destination node of APS message; judged result is not for being; continuation is transmitted this message along the EAST direction, carries out the coupling of source node and destination node according to traffic table, and source node and destination node are all in traffic table; node 1 upgrades the respectively state of the section of striding of traffic table; and according to the priority of status of each section of striding relatively, obtain protecting tunnel group state, and start the WTR timer.
Link failure recovery judges whether this node is the destination node of APS message, and judged result is yes, does not carry out the forwarding of this message after finding that node 2 is received the APS message of node 1 transmission.Carry out the coupling of source node and destination node according to traffic table, mate unsuccessful other operation of not carrying out.
The WTR timer then after, node 1 and node 4 are switched to protection link with Business Stream from active link according to protecting tunnel group Determines.
Shown in Fig. 3 d, active link node 2 is received the order of agreement Forced Switch.
APS message comprises along the node processing method on the WEST direction:
After agreement is switched order receiving node 2 and is received agreement and switch order, periodically send APS message along the upper WEST direction port of ring to adjacent node, APS message indicating destination node is node 3, source node is node 2, the state of the section of striding is Forced Switch (FS) between node 2 and the node 3, carry out the coupling of source node and destination node according to traffic table, mate unsuccessful other processing of not carrying out.
After non-agreement is switched the APS message of order receiving node 1 receipts node 2 transmissions; judge whether this node is the destination node of APS message; judged result is not for being; continuation is transmitted this message along the WEST direction; carry out the coupling of source node and destination node according to traffic table, all in traffic table, node 1 upgrades the respectively state of the section of striding of traffic table for source node and destination node; and according to the priority of status of each section of striding relatively, obtain protecting tunnel group state.
After non-agreement is switched the APS message of order receiving node 6 receipts nodes 1 transmission; judge whether this node is the destination node of APS message; judged result is not for being; continuation is transmitted this message along the WEST direction; carry out the coupling of source node and destination node according to traffic table, mate unsuccessful other operation of not carrying out.
After non-agreement is switched the APS message of order receiving node 5 receipts nodes 6 transmissions; judge whether this node is the destination node of APS message; judged result is not for being; continuation is transmitted this message along the WEST direction; carry out the coupling of source node and destination node according to traffic table, mate unsuccessful other operation of not carrying out.
After non-agreement is switched the APS message of order receiving node 4 receipts nodes 5 transmissions; judge whether this node is the destination node of APS message; judged result is not for being; continuation is transmitted this message along the WEST direction; carry out the coupling of source node and destination node according to traffic table, all in traffic table, node 4 upgrades the respectively state of the section of striding of traffic table for source node and destination node; and according to the priority of status of each section of striding relatively, obtain protecting tunnel group state.
Non-agreement judges whether this node is the destination node of APS message, and judged result is yes, does not carry out the forwarding of this message after switching the APS message of order receiving node 3 receipts nodes 4 transmissions.Carry out the coupling of source node and destination node according to traffic table, mate unsuccessful other operation of not carrying out.
APS message comprises along the node processing method on the EAST direction:
After agreement is switched order receiving node 2 and is received agreement and switch order, periodically send APS message along the upper EAST direction port of ring to adjacent node, APS message indicating destination node is node 3, source node is node 2, the state of the section of striding is Forced Switch (FS) between node 2 and the node 3, carry out the coupling of source node and destination node according to traffic table, mate unsuccessful other processing of not carrying out.
Non-agreement judges whether this node is the destination node of APS message, and judged result is yes, does not carry out the forwarding of this message after switching the APS message of order receiving node 3 receipts nodes 2 transmissions.Carry out the coupling of source node and destination node according to traffic table, mate unsuccessful other operation of not carrying out.
The below describes each embodiment in the mode of method flow.
As shown in Figure 4, when looped network breaks down, the handling process of each node:
The active link fault has occured in step S401-1, looped network under normal condition;
Step S402-1, the node of looped network detects adjacent link and breaks down;
Step S403-1, the node that detects link failure periodically sends the signalling trouble message along east, west on the ring to port, and node enters step S404-1 simultaneously;
Step S403-2, node on the ring is received the signalling trouble message from eastern or west to port
Step S403-3, the destination node ID in the node extraction message and the node ID of this node compare;
Step S403-4, the destination node ID in the message and the node ID of this node do not wait, and message is from this message of another one port repeat, and enters step S404-1;
Step S403-5, the destination node ID in the message and the node ID of this node equate, the message termination, and enter step S404-1;
Step S404-1 carries out source node ID and destination node ID coupling according to the traffic table that equipment configures;
Step S405-1, node matching is successful, and making a strategic decision according to the priority state of APS, protection group is switched and the renewal of the traffic table section of striding state; Mate unsuccessfully, do not process.
As shown in Figure 5, when ring network fault is recovered, the handling process of each node:
Step S501-1, the fault recovery of looped network active link;
Step S502-1, the node of looped network detects the adjacent link fault recovery;
Step S503-1, the node that detects link failure recovery along the east on the ring, west periodically sends fault recovery notice message to port, the while node enters step S504-1;
Step S503-2, node on the ring is received fault recovery notice message from eastern or west to port
Step S503-3, the destination node ID in the node extraction message and the node ID of this node compare;
Step S503-4, the destination node ID in the message and the node ID of this node do not wait, and message is from this message of another one port repeat, and enters step S504-1;
Step S503-5, the destination node ID in the message and the node ID of this node equate, the message termination, and enter step S504-1;
Step S504-1 carries out source node ID and destination node ID coupling according to the traffic table that equipment configures;
Step S505-1, the node matching success is carried out the renewal of the decision business table section of striding shape and the startup of WTR timer according to the priority state of APS; Mate unsuccessfully, do not process;
Step S506-1, after the WTR timer arrives, notice protection group switchback, Business Stream is got back to active link.
As shown in Figure 6, looped network carries on an agreement when switching order, the handling process of each node:
Step S601-1, looped network is under normal condition;
Step S602-1 selects node on the ring fill order switching operation;
Step S603-1, the node that execution APS protocol command is switched periodically sends command request along east, west on the ring to port and switches message, and node enters step S604-1 simultaneously;
Step S603-2, node on the ring is switched message from eastern or west to the port request of receiving orders
Step S603-3, the destination node ID in the node extraction message and the node ID of this node compare;
Step S603-4, the destination node ID in the message and the node ID of this node do not wait, and message is from this message of another one port repeat, and enters step S604-1;
Step S603-5, the destination node ID in the message and the node ID of this node equate, the message termination, and enter step S604-1;
Step S604-1 carries out source node ID and destination node ID coupling according to the traffic table that equipment configures;
Step S605-1, node matching is successful, and making a strategic decision according to the priority state of APS, protection group is switched and the renewal of the traffic table section of striding state; Mate unsuccessfully, do not process.
Increase the configuration of traffic table in the such scheme at Service Access point, do not need the complete ring figure of each equipment, realize the Steering looped network protection.
From upper surface analysis as can be known; this programme does not utilize protocol negotiation ring figure and the whole network static configuration ring figure; fully compatible with traditional loopback (Wrapping) protection scheme; therefore this programme can be applied in the scene that existing Wrapping protection has again Steering to protect in the physical rings fully, and this programme can also be applied under the scenes such as realizing multi service access, multipoint fault and recovery in the physical rings certainly
Need to prove that in the situation of not conflicting, the embodiment among the application and the feature among the embodiment be combination in any mutually.
Certainly; the present invention also can have other various embodiments; in the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art can make according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
One of ordinary skill in the art will appreciate that all or part of step in the said method can come the instruction related hardware to finish by program, described program can be stored in the computer-readable recording medium, such as read-only memory, disk or CD etc.Alternatively, all or part of step of above-described embodiment also can realize with one or more integrated circuits.Correspondingly, each the module/unit in above-described embodiment can adopt the form of hardware to realize, also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
Claims (10)
1. method that realizes looped network protection, wherein,
Traffic table in service access Node configuration protecting tunnel group; The node that the active link that this traffic table is used for recording described protecting tunnel group comprises along the Business Stream outbound course and active link be the state of the section of striding respectively;
Described protecting tunnel group link fault discovery node or receive that the node of switching order sends APS message; other non-automatic protection switching messages destination node is along described APS message sender to transmitting described APS message in the described protecting tunnel group; after the service access node is received described APS message in the described protecting tunnel group; the state of the corresponding section of striding is determined protecting tunnel group state and is determined whether to carry out link switchover in the traffic table of the described protecting tunnel group that renewal is safeguarded.
2. the method for claim 1 is characterized in that,
During the active link fault Business Stream is comprised from the method that active link is switched to the protection link:
After described protecting tunnel group link fault discovery node detects the active link fault; along link east to the west be the APS message of fault warning state to sending the indication fault point place section of striding; other non-automatic protection switching messages destination node is along described APS message sender to transmitting described APS message in the described protecting tunnel group; after the service access node is received described APS message in the described protecting tunnel group; the state of the corresponding section of striding in the traffic table of the described protecting tunnel group that renewal is safeguarded; determine that protecting tunnel group state is guard mode, and Business Stream is switched to the protection link from described active link.
3. the method for claim 1 is characterized in that,
After the active link fault recovery method of Business Stream from the protection link switchover to active link comprised:
After described protecting tunnel group link fault recovery finds that node detects the active link fault; along link east to the west be the APS message of Wait-to-Restore state to sending the indication fault recovery point place section of striding; other non-automatic protection switching messages destination node is along described APS message sender to transmitting described APS message in the described protecting tunnel group; after the service access node is received described APS message in the described protecting tunnel group; the state of the corresponding section of striding in the traffic table of the described protecting tunnel group that renewal is safeguarded; when the state of calculating protecting tunnel group is the Wait-to-Restore state; start the Wait-to-Restore timer; after this timer arrives; determine that protecting tunnel group state is operating state, and with Business Stream from the protection link switchover to active link.
4. the method for claim 1 is characterized in that,
Switching command triggers by agreement comprises Business Stream from the method that active link is switched to the protection link:
After agreement in the described protecting tunnel group on the active link is switched the order receiving node and is received that agreement is switched order; along link east to the west to the APS message that sends indication and be in the section of striding of Forced Switch state; other non-automatic protection switching messages destination node is along described APS message sender to transmitting described APS message in the described protecting tunnel group; after the service access node is received described APS message in the described protecting tunnel group; the state of the corresponding section of striding in the traffic table of the described protecting tunnel group that renewal is safeguarded; determine that protecting tunnel group state is guard mode, and Business Stream is switched to the protection link from active link.
5. the method for claim 1 is characterized in that,
Switching command triggers by agreement comprises the method for Business Stream from the protection link switchover to active link:
After the agreement of protection on the link switched the order receiving node and received that agreement is switched order in the described protecting tunnel group; along link east to the west to the APS message that sends indication and be in the section of striding of protection blocking state; other non-automatic protection switching messages destination node is along described APS message sender to transmitting described APS message in the described protecting tunnel group; after the service access node is received described APS message in the described protecting tunnel group; the state of the corresponding section of striding in the traffic table of the described protecting tunnel group that renewal is safeguarded; determine that protecting tunnel group state is operating state, and with Business Stream from the protection link switchover to active link.
6. system that realizes looped network protection, wherein, described system comprises a plurality of link nodes that consist of the protecting tunnel group;
Described link nodes is when being used for as the service access node, in the traffic table of service access Node configuration protecting tunnel group; The node that the active link that this traffic table is used for recording described protecting tunnel group comprises along the Business Stream outbound course and active link be the state of the section of striding respectively; Send APS message when also being used for finding that as link failure node or agreement are switched the order receiving node; When also being used for as the non-automatic protection switching messages of described protecting tunnel group destination node along described APS message sender to transmitting described APS message; After receiving described APS message when also being used for as the service access node, the state of the corresponding section of striding is determined protecting tunnel group state and is determined whether to carry out link switchover in the traffic table of the described protecting tunnel group that renewal is safeguarded.
7. system as claimed in claim 6 is characterized in that,
Described link nodes, after also being used for detecting the active link fault as described protecting tunnel group link fault discovery node, along link east to the west be the APS message of fault warning state to sending the indication fault point place section of striding; Also for after receiving described APS message as the service access node; the state of the corresponding section of striding in the traffic table of the described protecting tunnel group that renewal is safeguarded; determine that protecting tunnel group state is guard mode, and Business Stream is switched to the protection link from described active link.
8. system as claimed in claim 6 is characterized in that,
Described link nodes, after also being used for finding that as described protecting tunnel group link fault recovery node detects the active link fault, along link east to the west be the APS message of Wait-to-Restore state to sending the indication fault recovery point place section of striding; Also for after receiving described APS message as described protecting tunnel group service access node; the state of the corresponding section of striding in the traffic table of the described protecting tunnel group that renewal is safeguarded; when the state of calculating protecting tunnel group is the Wait-to-Restore state; start the Wait-to-Restore timer; after this timer arrives; determine that protecting tunnel group state is operating state, and with Business Stream from the protection link switchover to active link.
9. system as claimed in claim 6 is characterized in that,
Described link nodes, after also being used for switching the order receiving node and receiving that agreement is switched order as the agreement on the described protecting tunnel group active link, along link east to the west to the APS message that sends indication and be in the section of striding of Forced Switch state; Also for after receiving described APS message as described protecting tunnel group service access node; the state of the corresponding section of striding in the traffic table of the described protecting tunnel group that renewal is safeguarded; determine that protecting tunnel group state is guard mode, and Business Stream is switched to the protection link from active link.
10. system as claimed in claim 6 is characterized in that,
Described link nodes, after also being used for switching the order receiving node and receiving that agreement is switched order as the agreement on the described protecting tunnel group protection link, along link east to the west to the APS message that sends indication and be in the section of striding of protection blocking state; Also for after receiving described APS message as described protecting tunnel group service access node; the state of the corresponding section of striding in the traffic table of the described protecting tunnel group that renewal is safeguarded; determine that protecting tunnel group state is operating state, and with Business Stream from the protection link switchover to active link.
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