CN1556637A - Method of proceeding failure recovery using shared spare passage in lattice shape network - Google Patents
Method of proceeding failure recovery using shared spare passage in lattice shape network Download PDFInfo
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Abstract
The invention relates to a method for carrying on failure restoration using shared backup channel in grating network, the method presets a backup channel when creating the primary channel, the backup channel presetting uses share mode, that is to say, the same resources can be used as the preset resources for several backup channels, when the primary channel is failed, it uses the label exchanging protocol to execute the signaling activating process of the backup channel, when one of the shared backup channel is activated, the other backup channels which carry on resources sharing to the activated channel are removed, then calculates these backup channels again. The invention uses sharing protection, upgrades the utilization rate of resources, because of the preset backup channel, the process activating the backup channel is simple and quick.
Description
Technical field
The present invention relates to a kind ofly in trellis (Mesh) net, utilize shared backup channel to carry out the method for fault recovery, can be applicable to the backbone network of optical communication, the metropolitan area network field.
Background technology
Along with the fast development of Automatic Switched Optical Network Technology, it has brought the control device of a lot of automations to optical-fiber network in recent years, and for example: neighbours find automatically, automatic topological discover or the like, and the change that brings aspect optical network reliability simultaneously also is huge.
The introducing of control plane requires the ASON node to have distributed processing power.Distributed processing power makes grid network recovery that the possibility that realizes arranged.Centralized recovery in the grid network is because its recovery time long (being a minute level), and is not widely used.Distributed grid network can shorten to recovery time a millisecond magnitude, thereby makes the practicability of grid network recovery become possibility.
Fault recovery (recovery) is the recovery of supporting the datum plane fault by the mechanism of control plane, comprises the content-protection (protection) of two aspects and repairs (restoration).They are whether to preset by resource to be distinguished, and protection need be preset resource and be repaired not to be needed.Be better than reparation from recovery time protection, and from the height of resource utilization, then just in time opposite.
Legacy network, for example in synchronous digital hierarchy (SDH) looped network, the main mode that adopts protection under such mode, has 50% resource to be used for redundancy, and resource utilization is low.When twice fault took place link, the phenomenon that some online business can't be protected can take place.Comparatively speaking, the recovery in the grid network can effectively overcome above shortcoming, and it not only has higher resource utilization and certain ability of dealing with repeatedly fault, also has the recovery time of approaching looped network protection simultaneously.
The recovery of the faulty tag switching path (LSP) in the grid network mainly contains the gravity treatment road, recovers passage precomputation, resource reservation and four kinds of modes of label preassignment.Be described below respectively:
After the reset mode on gravity treatment road was meant that service aisle breaks down, the routing algorithm was searched alternate channel in network, started signaling procedure then and set up alternate channel to replace the fail operation passage;
The reset mode of recovering the passage precomputation is meant that master channel breaks down, and starts signaling procedure in real time and sets up alternate channel to replace the fail operation passage on the passage that calculating is good in advance;
The reset mode of resource reservation is meant has calculated alternate channel in advance, and signaling procedure has been done resource reservation according to the route of being calculated, and signaling procedure is set up alternate channel when fault takes place, and adopts the mode of real-time local distributing labels in the process of foundation;
The preallocated reset mode of label is meant has calculated alternate channel in advance, and local label has also been allocated in advance in the computational process, and when fault takes place, signaling procedure is set up the physical channel according to precalculated route and pre-assigned label.
Summary of the invention:
The purpose of this invention is to provide a kind of method of utilizing shared backup channel to carry out fault recovery in grid network, this method comprises the steps:
Receive connection request by the Web portal node, start routing calculation module and calculate two routes, one is used for master channel, and another is used for alternate channel;
Carry out the signaling procedure of setting up master channel and alternate channel respectively;
Set up the main channel, use the signaling protocol of standard, for example the limited tag distribution protocol (GMPLS CR-LDP) of the RSVP expansion (GMPLS RSVP-TE) of general multiple protocols label exchange or the exchange of general multiple protocols label;
Set up alternate channel, use the signaling procedure and the relevant signaling of expansion, and be alternate channel reservation label or resource, label that this alternate channel is reserved or resource are for sharing formula, and promptly this label or resource can be shared by a plurality of alternate channel;
After detecting the main channel and breaking down, initiate alternate channel by the Ingress node of label switched path or Egress node and activate signaling procedure;
When one of alternate channel of sharing is activated, carry out other alternate channel of resource-sharing with this alternate channel that is activated and remove request to source node transmission alternate channel separately, after source node receives alternate channel dismounting request, initiate the signaling procedure that alternate channel is removed, remove these alternate channels, and the notice explorer upgrades relevant information;
After finishing alternate channel and removing, corresponding source node recomputates the route of alternate channel separately, and re-executes alternate channel and set up process, for other main channel rebulids alternate channel, with substitute split except alternate channel.
Method of the present invention is in concrete the use, and the foundation of alternate channel can be adopted dual mode:
First kind of mode
Preassignment label mode, promptly distributing labels is not set up interconnection, and label can be shared.In this manner, label manager is that alternate channel institute distributed labels can be shared, and that is to say that certain label may belong to a plurality of standby label switched paths (LSP) passage simultaneously.Label manager notice explorer upgraded corresponding resource information after label distribution was finished.Label manager can not send the cross-coupled request of setting up to Switch Controller.
The activation of alternate channel is as follows under this mode, and label manager is initiated cross-coupled request according to preallocated label to Switch Controller, removes other alternate channel of sharing with it simultaneously, and the notice explorer upgrades relevant information.When other alternate channel of sharing is removed, can trigger the process of setting up of corresponding alternate channel, for setting up new alternate channel in other main thoroughfare.
For preassignment label mode, the signaling procedure that alternate channel is removed can require each node on the passage to discharge preallocated label, upgrades corresponding resource information then.
The second way
The reserved resource mode, promptly distributing labels is not only carried out resource reservation.In this manner, label manager is distributing labels not, only notifies explorer to upgrade corresponding resource information (mainly referring to bandwidth information).Label manager can not send the cross-coupled request of setting up to Switch Controller yet.
The activation of alternate channel is as follows under this mode, label manager at first will utilize reserved resource to carry out label distribution, initiate cross-coupled request to Switch Controller then, remove other alternate channel of sharing with it simultaneously, and the notice explorer upgrades relevant information.When other alternate channel of sharing is removed, can trigger the process of setting up of corresponding alternate channel, for setting up new alternate channel in other main thoroughfare.
For the reserved resource mode, the process that alternate channel is removed only is that the notice explorer upgrades corresponding resource information.
The inventive method can be used for trellis (Mesh) net be made up of synchronous digital hierarchy (SDH)/Synchronous Optical Network (SONET) equipment, also can be used for optical cross connect (OXC, Optical Cross Connect) trellis (Mesh) net formed of other equipment such as equipment, go for any network node, promptly can be User Network Interface (UNI) node, can also be subnet management system (EMS) node/network management system (nms) node.
Method of the present invention has the effect of following several respects:
One, in calculating the route step, calculated the alternate channel route in advance, active and standbyly all be kept in the local node with the passage relevant information.The process that alternate channel activates does not need to calculate route, and signaling procedure is simple, thereby has shortened the time of business recovery.When for example using the reset mode of GMPLS RSVP-TE signaling and preassignment label, can adopt Egress node directly to send signaling message and activate alternate channel.
Two, the kinds of protect pattern be can be used for, 1:1,1:N, M:N and (1:1) for example can be applied to simultaneously
nProtected mode.
Three, use the share protect mode, a protection link can be protected many active links, has improved the resource utilization of network.
Description of drawings
Fig. 1 the inventive method is set up the schematic diagram of master channel and alternate channel in latticed network;
The schematic diagram of the employed node control module of Fig. 2 the inventive method;
The alternate channel of Fig. 3 preassignment label of the present invention is set up process;
The alternate channel of Fig. 4 reserved resource of the present invention is set up process;
The alternate channel activation of Fig. 5 preassignment label of the present invention;
The alternate channel activation of Fig. 6 reserved resource of the present invention;
Demolishing process after Fig. 7 alternate channel shared segment of the present invention is occupied;
The alternate channel demolishing process of Fig. 8 intranodal preassignment of the present invention label;
The demolishing process of the alternate channel of Fig. 9 intranodal reserved resource of the present invention;
The primary channel of Figure 10 preassignment label of the present invention is set up embodiment;
The alternate channel of Figure 11 preassignment label of the present invention activates embodiment;
The primary channel of Figure 12 reserved resource of the present invention is set up embodiment;
The passage that is equipped with of Figure 13 reserved resource of the present invention activates embodiment;
Another alternate channel 2 was removed and newly-built embodiment when alternate channel 1 of Figure 14 the present invention was activated.
Embodiment
Explain know-why of the present invention and specific implementation in detail below in conjunction with accompanying drawing.
At first, the present invention to provide a kind of when grid network adopt to be shared formula and is recovered alternate channel method for building up and when master channel breaks down the Activiation method of alternate channel.The signaling protocol of standard is used in the foundation of master channel, for example the limited tag distribution protocol (GMPLS CR-LDP) of the reserved resource protocol extension (GMPLS RSVP-TE) of general multiple protocols label exchange or the exchange of general multiple protocols label.And alternate channel foundation need be to the related expanding of carrying out of signaling procedure and signaling thereof.The present invention only considers the signaling schemes of network node, is that UNI client or EMS/NMS then do not distinguish as for the promoter who connects.The Ingress node of network receives after the connection request, at first can trigger routing calculation module and calculate route, here the route that will calculate has two: one is used for master channel, and another is used for alternate channel (if adopt the reset mode on gravity treatment road, then not needing to calculate the route of alternate channel).Master channel and alternate channel were initiated the signaling procedure that passage is set up respectively after route was calculated and finished.See Fig. 1.Fig. 2 is the controll block block diagram of individual node.
The foundation of alternate channel can be adopted dual mode: preassignment label mode as shown in Figure 3, and promptly distributing labels is not set up interconnection, and label can be shared.In this manner, label manager is that alternate channel institute distributed labels can be shared, and that is to say that certain label may belong to a plurality of standby LSP passages simultaneously.Label manager notice explorer upgraded corresponding resource information after label distribution was finished.Label manager can not send the cross-coupled request of setting up to Switch Controller.Reserved resource mode as shown in Figure 4, promptly distributing labels is not only carried out resource reservation.In this manner, label manager is distributing labels not, only notifies explorer to upgrade corresponding resource information (mainly referring to bandwidth information).Label manager can not send the cross-coupled request of setting up to Switch Controller yet.
After detecting master channel and breaking down, the Ingress node of LSP or Egress node are initiated the signaling procedure that alternate channel activates.The process of activation alternate channel as shown in Figure 5 under first kind of mode, label manager is initiated cross-coupled request according to preallocated label to Switch Controller, remove other alternate channel of sharing with it simultaneously, and the notice explorer upgrades relevant information.When other alternate channel of sharing is removed, can trigger the process of setting up of corresponding alternate channel, for setting up new alternate channel in other main thoroughfare.The process of activation alternate channel as shown in Figure 6 under the second way, label manager at first will be carried out label distribution, initiate cross-coupled request to Switch Controller then, remove other alternate channel of sharing with it simultaneously, and the notice explorer upgrades relevant information.When other alternate channel of sharing is removed, can trigger the process of setting up of corresponding alternate channel, for other master channel is set up new alternate channel.
When having one to activate in the alternate channel of sharing, other alternate channel of sharing this part label or resource is removed request to source node transmission alternate channel separately, source node is initiated the signaling procedure that alternate channel is removed after receiving alternate channel dismounting request, sees Fig. 7.Set up mode for first kind, the signaling procedure that alternate channel is removed is exactly the process that discharges the preassignment label, and each node on the passage can discharge preallocated label, upgrades corresponding resource information then, sees Fig. 8.Set up mode for second kind, the process that alternate channel is removed is the process that discharges pre-resource, and each node on the passage can notify explorer to upgrade corresponding resource information, sees Fig. 9.Finish after the demolishing process of alternate channel reserved resource or reservation label, corresponding source node can recomputate the route of alternate channel, initiates the process of setting up of new alternate channel then, and it sets up process and the alternate channel of description before, and to set up process identical.
Figure 10 has described the case study on implementation that adopts MESH network recovery under first kind of mode.Master channel 1 is through node A, B, C, D, and alternate channel 1 is through node A, E, F, D.Master channel 2 is through node G, H, I, J, and alternate channel 2 is through node G, E, F, J.Article two, master channel uses the label resources among common node E and the node F, and through common link section E-F, constitutes the share protect relation.After master channel 1 broke down, signaling was initiated the activation of alternate channel 1, sees Figure 11, and the label manager on node A, E, F, the D sends to Switch Controller and sets up cross-coupled request, sets up the actual physical link by Switch Controller.
Figure 12 has described the case study on implementation that adopts MESH network recovery under first kind of mode.Master channel 1 is through node A, B, C, D, and alternate channel 1 is through node A, E, F, D reserved resource.Master channel 2 is through node G, H, I, J, and alternate channel 2 is through node G, E, F, J reserved resource.Article two, master channel uses the resource among common node E and the node F, and through common link section E-F, constitutes the share protect relation.After master channel 1 breaks down, signaling is initiated the activation of alternate channel 1, see Figure 13, the label manager distributing labels on node A, E, F, the D sends to Switch Controller then and sets up cross-coupled request, sets up the actual physical link by Switch Controller.
Be retracted and utilize other resource to reserve again with the resource of the alternate channel 2 of alternate channel 1 shared resource.Figure 14 has described the example that alternate channel is removed and rebuild.After alternate channel 1 activated, E-F was occupied for the shared link section, and node E finds shared protection passage 2 according to link sharing information, and sent the request of removing alternate channel 2 to the source node G of protection passage 2.Node G starts the signaling procedure that alternate channel 2 is removed after receiving alternate channel dismounting request, discharges alternate channel 2 preassignment label or reserved resources.Source node G confirms to recomputate after alternate channel 2 has been removed the route of alternate channel 2, initiates the process of reconstruction of alternate channel 2 then.This process is the same with Fig. 3 or the described process of Fig. 4, and the just current alternate channel of setting up 2 is G-M-N-J.
The foregoing description and accompanying drawing only are for illustrative purposes, and the protection range to the inventive method is not construed as limiting, and the protection range of the inventive method is limited by incidental claims.
Claims (6)
1. method of in grid network, utilizing shared backup channel to carry out fault recovery, the method comprising the steps of:
Receive connection request by the Web portal node, start routing calculation module and calculate two routes, one is used for master channel, and another is used for alternate channel;
Carry out the signaling procedure of setting up master channel and alternate channel respectively;
Set up the main channel, use the signaling protocol of standard, for example the limited tag distribution protocol (GMPLS CR-LDP) of the RSVP expansion (GMPLSRSVP-TE) of general multiple protocols label exchange or the exchange of general multiple protocols label;
Set up alternate channel, use the signaling procedure and the relevant signaling of expansion, and be alternate channel reservation label or resource, label that this alternate channel is reserved or resource are for sharing formula, and promptly this label or resource can be shared by a plurality of alternate channel;
After detecting the main channel and breaking down, initiate alternate channel by the Ingress node of label switched path or Egress node and activate signaling procedure;
When one of alternate channel of sharing is activated, carry out other alternate channel of resource-sharing with this alternate channel that is activated and remove request to source node transmission alternate channel separately, after source node receives alternate channel dismounting request, initiate the signaling procedure that alternate channel is removed, remove these alternate channels, and the notice explorer upgrades relevant information;
After finishing alternate channel and removing, corresponding source node recomputates the route of alternate channel separately, and re-executes alternate channel and set up process, for other main channel rebulids alternate channel, with substitute split except alternate channel.
2. according to the method for claim 1, it is characterized in that:
Alternate channel is set up and is used preassignment label mode, does not set up interconnection, and label manager is that alternate channel institute distributed labels is shared, and promptly certain label can belong to a plurality of standby label switched paths simultaneously;
After label distribution was finished, label manager notice explorer upgraded corresponding resource information, and label manager can not send the cross-coupled request of setting up to Switch Controller;
When using alternate channel, label manager is initiated cross-coupled request according to preallocated label to Switch Controller, removes other alternate channel that shared relationship is arranged with it simultaneously, and the notice explorer upgrades relevant information;
When other alternate channel of sharing was removed, the alternate channel that triggers was separately set up process, sets up new alternate channel respectively.
3. according to the method for claim 2, it is characterized in that: the signaling procedure that alternate channel is removed can require each node on the passage to discharge preallocated label, upgrades corresponding resource information then.
4. according to the method for claim 1, it is characterized in that:
The distributing labels mode is not used in the foundation of alternate channel, only carries out resource reservation, is the alternate channel bandwidth reserved;
Label manager is distributing labels not, only notifies explorer to upgrade corresponding resource information, and label manager can not send the cross-coupled request of setting up to Switch Controller yet;
When using alternate channel, label manager at first will utilize reserved resource to carry out label distribution, initiates cross-coupled request to Switch Controller then, removes other alternate channel of sharing with it simultaneously, and the notice explorer upgrades relevant information;
When other alternate channel of sharing is removed, can trigger the process of setting up of corresponding alternate channel, for setting up new alternate channel in other main thoroughfare.
5. according to the method for claim 4, it is characterized in that:
The process that alternate channel is removed only is that the notice explorer upgrades corresponding resource information.
6. according to the method for one of claim 1 to 5, it is characterized in that: calculated the alternate channel route in advance, the relevant information of primary, spare passage all is stored in the local node, the process that alternate channel activates does not need to calculate route.
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