CN102868544A - Method and system for realizing protection of shared gridding - Google Patents
Method and system for realizing protection of shared gridding Download PDFInfo
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Abstract
The invention discloses a method and a system for realizing the protection of a shared gridding. The method comprises the following steps that: APS (active protection switched) of a channel layer is arranged to a protection path, and TCM (tandem connection monitoring)) is arranged at each section of the protection path; when a working path has a fault, the starting node of the protection path transmits an APS message of the channel layer to an ending node; and crossed connection is built between the end points of shared protection respectively and the fault message is stored. By the method disclosed by the invention, the function of the APS can be expanded; and the method is combined with the deploy of the TCM, the speed of the protection switching is increased, and the reliability of a network is improved.
Description
Technical field
The present invention relates to the network protection technology, espespecially a kind of method and system that realize sharing grid protection.
Background technology
Along with the explosive growth of Internet service demand, as the transport network of basic network not only need large capacity, highly reliable, high flexibly, high-quality, also to support better IP operation to transmit.The existing SDH (Synchronous Digital Hierarchy) (SDH) that adopts time division multiplexing (TDM) technology, is good at carry voice traffic transmits network, can't satisfy sudden effective utilization to bandwidth of IP operation flow.And along with the application of ever-increasing the Internet and other multimedia services, need to there be a new Networking Solutions ﹠ provisioned to satisfy extensibility and the ease of manageability demand of bearer network, so optical transfer network (OTN, Optical Transport Network) technology has just been arisen at the historic moment.
OTN has merged the optical transport hierarchy of new generation of SDH and dense wave division multipurpose (WDM) system advantage.OTN combines the advantage of light territory and the processing of electric territory, and huge transmission capacity, the long connection of fully transparent end-to-end wavelength/wavelet and carrier-class protection are provided, and is the splendid technology of transmission broadband services of large granularities.
Along with the expansion of fiber capacity, it is more and more important that the reliability of optical-fiber network and viability also seem.The fault of optical fiber will cause losing of mass data, and because the impact of some human factor or environment, the fault of optical fiber is inevitable.
Therefore, carry out the key property that network protection is optical-fiber network.Usually, the realization of protection is to set up in advance one and the disjoint Protection path of operating path, when the operating path fault working flow is switched on the Protection path.Existing end-to-end protection mechanism is 1+1 protection normally; protection in 1: 1; be each bar work tap switching path (LSP; Label Switching Path) the protection LSP of bandwidth is monopolized in foundation; the protection bandwidth that needs at a link like this is that all are through the protection LSP bandwidth sum of described link; obviously, the existing network protected mode has taken a large amount of bandwidth resources, and these bandwidth resources can not be used for business.
In fact, in most situations, the probability that the many places fault occurs simultaneously is very little, among the RFC4872 is exactly to have proposed Shared restoration mechanism as prerequisite.In Shared restoration mechanism; article two, disjoint operating path; its Protection path shared resource, but in Shared restoration, the unactual resource that takies of Protection path; after detecting the fault of operating path; by the message activation Protection path of control plane, Protection path carries out switching of flow after activating; but Shared restoration need to activate processing, can't guarantee to protect the speed of switching.
In order to improve the protection speed of switching, economize on resources again simultaneously, in network, dispose share protect, but in the OTN network, the end points of shared resource be do not issue cross-coupled, direct converting flow.At first need to set up the path of Protection path, activate Protection path by control plane, speed is slower, can't reach the demand that protection is switched.
Fig. 1 is an existing concrete example sharing wireless mesh network (MESH) resist technology, and as shown in Figure 1, W1, W2 are working LSP, and its path is respectively A-B, C-D; Wherein, P1 is the Protection path of W1, and its path is A-E-F-B, and P2 is the Protection path of W2, and its path is C-E-F-D, P1 and P2 shared resource.Because what carry out is share protect, do not set up interconnection in start node and the end node of the shared link (E-F) of Protection path.When certain fault happens in operational, flow is carried out when switching in the path that needs protection, the interconnection that then at first needs to set up Protection path.After the interconnection of Protection path is successfully established, just can carry out switching of flow.
In current mechanism, because Protection path is obstructed, therefore, can't move APS (APS, the Automatic Protection Switched) mechanism of channel layer.If APS of target phase layer between every section then can cause each node to process APS message, thereby increase the processing complexity of intermediate node, so that carrying out flow when switching, the speed of setting up Protection path is slack-off.If adopt the APS scheme of section layer, suppose that at Linktype be optical channel transmission unit 4 (OTU4, Optical channel transport unit), and customer type is Optical Channel Data Unit-k 0 (ODU0, Optical Channel Data Unit), can carry 80 ODU0 among each ODU4, what carry out between the link is the exchange of ODU0, and what therefore share is the resource of ODU0; If the resource of each ODU0 is shared by three Protection paths, need among the APS of section layer then to identify that this Protection path belongs to is which ODU0 passage, also need simultaneously the identification protecting path to belong to which member in this protection group, this is equivalent to Protection path has been carried out the secondary coding, has increased the processing complexity of node; After if the more jumbo container such as ODU5 occurs, can cause the problems such as the Signal coding byte of APS is not enough.Therefore, the mode of section layer APS is more suitable for the share protect of high-order ODU.
In addition, share that the MESH protection relates to that resource discharges and resource such as seizes at the problem, existing APS can't satisfy its demand.
Summary of the invention
In view of this; main purpose of the present invention is to provide a kind of method and system that realize sharing grid protection, can realize the APS mechanism of channel layer, and abundanter protection demand is provided; thereby professional reliability is provided, reduces losing of data traffic.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of method that realizes sharing grid protection comprises,
Protection path is arranged the APS APS of channel layer, each section of Protection path is arranged Tandem Connection Monitor TCM;
When fault happens in operational, the start node of Protection path is to the APS message of end node sendaisle layer, and the end points of shared resource is set up respectively interconnection and storage failure information.
The start node of described Protection path is to the APS message of end node sendaisle layer, and the end points of shared resource sets up respectively interconnection and storage failure information specifically comprises:
The start node of described Protection path is the APS request switching messages of sendaisle layer downstream;
When the end points of shared resource receives the APS request switching messages of channel layer, preservation comprises the service priority of Protection path and the fault message of fault level in this locality, and carry out interconnection according to the connection identifier that request is carried in the switching messages and issue, and send downstream APS message;
When end node receives APS request switching messages, the APS acknowledge message of backward channel layer, and carry out bridge joint and selection; After start node receives the APS acknowledge message, select and bridge joint.
The method also comprises: when the operating path fault recovery, the resource of carrying out Protection path by the TCM layer discharges.
Described resource of carrying out Protection path by the TCM layer discharges and to comprise:
Behind the WTR of described start node timer expiry, carry out the switchback of flow, and send downstream the APS resource release message of newly-increased TCM layer;
When node receives resource release message, deletion interconnection, and the fault message of the Protection path of the local correspondence of preserving of deletion, and send downstream resource release message; Until end node receives resource release message, reply the affirmation message of TCM layer to start node as replying via Protection path.
The resource of described Protection path is carried out resource-sharing by many Protection paths; When multipoint fault occured, the method also comprised: according to the priority preempting resources.
Describedly specifically comprise according to the priority preempting resources: when other operating paths also break down; the start node of described shared resource compares according to the priority of two Protection paths; if the occupied resource of low priority; then discharge the resource conservation that low priority traffice takies, set up again the passage of new Protection path for high-priority service.
A kind of system that realizes sharing grid protection comprises end points, the end node of start node, shared resource at least; Wherein, between the end points of shared resource by many Protection path shared resources; Start node and end node are the head and the tail node of Protection path; Start node via shared end points to end node;
Described Protection path is provided with the APS APS of channel layer, and each section of described Protection path is provided with Tandem Connection Monitor TCM;
When fault happens in operational, the start node of Protection path is to the APS message of end node sendaisle layer, and the end points of shared resource is set up respectively interconnection and issued also storage failure information.
When described operating path fault recovery, the WTR timer expiry of described start node also is used for carrying out the switchback of flow, and sends downstream newly-increased APS resource release message, discharges with the resource of carrying out Protection path by the TCM layer.
The resource of described Protection path is carried out resource-sharing by many Protection paths; When multipoint fault occured, the start node of described shared resource also was used for, according to the priority preempting resources.
Can find out from the technical scheme that the invention described above provides; comprise the APS that Protection path is arranged channel layer; each section to Protection path arranges TCM; when fault happens in operational; the start node of Protection path is to the APS message of end node sendaisle layer, and the end points of share protect is set up respectively interconnection and storage failure information.By the inventive method as seen, the present invention has expanded the function of APS, and in conjunction with the deployment of TCM, has improved the speed that protection is switched, and has improved the reliability of network.
Description of drawings
Fig. 1 is the existing schematic diagram of sharing the MESH protection;
Fig. 2 is the flow chart that the present invention realizes the method for shared grid protection;
Fig. 3 is the schematic diagram that the present invention realizes the embodiment of shared grid protection;
Fig. 4 is the schematic diagram that the present invention realizes sharing the embodiment that Protection path is set up in the grid protection;
Fig. 5 is the schematic diagram that the present invention realizes the embodiment that the resource of Protection path in the shared grid protection discharges;
Fig. 6 is that the present invention realizes sharing the schematic diagram that the embodiment of multipoint fault occurs in the grid protection;
Fig. 7 is that the present invention realizes sharing when in the grid protection multipoint fault occuring the sequential chart of the embodiment that resource is seized;
Fig. 8 is the schematic diagram that the present invention realizes sharing the embodiment of multistage resource-sharing in the grid protection;
Fig. 9 is the present invention when realizing sharing in the grid protection multistage resource-sharing, the sequential chart of the embodiment that resource is seized.
Embodiment
Fig. 2 is the flow chart that the present invention realizes the method for shared grid protection, as shown in Figure 2, comprising:
Step 200: Protection path is arranged the APS of channel layer, each section of Protection path is arranged TCM.
In the inventive method, at first, in network, Protection path is disposed the APS of channel layer, each section of Protection path is disposed Tandem Connection Monitor (TCM, Tandem Connection Monitoring) mechanism, share grid protection to realize the present invention.
Concrete, many operating paths and many corresponding Protection paths are set, wherein, there is shared resource between many Protection paths, in the present embodiment, describe as an example of two operating paths and two Protection paths example;
The first operating path and the second operating path respectively have a Protection path, suppose to be respectively the first Protection path and the second Protection path, and there is shared resource in these two Protection paths; If two Protection paths of shared resource incoming interface on certain node is different, but outgoing interface is identical, then this node is called shared start node (SSN, Shared Start Node); If two Protection paths of shared resource outgoing interface on certain node is different, but incoming interface is identical, then this node is called shared end node (SEN, Shared End Node); Two Protection paths of shared resource are shared resource on the path of sharing between start node and the shared end node; For example, as shown in Figure 3, W1 is the first operating path, the first Protection path P1 is the Protection path of W1, and W2 is the second operating path, and the second Protection path P2 is the Protection path of W2, the path of P1 process is A-E-F-B, the path of P2 process is C-E-F-D, and P1 and P2 be through path E-F, shared resource on E-F; Wherein, node E is for sharing start node, and node F is for sharing end node; Node E, node F can be referred to as shared end points again; Protection at shared end points, is not set up interconnection before switching;
As shown in Figure 3: dispose APS at the end points of Protection path P1 and P2, at every section deploy TCM of P1, i.e. PS1, PS3, PS4, before protection was switched, PS1 and PS3 were not carry out bridge joint between PS3 and the PS4; Similar, P2 is by PS2, PS3, and PS5 consists of.Wherein, the PS3 section is shared by P1 and P2.
Step 201: when fault happens in operational, the start node of Protection path is to the APS message of end node sendaisle layer, and the end points of shared resource is set up respectively interconnection and storage failure information.
Among the present invention, dispose end-to-end APS at Protection path, still, because Protection path does not issue interconnection, therefore, Protection path can't move end to end APS message, the path of necessary model Protection path.
In this step, when operating path detected fault, the start node of Protection path is APS request switching messages such as signal fault (SF, the Signal Fail) message of sendaisle layer downstream.Owing to do not set up interconnection in start node and the end node of shared link, therefore, the APS message that the end points of shared link can the treatment channel layer, and order is transmitted downstream.When the end points of shared resource receives the SF message of channel layer; need to preserve in this locality simultaneously the fault messages such as the service priority of Protection path and fault level; and carry out interconnection according to the connection identifier that carries in the SF message and issue, and send downstream APS message.When the end node of Protection path receives SF message, return end to end reverse request (RR, Reverse Request) message, and carry out bridge joint and selection.After the start node A of Protection path receives RR message, select and bridge joint.
As shown in Figure 3, node E is bridged to PS3 with PS1 after receiving SF message from the APS of the start node A of Protection path, preserves simultaneously the fault message of P1, and namely fault type is SF, continues to send downstream APS message;
Node F after receiving the SF message of APS joins PS3 and PS4, and other processing is consistent with node E, repeats no more here;
Receive the SF message of APS as the end node B of Protection path after, carry out local selection and bridge joint, reply simultaneously end to end APS acknowledge message such as RR message, expression is to the affirmation of the SF message of APS;
After the start node A of Protection path receives RR message, select and bridge joint.
So far, protect the flow process of switching to finish.Wherein, owing to by SF message, got through Protection path, therefore, for arriving end to end RR message, intermediate node can not processed it.
Need to prove that in the present invention, causing protecting the APS request type of switching not only can be SF; can also be degradation of signals (SD, Signal Degrade), force handoff (MS; Manual Switch) etc., only be described as an example of SF example in the present embodiment.
Further, the inventive method also comprises step 202: when the operating path fault recovery, the resource of carrying out Protection path by the TCM layer discharges.
In the inventive method, the request type of expansion APS, newly-increased request type are that resource discharges (RE, release), and its priority ratio Wait-to-Restore (WTR, wait-to-restore) is low, and is higher than RR.After node receives RE message, can carry out the release of resource, the interconnection that deletion is local.
In the methods of the invention, dispose TCM in each section of Protection path.After operating path recovers, carry out the release of resource by the TCM layer.Specifically comprise: behind the WTR of start node timer expiry, carry out the switchback of flow, then send downstream the RE message of TCM layer, when node receives RE message, deletion interconnection, and the fault message of the Protection path of the local correspondence of preserving of deletion, and send downstream RE message; When end node receives RE message, via Protection path, reply the RR message of TCM layer to start node as replying.
By the inventive method as seen, the present invention has expanded the function of APS, and the APS message by channel layer issues interconnection at the end points of share protect; set up the path of Protection path; and in conjunction with the deployment of TCM, APS has improved the speed that protection is switched end to end, has improved the reliability of network.
Because the resource of Protection path of the present invention is carried out resource-sharing by many Protection paths, therefore, when multipoint fault, further, the inventive method also comprises: the seizing of resource.The principle that resource is seized is that the high person of priority takies resource.Wherein, priority can be divided into fault priority or service priority, and the preemptive policy that sets in advance according to this locality carries out the comparison of priority.Occupation condition and the state of Protection path are preserved by this locality.When other operating paths also break down; because the end points of operating path can't be known the situation that takies of shared resource; can send at Protection path the failure message of operating path; compared by the start node of the shared resource priority according to two Protection paths; if low priority take resource; then discharge the resource conservation that low priority traffice takies, set up again the passage of new Protection path for high-priority service.
In the present invention, protection group is encoded, the Protection path in the identical protection group carries out sharing of resource.Simultaneously, the Protection path in the protection group is encoded, be used for identifying Protection path.
For the inventive method, a kind of system that realizes sharing grid protection also is provided, comprise at least end points, the end node of start node, shared resource; Wherein, start node and end node are the head and the tail node of Protection path, start node via shared end points to end node; Between the end points of shared resource by many Protection path shared resources;
Described Protection path arranges the APS APS of channel layer, and each section of described Protection path is provided with Tandem Connection Monitor TCM;
When fault happens in operational, the start node of Protection path is to the APS message of end node sendaisle layer, and the end points of shared resource is set up interconnection and storage failure information.
When described operating path fault recovery, the WTR timer expiry of described start node also is used for carrying out the switchback of flow, and sends downstream newly-increased APS resource release message such as the RE message of TCM layer, discharges with the resource of carrying out Protection path by the TCM layer.
The resource of described Protection path is carried out resource-sharing by many Protection paths; When multipoint fault occured, the start node of described shared resource also was used for, according to the priority preempting resources.
Fig. 3 is the schematic diagram that the present invention realizes the embodiment of shared grid protection,, supposes in the present embodiment that W1 is operating path in conjunction with Fig. 1, and P1 is the Protection path of W1, and W2 is operating path, and P2 is the Protection path of W2.The path of P1 process is A-E-F-B, is made of three sections of PS1-PS3-PS4, and the path of P2 process is C-E-F-D, is made of PS2-PS3-PS5.P1 and P2 share the resource of PS3 section.
And, in the present embodiment, suppose that PS1, PS2, PS3, PS4, PS5 are OTU2 type links.Can carry 8 ODU0 among the ODU2, namely can set up the protection group of 8 OUD0, in this example, take one of them ODU0 protection group as example, in this share protect group, two members be arranged, P1 and P2, the resource of shared ODU0.Each section at the protection link is disposed TCM, and what TCM took is the expense of ODU0.
In Fig. 3, node E is for sharing start node, and node F is for sharing end node.
What share in this example, is the resource of ODU0.Sharing the client signal that carries on the path is ODU0.In start node and the end node shared, because being two Protection paths, resource shares, therefore, do not issue interconnection.
When fault happens in operational, at first issue the interconnection of Protection path, form the path of Protection path, just can carry out switching of flow.The foundation of the Protection path of share protect is as shown in Figure 4:
Step is 1.: operating path W1 detects fault, and SF (1, the 1) message of start node A sendaisle layer arrives downstream node E;
Step is 2.: after node E received SF (1,1) message, the connection identifier according to the Protection path that carries in SF (1, the 1) message issued interconnection, and PS1 and PS3 are carried out bridge joint; Simultaneously, preserve the fault type that protection connects PS1 in this locality, for example, SF message then fault type is SF, if type of message is SD, then fault type is SD; And continue to downstream node F and send SF (1,1) message;
Step is 3.: after node F received SF (1,1) message, the connection identifier according to Protection path issued interconnection, and PS3 and PS4 are carried out bridge joint; Simultaneously, preserve the fault type that protection connects PS1 in this locality; And continue to downstream node B and send SF (1,1) message;
Step is 4.: end node B carries out bridge joint and selection after receiving SF (1,1) signal; Then reply RR (1, the 1) message of a channel layer to start node, expression is replied;
Start node A carries out bridge joint and selection after receiving RR (1,1).
So far, the flow of operating path is switched on the Protection path.Owing to issue interconnection by SF message, Protection path PS1 forms, and therefore, although RR message can not processed it through intermediate node, by start node it is processed, and has improved like this speed that protection is switched.
After operating path recovers, need to the flow switchback to operating path, need simultaneously the shared resource that has taken on the Protection path is discharged.The shared resource that occupies on the Protection path must in time discharge, and can mention like this speed that protection is switched.If when the operating path fault recovery; there is not the shared resource on the release guard path; when other fault happens in operational; must discharge first shared resource; could set up new interconnection; because the request switching messages is the APS of channel layer, if releasing resource not can cause the problems such as wrong company.Discharge first again connection, can cause protecting the overlong time of switching, can't satisfy the time requirement that protection is switched.Fig. 5 is the schematic diagram that the present invention realizes the embodiment that the resource of Protection path in the shared grid protection discharges; as shown in Figure 5; in this enforcement; between each section, all need to dispose TCM; be all to dispose TCM on PS1, PS2, PS3, PS4, the PS5, in topology shown in Figure 5, deployment be the TCM of individual layer; that therefore, select in this example is TCM1.In this example, APS is divided into the APS of channel layer and the APS of TCM layer, and (MFAS, MultiFrame Alignment Signal) identifies by the multiframe aligned signal.When sending TCM message, MFAS=001, the APS of expression TCM1 layer.
Start node and end node are sent out WTR (1,1) message mutually, and expression need to be carried out the switchback of flow.Start node and end node arrange in this locality and startup WTR timer; The WTR timer time arrives, and start node and end node switch to operating path with flow from Protection path; Then the resource of initiating Protection path discharges.The resource release flow of Protection path is as follows:
Step is 1.: node A to downstream node E sends TCM message, at this moment, MFAS=001, expression is TCM1, message is that the release of resource is carried out in RE (0,1) expression;
Step is 2.: after node E receives RE (0,1), discharge the interconnection of PS1 and PS3, and link information and the fault type of the local former P1 that protects of deletion; Node E sends local TCM message RE (0,1) to its downstream node F, the resource of request release guard path P 1;
Step is 3.: after node F receives RE (0,1), discharge the interconnection of PS1 and PS3, and link information and the fault type of the local former P1 that protects of deletion.Node F sends local TCM message RE (0,1), the resource of request release guard path P 1;
Step is 4.: after end node B receives RE (0,1) message, reply RR (0, the 1) message of TCM layer, expression is replied;
Step is 5.: the F point receives RR (0,1) message, does not process, and replys via node E (node E does not process yet) and arrives the A point;
Step is 6.: after start node A receives RR (0,1), learn that the resource on the Protection path PS1 has discharged successfully; The A node sends NR (0, the 1) message of TCM layer to downstream node, the idle condition of expression Protection path.
In share protect, because the resource of Protection path is shared by two Protection paths, when the operating path of shared resource breaks down simultaneously, then seizing of resource can occur.When resource was seized, the high person of priority occupied resource, and priority is divided into fault priority, service priority etc.Priority is processed according to the strategy of this locality configuration, and the high person of priority takies resource.
Fig. 6 is that the present invention realizes sharing the schematic diagram that the embodiment of multipoint fault occurs in the grid protection, in conjunction with shown in Figure 6, supposes that W1 breaks down; P1 has taken the resource in shared path, and between the W1 age at failure, fault has also occured W2; at this moment, need to carry out the processing of seizing of resource.In this example, the priority of supposing P2 is higher than P1.The resource of multipoint fault is seized sequential chart as shown in Figure 7:
Step 700: after node C detects fault, to the APS message SF (2,2) of its downstream node E sendaisle layer.
Step 701: node E receives SF (2,2) after the message, detect local resource, find that shared resource is occupied by P1, compare fault priority and the service priority of P1 and P2, the priority that draws P2 is higher than the priority of P1, then keeps (hold) SF (2,2) message, and begin to ask the P1 releasing resource;
Resource discharges comprises step 702～step 708: it is node A and Node B that LO (1, the 1) message of node E point sendaisle layer is divided two end points that are clipped to Protection path P1; After node A point received LO (1,1) message, because the priority of LO is higher than the priority of SF, therefore, node A point stopped to the Protection path transmitted traffic; The B point also stops to the Protection path transmitted traffic simultaneously; Node A is to RE (0, the 1) message of node E point transmission TCM layer, i.e. request discharges the resource of P1; After downstream node receives RE message, discharge local resource, and transmit downstream RE message; After Node B receives RE message, reply RR (0, the 1) message of TCM layer, the affirmation that expression discharges resource; Intermediate node receives RR (0,1) message, and upstream nodes is replied RR (0,1) message; Node A receives RR (0,1) message, and the expression resource discharges successfully.
Step 709: node E point receives RR (0,1) message, represents that then the Protection path resource of P1 is released, and then begins to set up new interconnection, is about to PS2 and is bridged to PS3, continues simultaneously to send SF (2,2) message;
Step 710: after node F receives SF (2,2) message, because this locality does not have resource occupied, then check the Protection path sign in the SF message, according to the Protection path sign PS3 is bridged to PS5; And send downstream SF (2,2) message;
Step 711: node D receives SF (2,2) message, carries out bridge joint and selection; And answer RR (2,2) message;
Step 712: node C carries out bridge joint and selection after receiving RR (2,2) message.
Fig. 8 is the schematic diagram that the present invention realizes sharing the embodiment of multistage resource-sharing in the grid protection, as shown in Figure 8, in sharing grid protection, may dispose and carry out sharing of resource between a plurality of sections.Owing to do not carry out the announcement of the state of Protection path, therefore, possible certain protection is in the success of the first shared segment resource reservation, but on the shared segment of follow-up other, resource reservation is failed.As shown in Figure 8, in the present embodiment, W1, W2, W3 are operating path, and P1, P2, P3 are respectively its corresponding Protection path, the resource of P1 and P2 sharing E-F link, the resource on P1 and the P3 share I-H link.In the present embodiment, suppose that W3 breaks down, P3 has taken shared resource, and not between convalescence, fault has also occured W1 at W3.And in the present embodiment, suppose that the priority of P3 is higher than P1.Fig. 9 is the present invention when realizing sharing in the grid protection multistage resource-sharing, and the sequential chart of the embodiment that resource is seized as shown in Figure 9, comprising:
Step 900: node A sends SF (1,1) message to downstream node;
Step 901: downstream node E, F issue interconnection after receiving SF (1,1);
Step 902: node I receives SF (1,1) after, detect local resource, find that shared resource is occupied by P3, then begin fault priority and the service priority of comparison P1 and P3, find that the priority of P3 is higher than the priority of P1, then keep (hold) SF (1,1) message, and begin to ask the P1 releasing resource.
Resource discharges and comprises step 903～step 909: LO (1, the 1) message of node I sendaisle layer is to the end node A of Protection path P1; After node A received LO (1,1) message, because the priority of LO is higher than the priority of SF, node A point was to RE (0, the 1) message of node E transmission TCM layer, i.e. request discharges the resource of P1; After downstream node E, F receive RE message, discharge local resource, and transmit RE message to its downstream; After node I receives RE (0,1) message, reply RR (0, the 1) message of TCM layer, the affirmation that expression discharges resource; Intermediate node receives RR (0,1) message, and upstream nodes is replied RR (0,1) message; Node A receives RR (0,1) message, and the expression resource discharges successfully.
Because being connected to before the P1 of P3 set up, and P1 seizes failure, therefore, above step on the path of P3 without any impact.
The above is preferred embodiment of the present invention only, is not for limiting protection scope of the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a method that realizes sharing grid protection is characterized in that, comprise,
Protection path is arranged the APS APS of channel layer, each section of Protection path is arranged Tandem Connection Monitor TCM;
When fault happens in operational, the start node of Protection path is to the APS message of end node sendaisle layer, and the end points of shared resource is set up respectively interconnection and storage failure information.
2. method according to claim 1 is characterized in that, the start node of described Protection path is to the APS message of end node sendaisle layer, and the end points of shared resource sets up respectively interconnection and storage failure information specifically comprises:
The start node of described Protection path is the APS request switching messages of sendaisle layer downstream;
When the end points of shared resource receives the APS request switching messages of channel layer, preservation comprises the service priority of Protection path and the fault message of fault level in this locality, and carry out interconnection according to the connection identifier that request is carried in the switching messages and issue, and send downstream APS message;
When end node receives APS request switching messages, the APS acknowledge message of backward channel layer, and carry out bridge joint and selection; After start node receives the APS acknowledge message, select and bridge joint.
3. method according to claim 1 is characterized in that, the method also comprises: when the operating path fault recovery, the resource of carrying out Protection path by the TCM layer discharges.
4. method according to claim 3 is characterized in that, described resource of carrying out Protection path by the TCM layer discharges and to comprise:
Behind the WTR of described start node timer expiry, carry out the switchback of flow, and send downstream the APS resource release message of newly-increased TCM layer;
When node receives resource release message, deletion interconnection, and the fault message of the Protection path of the local correspondence of preserving of deletion, and send downstream resource release message; Until end node receives resource release message, reply the affirmation message of TCM layer to start node as replying via Protection path.
5. according to claim 1 or 3 described methods, it is characterized in that the resource of described Protection path is carried out resource-sharing by many Protection paths; When multipoint fault occured, the method also comprised: according to the priority preempting resources.
6. method according to claim 5; it is characterized in that; describedly specifically comprise according to the priority preempting resources: when other operating paths also break down; the start node of described shared resource compares according to the priority of two Protection paths; if the occupied resource of low priority; then discharge the resource conservation that low priority traffice takies, set up again the passage of new Protection path for high-priority service.
7. a system that realizes sharing grid protection is characterized in that, comprises at least end points, the end node of start node, shared resource; Wherein, between the end points of shared resource by many Protection path shared resources; Start node and end node are the head and the tail node of Protection path; Start node via shared end points to end node;
Described Protection path is provided with the APS APS of channel layer, and each section of described Protection path is provided with Tandem Connection Monitor TCM;
When fault happens in operational, the start node of Protection path is to the APS message of end node sendaisle layer, and the end points of shared resource is set up respectively interconnection and issued also storage failure information.
8. system according to claim 7; it is characterized in that; when described operating path fault recovery; the WTR timer expiry of described start node; also be used for carrying out the switchback of flow; and send downstream newly-increased APS resource release message, discharge with the resource of carrying out Protection path by the TCM layer.
9. according to claim 7 or 8 described systems, it is characterized in that the resource of described Protection path is carried out resource-sharing by many Protection paths; When multipoint fault occured, the start node of described shared resource also was used for, according to the priority preempting resources.
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