CN1499747A - Method for implementing protection and restoration for intelligent optical network - Google Patents
Method for implementing protection and restoration for intelligent optical network Download PDFInfo
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- CN1499747A CN1499747A CNA02150136XA CN02150136A CN1499747A CN 1499747 A CN1499747 A CN 1499747A CN A02150136X A CNA02150136X A CN A02150136XA CN 02150136 A CN02150136 A CN 02150136A CN 1499747 A CN1499747 A CN 1499747A
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Abstract
In the invention, operational route and protective route are built automatically by using intelligent software at upper layer. When fault happens in operational route, service is switched to protective route based on ASP protocol; when fault is recovered, service is recovered to operational route based on ASP protocol. When the service is needed to delete, intelligent software at upper layer launches 'delete' command to delete protective route and operational route. The method represents flexibility of intelligent optical network as well as absorbs advantage of fast in protective mode of traditional optical network so as to meet international standard of realizing protection within 50 ms.
Description
Technical field
The present invention relates to the protection and the restoration methods of optical-fiber network, particularly the mode that adopts upper strata intelligence software and traditional protection mechanism to combine realizes ASON protection and the method for recovering.
Background technology
In traditional optical-fiber network, protection path and service path are by manual configuration.When protected light path detects fault, utilize APS agreement (APS) to realize professional switching fast from operating path to the protection path, the time of switching is usually less than 50MS.
ASON is to utilize route and signaling technology to set up the light path of bearer service automatically, and this and the professional light path of conventional optical network manual configuration have greatly improved.ASON increases a kind of intelligentized function at original Synchronous Digital Hierarchy (SDH) on synchronous optical network (SONET) and dense wave division multipurpose (DWDM) equipment, be used for realizing setting up automatically route and light path.This function also can realize operating path switching to the protection path.Yet, in existing optical-fiber network with above-mentioned intelligent function, owing to be to adopt software to realize the foundation and the deletion in operating path and protection path, after service path is set up,, will realize the management of switching by intelligence software in case break down.This function that is realized by software, the time of switching in operating path and protection path is limited by the performance of the CPU of software itself and equipment etc., so the time of switching services can not guarantee to finish in 50MS.That is to say; though utilizing the upper strata intelligence software to obtain, ASON sets up operating path and this progress of protection path automatically; yet; in case break down in the light path, its adopt speed of the switching services that software realizes from operating path to the protection path in fact be difficult to conventional optical network the switching services realized of the APS agreement that adopts to matching in excellence or beauty.
Content of the present invention
At above-mentioned the deficiencies in the prior art; the invention provides a kind of protection and restoration methods of ASON; it adopts intelligentized means to set up the operating path in this network automatically and protects the path; when monitoring fault in the operating path, can adopt the APS agreement in the conventional optical network to realize protection and path switching fast again.Method of the present invention had both embodied the flexible of ASON, had absorbed the fast length of conventional optical network protected mode again, can satisfy the international standard that realizes protection in the 50ms.
For realizing above-mentioned purpose of the present invention, a kind of ASON protection and method of recovering of realizing is provided, comprise and utilize the upper strata intelligence software to set up operating path and protection path automatically; When fault happens in operational, switch the business to the protection path according to the APS agreement; After fault recovery, business recovery is arrived operating path according to the APS agreement; When needs are deleted this business, initiate delete command by described upper strata intelligence software, deletion protection simultaneously and operating path.
In said method of the present invention, described upper strata intelligence software comprises Routing Protocol and signaling protocol.Described Routing Protocol is collected available light path information, forms the path status database and calculates best operating path and the protection path, and described signaling protocol is set up operating path and protection path according to the information of Routing Protocol between each node.Described signaling protocol also can send operating path and the protection path that delete command is set up with deletion.
Below in conjunction with accompanying drawing the method for the invention embodiment is elaborated, helps to understand technique scheme of the present invention.
Brief description of drawings
Fig. 1 schematically illustrates operating path and the protection path of setting up according to the present invention;
Fig. 2 shows according to bifurcated LSP model of the present invention;
Fig. 3 (A) is a bifurcated LSP schematic diagram yet to be built;
Fig. 3 (B) shows at origin node A and calculates ERO;
Fig. 3 (C) schematically illustrates along working LSP and sends the LSP request;
Fig. 3 (D) shows in first Node B and stops forwarding the LSP response;
Fig. 3 (E) illustrates that schematically first node sends the LSP request along protection LSP;
Fig. 3 (F) illustrates that schematically end-node is along protection LSP forwarding LSP response;
Fig. 3 (G) illustrates that schematically source node A sends CONFIRM message along working LSP and protection LSP;
Fig. 4 shows according to the present invention will delete bifurcated LSP;
The mode of deletion light path when Fig. 5 (A) illustrates working LSP and protects LSP all effective;
The mode of deletion light path when Fig. 5 (B) illustrates working LSP and protects LSP all to lose efficacy;
Fig. 5 (C) illustrates the mode of deleting light path when working LSP lost efficacy.
Concrete execution mode
The present invention utilizes intelligentized route and the signaling capability that utilizes the upper strata intelligence software to realize in the ASON; carry out pathfinding and set up the light operating path and the protection path; promptly collect available light path information by Routing Protocol; form path status database (LSDB); by constraint shortest path first (Constrained Shortest Path First; abbreviating CSPF as) algorithm calculates best operating path and protection path, sets up light path by signaling protocol CR-LDP (Constrained Route-Label Distribution Protocol is based on the tag distribution protocol of constraint route) or RSVP-TE (Resource Reservation Protocol-Traffic Engineering RSVP-traffic engineering expansion) between each node.When breaking down, the present invention utilizes traditional optical-fiber network to realize the fast detecting fault, switches fast by agreements such as APS realization business.After fault recovery, still realize the automatic recovery of service path by the APS agreement of conventional optical network.Below in conjunction with accompanying drawing, from the detection of foundation, deletion and the fault of service path, switch, aspect such as recovery illustrates said method of the present invention.
Fig. 1 schematically shows in ASON and sets up light path by signaling protocol.As shown in Figure 1, setting up light path in optical-fiber network can not be according to CR-LDP, and the RSVP-TE protocol mode is only set up a paths, but will adapt to the requirement of protection, sets up at least two light paths----operating path and protection path simultaneously.As shown in Figure 1, when setting up 1+1 protected service path, need set up operating path A and protection path B simultaneously from transmission network element TNE1 to TNE3 according to signaling protocol.
According to the present invention, when in ASON, setting up light path, consider the sequential of foundation and the sequential of deletion, the foundation and the deletion of bifurcated label forwarding path promptly of the present invention (LSP) according to signaling protocol.So-called bifurcated LSP refers to that a LSP has been divided into two LSP sections on some nodes, converges at other certain node again then.Fig. 2 is a bifurcated LSP model schematic diagram of the present invention.As shown in Figure 2, the LSP from A to H is branched into two LSP sections at the B node, converges at the G node then.LSP from A to H is called as bifurcated LSP, and wherein the B node is called the first node of bifurcated LSP, and the G node is called bifurcated LSP end-node; The A node is a source node, and the H node is a destination node.
The foundation of bifurcated LSP is described to Fig. 3 (G) below in conjunction with Fig. 3 (A).
Suppose and to set up the bifurcated LSP shown in following Fig. 3 (A) from source node A to destination node G.This bifurcated LSP merges at the F point at B point bifurcated, and wherein BCDEF is a working LSP, and BHIJF is protection LSP.It is as follows to set up such connection procedure:
(1) the A point initiates to connect the LSP request of setting up.Routing module calculates the path of A to H, and carrier band two cover ERO (Explicit Rout Object, route display object), and wherein, ERO1 is used for path A BCDEFG; ERO2 is used for path BHIJF.The longest ERO (as ERO1) of our regulations is work ERO, and other ERO is called protection ERO (as ERO2).Work ERO has only one, and protection ERO can have a plurality of, and such as through the different looped network of N the time, protection ERO just has N.This process is shown in Fig. 3 (B).
(2) each the node ABCDEFG along working LSP sends the LSP request message according to work ERO hop-by-hop, up to arriving destination node G, shown in Fig. 3 (C).Carry work ERO and protection ERO in the LSP request message, according to these information, it oneself is first node or the end-node of bifurcated LSP that each node can analyze.Shown in Fig. 3 (B): work ERO is ABCDEFG, and protection ERO is BHIJF, and according to a preconcerted arrangement, can analyze B is the first node of bifurcated LSP, and F is the end-node of bifurcated LSP.
In this process, if any one node refusal is set up LSP, then should not set up LSP again, all nodes discharge corresponding resource, and LSP sets up failure.
(3) destination node G receives after the LSP request message, upwards sends the LSP response message to upstream node along working LSP hop-by-hop successively.Each node is received after the LSP response message, checks whether this node is the first node of bifurcated LSP.If this node is a bifurcated LSP head node, no longer upstream nodes sends the LSP response message, shown in Fig. 3 (D).
(4) the B node is received after the LSP response message of C node, find that this node is the first node of bifurcated LSP, thus the B node no longer upstream nodes A send the LSP response message, but send the LSP request message to H node hop-by-hop successively according to intersecting ERO, up to the F node, shown in Fig. 3 (E).In the LSP request message of protection LSP section (BHIJF) transmission, comprise protection LSP sign (LSP ID).
(5) the F node knows that according to the protection LSP ID that is accepted this node is last node (protection ERO final jump) of protection LSP; (1+1 protection need be sent out in that the first node configuration of bifurcated LSP is two so configure hardware choosing is received; promptly send identical Business Stream with protection LSP in work; minor details at bifurcated LSP click receipts; promptly from work or protection LSP, select a Business Stream; concrete which business of selecting is by the control of APS agreement); send the LSP response message to the J node; and along the protection LSP successively hop-by-hop send to the B node, shown in Fig. 3 (F).After the B node receives that along protection LSP sends to this LSP response message, dispose that the hardware of this node is twoly sent out, choosing is received.Send the LSP response message then to upstream node A.
In the process of setting up protection LSP, if any one node refusal is set up LSP, then should delete protection LSP, and trigger the operation of deletion working LSP by the first node of bifurcated LSP (B node).
(6) source node A receives after the LSP response message, sends to confirm (Confirm) message to downstream node B, and this message is used for notifying this node of downstream node to receive the LSP response message.The B node sends Confirm message simultaneously to work and protection LSP section, and hop-by-hop issues successively, up to the F node.The F node can be received two parts of Confirm message, but the Confirm message that the F node only needs to receive at first sends to downstream node G.
It should be noted that each node is received all needs the alarm of opening the light after the Confirm message, is used for detecting light and loses etc., feasiblely can send warning information when detecting when light such as loses at mistake.
As shown in Figure 4, suppose that bifurcated LSP sets up, will delete LSP now and connect.After the connection delete command issued, if signaling channel is normal, connection will normally be deleted; If the signaling channel fault, then the connection of front, fault point is with deleted, and the connection of back, fault point will rely on the synchronizing process (synchronization mechanism after the fault recovery of GMPLS consensus standard definition) after the fault recovery to delete.
Fig. 4 shows the situation of initiating deletion at the A node.Alarm information is closed in the transmission of A point, and (message of GMPLS consensus standard regulation is used for closing the black out alarm.Can guarantee that like this upstream node deletes cross-coupled the time, can not cause that the light in downstream is lost alarm) arrive the B point; The B point is closed alarm information to working LSP section and the transmission of protection LSP section simultaneously, and after the G node was received the message of closing alarm, upstream nodes (F node) sent deletion message, to delete the LSP that sets up.
If working LSP section and protection LSP section signalling path are all normal, can be from the alarm information of closing that the A node sends along working LSP section and protection LSP section arrival F node.But the time that arrives can be inconsistent.According to the present invention, the F node must be waited for the arrival of closing alarm information on another LSP section after no matter still protecting the LSP section to receive to close alarm information from the working LSP section.Have only when the message of closing alarm after working LSP section and protection LSP section all arrive the F node, the F node just continues to send to downstream node closes alarm information.
The F node is being received closing after the alarm information of sending along working LSP section and protection LSP section, and hop-by-hop sends and closes alarm information successively downstream, arrives destination node G always.After the G node was received the message of closing alarm, upstream nodes (F node) sent deletion message, to delete the LSP that sets up.
If working LSP section and protection LSP section signalling path all lost efficacy, for example, shown in Fig. 5 (B), the D node failure in the working LSP section, the I node failure in protection LSP section.So, after C point or H point were received and closed alarm information, owing to the signaling channel with downstream node interrupts, C point or H point can not transmitted to downstream node and close alarm information (retransmission failure in other words).Like this, before C point and the H point be connected will owing to overtime can not receive response message and automatically deletion (existing upper strata intelligence software can be supported this point, upstream node before C point or the H point is after alarm information is closed in forwarding to downstream node, set a timer and wait for the arrival of deletion message, after timer expiry, also do not wait until deletion message, then deletion connects automatically).D point and I point (comprising this two node) being connected afterwards, will be after the node signalling path recovers, rely on other condition to delete, for example, carry out automatic synchronous detecting after the node signalling path recovers, adjacent node can carry out simultaneous operation, be that upstream node is issued downstream node with LSP ID, connect because upstream node has been deleted some automatically, it is inconsistent that downstream node can find that upstream node sends the LSP ID of LSP ID and this node, the connection of deleting unnecessary LSP ID representative.
Sometimes, have only working LSP section signalling path to lose efficacy or have only protection LSP section signalling path to lose efficacy.For example; in Fig. 5 (C); suppose the D node failure of working LSP; then after being dealt into the C node, no longer transmits alarm information to the working LSP downstream from closing of sending of A point; but protection closing alarm information and can arrive the F point smoothly on the LSP, F node receive on the protection LSP close alarm information after, will start the arrival that timer is waited for the pass alarm information on the working LSP; if timer expiry does not wait until that yet the F node will continue to transmit to close alarm information voluntarily to downstream node.The G node will upstream be sent out the deletion related news by normal delete procedure after receiving and closing alarm information, protect LSP normally to be deleted like this; Connection between the B-C point of working LSP will rely on timeout mechanism to delete, and the connection between the D-E-F point relies on and recovers the synchronization mechanism deletion.
Equally; when having only protection LSP signalling path to lose efficacy; similar with the processing of having only working LSP section signaling to lose efficacy; the result of deletion is: working LSP is normally deleted; connection before the fault point of protection LSP will rely on timeout mechanism to delete, and the connection after the fault point will rely on the synchronizing process after the fault recovery to delete.
According to the present invention, after utilizing the upper strata intelligence software to set up operating path automatically and protecting the path, when fault takes place, rapidly business is switched to the protection path by traditional APS agreement, this action can report network management system, and signaling is not exerted an influence.After operating path recovered, the protection agreement of still using traditional APS to operating path, did not exert an influence business recovery to the upper strata intelligence software.When the user deletes this when professional, then delete operating path and protection path simultaneously by signaling protocol.
The networking mode of multiple topology is supported in the protection that said method of the present invention can be realized; 1+1 protection as the chain topology; protection in 1: 1 of chain topology; the bidirectional protective of the two topological SNCP of monocycles fine or four fibres (subnet connects protection); the bidirectional protective of the monocycle topology MSP (multiplex section protection) of two fibres or four fibres; dicyclo topology MSP ring and the tangent protection of SNCP ring single-point; dicyclo topology SNCP ring and the tangent protection of SNCP ring single-point; dicyclo topology SNCP ring and 2 on MSP ring intersect protection (does not protect the single point failure of joining, the protection when protection (only supporting homonymy) when dicyclo topology MSP ring is connected with MSP ring DNI and dicyclo topology MSP ring are connected with MSP ring DNI.
The present invention combines the upper layer software (applications) of ASON and traditional APS protection cleverly, has both had the flexibility of ASON, and the reliability of conventional optical network is arranged again.
Claims (5)
1. realize ASON protection and the method for recovering, comprise
Utilize the upper strata intelligence software to set up operating path and protection path automatically;
When fault happens in operational, switch the business to the protection path according to APS (auto switching protection) agreement;
After fault recovery, business recovery is arrived operating path according to the APS agreement;
When needs are deleted this business, initiate delete command by described upper strata intelligence software, deletion protection simultaneously and operating path.
2. according to the process of claim 1 wherein that described upper strata intelligence software comprises Routing Protocol and signaling protocol.
3. method according to claim 2, described upper strata intelligence software are based on the CR-LDP that is used to set up LSP (Constrained Route-Label Distribution Protocol is based on the tag distribution protocol of constraint route) of standard or RSVP-TE (Resource Reservation Protocol-Traffic Engineering RSVP-traffic engineering expansion) agreement and Routing Protocol design.
4. according to the method for claim 3; wherein said Routing Protocol is collected available light path information; form the path status database and calculate best operating path and the protection path, described signaling protocol is simultaneously set up operating path and protection path by setting up bifurcated LSP according to the information of Routing Protocol between each node.
5. according to the method for claim 2, wherein delete the operating path and the protection path of foundation simultaneously according to the signaling protocol of described upper strata intelligence software, and the processing of abnormal conditions in delete procedure.
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| WO2006026930A1 (en) * | 2004-09-10 | 2006-03-16 | Huawei Technologies Co., Ltd. | A method for optical meshwork service restoration |
| WO2007009360A1 (en) * | 2005-07-15 | 2007-01-25 | Huawei Technologies Co., Ltd. | Method for restoring link failure and apparatus thereof |
| CN1306734C (en) * | 2003-03-04 | 2007-03-21 | 华为技术有限公司 | Service link protecting method for intelligent optical network |
| CN1309216C (en) * | 2004-10-08 | 2007-04-04 | 烽火通信科技股份有限公司 | Method for controlling plane participation protective rotation in ASON network |
| WO2007051388A1 (en) * | 2005-11-02 | 2007-05-10 | Huawei Technologies Co., Ltd. | A method for protecting the service flow and a network device |
| CN100369419C (en) * | 2005-07-14 | 2008-02-13 | 广东省电信有限公司研究院 | Method for realizing connected reinforced main-apparatus protection in automatic exchange optical network |
| CN100382504C (en) * | 2005-07-14 | 2008-04-16 | 广东省电信有限公司研究院 | Cross-over end-to-end connection setting method for main apparatus protection in automatic exchange optical network |
| CN100450020C (en) * | 2005-08-29 | 2009-01-07 | 华为技术有限公司 | Method and device for inverting mode match verifying of protected field both extremities protecting group |
| CN100461689C (en) * | 2005-01-19 | 2009-02-11 | 华为技术有限公司 | Method of protection of agent nodes in multi-layered automatic switching optical network |
| CN101651625B (en) * | 2009-09-03 | 2011-09-21 | 中兴通讯股份有限公司 | Route selecting device and route selecting method of multi-service restoration |
| US8463120B2 (en) | 2006-07-03 | 2013-06-11 | Huawei Technologies Co., Ltd. | Method, system and node device for realizing service protection in automatically switched optical network |
| CN101512968B (en) * | 2006-09-19 | 2013-10-09 | 华为技术有限公司 | Faults propagation and protection for connection oriented data paths in packet networks |
| CN103647598A (en) * | 2013-11-05 | 2014-03-19 | 国家电网公司 | Communication multi-level protection method based on intelligent optical network |
| US8867338B2 (en) | 2006-09-19 | 2014-10-21 | Futurewei Technologies, Inc. | Faults Propagation and protection for connection oriented data paths in packet networks |
| CN102142975B (en) * | 2010-02-01 | 2015-05-13 | 中兴通讯股份有限公司 | Method and system for service protection based on dual node interconnection protection structure in transmission network |
| CN105490906A (en) * | 2015-12-07 | 2016-04-13 | 中国船舶重工集团公司第七二二研究所 | Ring network protection method and device |
| CN108933684A (en) * | 2017-05-24 | 2018-12-04 | 中兴通讯股份有限公司 | SDN link failure processing method |
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- 2002-11-07 CN CNA02150136XA patent/CN1499747A/en active Pending
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| US7965938B2 (en) | 2004-09-10 | 2011-06-21 | Huawei Technologies Co., Ltd. | Method for mesh optical network service restoration |
| WO2006026930A1 (en) * | 2004-09-10 | 2006-03-16 | Huawei Technologies Co., Ltd. | A method for optical meshwork service restoration |
| CN1309216C (en) * | 2004-10-08 | 2007-04-04 | 烽火通信科技股份有限公司 | Method for controlling plane participation protective rotation in ASON network |
| CN100461689C (en) * | 2005-01-19 | 2009-02-11 | 华为技术有限公司 | Method of protection of agent nodes in multi-layered automatic switching optical network |
| CN100369419C (en) * | 2005-07-14 | 2008-02-13 | 广东省电信有限公司研究院 | Method for realizing connected reinforced main-apparatus protection in automatic exchange optical network |
| CN100382504C (en) * | 2005-07-14 | 2008-04-16 | 广东省电信有限公司研究院 | Cross-over end-to-end connection setting method for main apparatus protection in automatic exchange optical network |
| CN101160761B (en) * | 2005-07-15 | 2011-05-11 | 华为技术有限公司 | Link failure restoring method and apparatus |
| CN100446467C (en) * | 2005-07-15 | 2008-12-24 | 华为技术有限公司 | Restoring method for link fault |
| WO2007009360A1 (en) * | 2005-07-15 | 2007-01-25 | Huawei Technologies Co., Ltd. | Method for restoring link failure and apparatus thereof |
| CN100450020C (en) * | 2005-08-29 | 2009-01-07 | 华为技术有限公司 | Method and device for inverting mode match verifying of protected field both extremities protecting group |
| WO2007051388A1 (en) * | 2005-11-02 | 2007-05-10 | Huawei Technologies Co., Ltd. | A method for protecting the service flow and a network device |
| US8463120B2 (en) | 2006-07-03 | 2013-06-11 | Huawei Technologies Co., Ltd. | Method, system and node device for realizing service protection in automatically switched optical network |
| CN101512968B (en) * | 2006-09-19 | 2013-10-09 | 华为技术有限公司 | Faults propagation and protection for connection oriented data paths in packet networks |
| US8867338B2 (en) | 2006-09-19 | 2014-10-21 | Futurewei Technologies, Inc. | Faults Propagation and protection for connection oriented data paths in packet networks |
| CN101651625B (en) * | 2009-09-03 | 2011-09-21 | 中兴通讯股份有限公司 | Route selecting device and route selecting method of multi-service restoration |
| CN102142975B (en) * | 2010-02-01 | 2015-05-13 | 中兴通讯股份有限公司 | Method and system for service protection based on dual node interconnection protection structure in transmission network |
| CN103647598A (en) * | 2013-11-05 | 2014-03-19 | 国家电网公司 | Communication multi-level protection method based on intelligent optical network |
| CN103647598B (en) * | 2013-11-05 | 2016-01-06 | 国家电网公司 | A kind of communication many hierarchical protection method based on ASON |
| CN105490906A (en) * | 2015-12-07 | 2016-04-13 | 中国船舶重工集团公司第七二二研究所 | Ring network protection method and device |
| CN108933684A (en) * | 2017-05-24 | 2018-12-04 | 中兴通讯股份有限公司 | SDN link failure processing method |
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