CN1859157A - Service protective method - Google Patents
Service protective method Download PDFInfo
- Publication number
- CN1859157A CN1859157A CN 200510036205 CN200510036205A CN1859157A CN 1859157 A CN1859157 A CN 1859157A CN 200510036205 CN200510036205 CN 200510036205 CN 200510036205 A CN200510036205 A CN 200510036205A CN 1859157 A CN1859157 A CN 1859157A
- Authority
- CN
- China
- Prior art keywords
- passage
- protection
- service
- protection group
- new
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
The present invention discloses a service protection method, which contains 1, adopting working channel and protection channel protection group mode to service; 2, said protection group according to sharing protection mode recovering relevant interruption channel in channel interruption to form new protection group for service protection. The present invention effectively combines intelligent service 1+1/1:1 protection mechanism and sharing recovery mechanism, thereby capable of quickly effective to continue more sufficient protection to ASON optical network service, ensuring service continuance, having very high applicability to high level service.
Description
Technical field
The present invention relates to ASON (ASON, Automatically Switched OpticalNetwork) technology, relate in particular to the service protecting method among a kind of ASON.
Background technology
ASON is the optical transfer network of new generation that can intelligently finish optical-fiber network exchange linkage function automatically, it is on the basis of the automatic discovery of Internet resources and topological structure, call dynamic and intelligent routing algorithm, handle and alternately, set up automatic as required end to end exchange and connect by distributed signaling.
In order to finish above-mentioned automatic exchange linkage function, ASON must possess some basic functions, comprises discovery feature (as neighbours' discovery, Topology Discovery, service discovering etc.), routing function, signaling capability etc.
The professional connection by above-mentioned automatic exchange transmits in an ASON network.In network, business there is the kinds of protect mode; specifically comprise 1+1 protection, 1:1 protection, share protect; wherein 1+1 protection adopts the mode of dual transmitting and receiving; when the teleservice of setting up between 2; set up the two strip label switching paths (LSP, Label Switch Path) of service aisle and protection passage simultaneously, when service aisle LSP breaks down; switch to fast on the LSP of protection passage, make business obtain fast quick-recovery.
When this kind mode breaks down when the protection passage, because service operation is therefore professional unaffected on service aisle.When service aisle broke down, business automatically switched to the protection passage, and business is protected fast.When faulty channel recovers, the requirement when setting up according to business, business can be selected to return to service aisle and still keep present situation constant.
But under this protected mode, if under the situation that service aisle interrupts, the protection passage also interrupts this moment, and just do not have the path to send and to receive professional this moment.
In addition; the mode of resource reservation is adopted in protection for 1:1; the same with 1+1 protection; set up service aisle and two LSP of protection passage when adopting this mode to set up teleservice simultaneously; but have only service aisle LSP to go up bearer service, protection passage LSP reserves, when service aisle LSP breaks down; business switches on the protection passage LSP again, and business is restored.This kind mode is owing to need to reserve the resource of protection passage LSP, and resource requirement is more.
The share protect mode then belongs to a kind of protected mode that the whole network is shared; under this mode, when setting up teleservice, set up the LSP of a job, when this LSP breaks down; initiate to rebulid a new LSP by the source end and make business recovery; finish protection, but under this mode, the business recovery time is long to business; and only set up a new passage; when passage broke down once more, it was slow to carry out professional recovery, is not suitable for business-level than higher business.
To sum up, progressively increase recovery time professional in above-mentioned three kinds of service protection modes, is respectively 1+1 protection＜1:1 protection＜share protect.And, when service aisle LSP and protection passage LSP break down, professionally just interrupt fully for the protected mode of 1+1 and 1:1.
Summary of the invention
The technical problem that the present invention solves provides a kind of service protecting method; with under the effective situation of Internet resources; keep the two passes of 1+1 or 1:1 service protection group to form the protected mode of work and protection all the time, thereby the protection mechanism fast and effectively to the business in the ASON is provided.
For addressing the above problem, service protecting method of the present invention comprises:
A, business adopted the protected mode of service aisle and protection channel protection group;
Recover the passage of respective interrupt when passage interrupts in b, the described protection group according to the share protect mode, form new protection group and carry out service protection.
Wherein, service aisle interrupts in the described protection group, and step b comprises:
Business is switched to the protection passage, make the protection passage as new service aisle;
Recover the service aisle of described interruption according to the share protect mode, and, set up new protection group with described new service aisle and carry out service protection as new protection passage.
Wherein, the protection passage interrupts in the described protection group, and step b comprises:
Recover described protection passage according to the share protect mode, and set up new protection group with service aisle and carry out service protection.
Wherein, a described protection group passage wherein interrupts, and another passage does not interrupt yet before this passage also begins to recover, and step b comprises:
Initiate to set up the protection group of service aisle and protection passage according to the share protect mode, and be set to new protection group and carry out service protection.
Wherein, a described protection group passage wherein interrupts, and another passage also interrupts when this passage is recovering, and step b comprises:
Before wherein a passage is generating new recovery passage according to the share protect mode; forbid the newly-built recovery of an other passage; after treating that last passage finished recovery according to the share protect mode; start another passage of reconstruction according to the share protect mode, two passes is set to new protection group and carries out service protection.
Wherein, a described protection group passage wherein interrupts, and also interrupts at this another passage of routing restoration failure back, and step b comprises:
Rebulid service aisle and protection passage immediately according to the share protect mode, and be set to new protection group and carry out service protection.
Wherein, a passage in the described protection group interrupts, and step b comprises:
In this passage, have no progeny this passage is recovered according to the share protect mode,, initiate the recovery of this passage after waiting for a period of time once more, up to this routing restoration if recover this passage failure.
Wherein, described protection group can adopt the 1+1 protection mode.
Wherein, described protection group can adopt the 1:1 protected mode.
Compared with prior art, the present invention has the following advantages:
The present invention adopts the protected mode of service aisle and protection channel protection group to business, and the passage that according to share protect mode recovers respective interrupt when having passage to interrupt in described protection group carries out service protection.The 1+1/1:1 protection mechanism of effective fusion IN service and shared Restoration Mechanism; thereby in effective network source, can protect more fully the ASON optical network service fast and effectively; guaranteed professional continuity, very high applicability has been arranged for the high business of business-level.
Description of drawings
Fig. 1 is the principle schematic of prior art share protect mode;
Fig. 2 is a kind of ASON network diagram that the specific embodiment of the invention is used;
Fig. 3 is the schematic diagram that carries out the 1+1/1:1 protection in the network shown in Figure 2;
Fig. 4 is the schematic diagram that the 1+1/1:1 protection is switched;
Fig. 5 is the end-to-end recovery schematic diagram of having no progeny in the service aisle of the present invention;
Fig. 6 is that the present invention protects the end-to-end recovery schematic diagram of having no progeny in the passage.
Embodiment
The present invention can be applied in single ASON network domains; also can be applied in the network environment of a plurality of ASON network domains; its core is to realize professional reliably protecting by the 1+1/1:1 protection of ASON and the fusion of the shared protection mechanism of recovering; also promptly business is adopted the 1+1/1:1 protected mode of service aisle and protection channel protection group; when interrupting, recovers in the passage of described 1+1/1:1 protected mode the passage of respective interrupt according to the share protect mode; form new 1+1/1:1 protection group and carry out service protection; thereby realize the protection mechanism of the permanent 1+1/1:1 business of IN service; fast and effectively optical network service is protected and is recovered, below specific embodiment describe.
At first the principle that the share protect of the present invention's application is recovered describes.
Share protect belongs to a kind of protected mode that the whole network is shared; under this mode, when setting up teleservice, set up a LSP, when certain bar link breaks down among this LSP; by the node notification source node that detects fault, initiate to rebulid a new LSP by the source end and make business recovery.As shown in Figure 1, set up the connection of a share protect mode from node A to node G in the drawings, access path is A-F-G.When the F-G link breaks down, the F node detection is to this link failure, the F node sends Notify message (if through intermediate node by the RSVP signaling protocol to the first node A that connects, directly transmit this Notify message to the first node that connects), after first node A receives Notify message, initiate new establishment of connection, establishment step is as follows:
1, get rid of the link break down, to the routing information of routing module inquiry from the A node to the G node, routing module is through the route computational algorithm, obtain the optimal path from A to G after, return to signalling module.As shown in Figure 1, the routing module path of calculating is A-D-E-G.
2, after signalling module obtains routing information that route returns, send Path message to next node, and reserved resource;
3, after downstream node receives the Path message of upstream node transmission, carry out respective handling, continue to send Path message to downstream node, and reserved resource, up to destination node;
4, after destination node receives Path message, handle upstream nodes loopback Resv message accordingly;
5, after upstream node receives Resv message, carry out continuing upstream to send Resv message after the resource connection processing, receive Resv message up to first node, so far the protection process of share protect mode is finished.
When the present invention is interrupted for the service aisle of 1+1/1:1 mode and/or protection passage, can carry out the recovery of respective interrupt passage by above-mentioned sharing mode, thereby guarantee that the two passes of 1+1/1:1 service protection group forms the protected mode of work and protection all the time.
With reference to figure 2, this figure is a kind of network environment schematic diagram of 1+1/1:1 protection.
As shown, at the ASON of these 7 nodes network, adopt the 1+1/1:1 protected mode to set up an intelligent teleservice from node A to node G, the 1+1/1:1 business after the mode that adopts node to separate is set up as shown in Figure 3.Service aisle LSP is by A-F-G in the protection group of service protection, and protection passage LSP is A-B-C-G.
For 1+1 service protection mode; adopt the mode of dual transmitting and receiving to carry out professional transmission and reception at node A and G; in Fig. 3; what solid line was represented is exactly professional true transmission and reception condition; dotted line is represented professional mode of carrying out selective reception at node G; set up the subnet protection group of A-B and A-F and C-G and F-G respectively at source end A and place end G, in Fig. 3, selection to be that the solid line direction receives professional.
For 1:1 service protection mode, service aisle LSP is A-F-G, and protection passage LSP is A-B-C-G, and is professional by service aisle LSP transmission, and protection passage LSP is transport service not.
According to normal ASON network 1+1 protection mechanism, when service aisle LSP broke down, professional transmitting terminal did not need to carry out the professional change action that sends, and carried out the professional switching that receives at professional receiving terminal and had just finished protection to the fault business.
And for ASON network 1:1 protection mechanism, when service aisle A-F-G broke down, professional source end and destination need switch to business on the protection passage A-B-C-G from service aisle by protocol negotiation.By protecting the back business as shown in Figure 4.If but breaking down once more on the service link this moment, node A has just interrupted to the business of node G so.
In this case,, can adopt the 1+1/1:1 of ASON and share the combination that recovers two kinds of protection Restoration Mechanism, form the guard method of permanent 1+1/1:1 according to protected mode of the present invention.
When specific implementation of the present invention, can timer T1 overtime as starting the trigger condition that the passage that interrupts recovers, the trigger condition that the overtime passage continuation of interrupting as routing restoration failure back startup of timer T2 recovers is described in detail with the different situation of branch shown in Figure 3 below.
Service aisle interrupts in the protection group
Situation for service aisle interrupts at first switches to business the protection passage, makes the protection passage as new service aisle; Then with the service aisle that interrupts as new protection passage, and recover the service aisle of described interruption according to the share protect mode, set up new protection with described new service aisle and consist of 1+1/1:1 protection group and carry out service protection.
During specific implementation, have no progeny in service aisle, professional receiving terminal can carry out the professional switching that receives automatically, finishes the protection to the fault business, and protection back business as shown in Figure 4.
Interrupt owing to service aisle simultaneously; business switches to original protection passage; in order at any time to form permanent 1+1/1:1 protection to business; need to adopt the mode of sharing recovery that service aisle is recovered; promptly having no progeny in service aisle, (timer T1 is overtime) initiates to rebulid a new LSP at the service source end behind the certain hour; original service aisle is recovered; delete old subnet protection service groups; in the source; the place end is set up new subnet protection group; as new LSP is A-D-E-G; at source end deletion A-B; the subnet protection group of A-F is set up A-B; the subnet protection group of A-D is at deleting termination sinks C-G; the subnet protection group of F-G; set up C-G; the subnet protection group of E-G, at this moment, original protection passage A-B-C-G becomes service aisle; newly-established service channel A-D-E-G is set to the protection passage of new service aisle, by the teleservice after the permanent 1+1/1:1 protection as shown in Figure 5.
If service aisle originally can not in time be restored, can initiate to set up new LSP again by timing (timer T2) and attempt recovering.
The protection passage interrupts in the protection group
Situation about interrupting for protection passage the present invention can recover described protection passage according to the share protect mode, and sets up new protection with service aisle and consist of 1+1/1:1 protection group and carry out service protection.
During specific implementation; in the protection passage, have no progeny; business is still on service aisle; professional unaffected; professional receiving terminal can not carry out the professional switching that receives; but in order at any time to form permanent 1+1/1:1 protection to business; need to adopt the mode of sharing recovery that the protection passage is recovered, (timer T1 is overtime) can initiate to set up a new LSP too at the service source end behind the certain hour of promptly having no progeny in the protection passage, and the protection passage is recovered; delete old service protection group; for example, for the 1+1 mode, new LSP is A-D-E-G; at source end deletion A-B; the subnet protection group of A-F is set up A-B; the subnet protection group of A-D is at deleting termination sinks C-G; the subnet protection group of F-G; set up F-G, the subnet protection group of E-G.At this moment, original service aisle A-B-C-G remains unchanged, and newly-established A-D-E-G is set to protect passage, by the teleservice after the permanent 1+1/1:1 protection as shown in Figure 6.
If protection passage originally can not in time be restored, can initiate to set up new LSP again by timing (timer T2) and attempt recovering.
Need to prove, above-mentioned for a passage interruption in the 1+1/1:1 protection group, in this passage, to have no progeny and recover this passage failure, the back of then can waiting for a period of time (for example overtime back of timer T2) initiates the recovery of this passage once more, up to this routing restoration.
The situation of working and protecting passage all to interrupt in the protection group for the 1+1/1:1 protected mode
This situation occurs in when a passage interrupts, and when an other passage also interrupts, for this situation, multiple possible scene is arranged, for example:
A, a passage interrupt, and another passage does not interrupt yet before this passage also begins to recover;
B, a passage interrupt, and another passage also interrupts when this passage is recovering;
C, a passage interrupt, and also interrupt at this another passage of routing restoration failure back;
For situation A, when two passes all interrupts, stop the timer T1 of current routing restoration, initiate rebuliding of 1+1/1:1 work and protection passage immediately according to the share protect mode, and be set to new protection group formation 1+1/1:1 protection.
For situation B, before wherein a passage is generating new recovery passage according to the share protect mode, forbid the newly-built recovery of an other passage, after treating that last passage finished recovery according to the share protect mode, also start and rebuild another passage according to the share protect mode, two passes is set to new subnet protection group, and forms the 1+1/1:1 protection;
For situation C, a routing restoration failure when an other passage also interrupts, rebulids 1+1/1:1 protected mode service aisle and protection passage immediately according to the share protect mode, and is set to new protection group formation 1+1/1:1 protection.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (9)
1, a kind of service protecting method is applied to it is characterized in that in the ASON, comprising:
A, business adopted the protected mode of service aisle and protection channel protection group;
Recover the passage of respective interrupt when passage interrupts in b, the described protection group according to the share protect mode, form new protection group and carry out service protection.
2, service protecting method according to claim 1 is characterized in that, service aisle interrupts in the described protection group, and step b comprises:
Business is switched to the protection passage, make the protection passage as new service aisle;
Recover the service aisle of described interruption according to the share protect mode, and, set up new protection group with described new service aisle and carry out service protection as new protection passage.
3, service protecting method according to claim 1 is characterized in that, the protection passage interrupts in the described protection group, and step b comprises:
Recover described protection passage according to the share protect mode, and set up new protection group with service aisle and carry out service protection.
4, service protecting method according to claim 1 is characterized in that, a described protection group passage wherein interrupts, and another passage does not interrupt yet before this passage also begins to recover, and step b comprises:
Initiate to set up the protection group of service aisle and protection passage according to the share protect mode, and be set to new protection group and carry out service protection.
5, service protecting method according to claim 1 is characterized in that, a described protection group passage wherein interrupts, and another passage also interrupts when this passage is recovering, and step b comprises:
Before wherein a passage is generating new recovery passage according to the share protect mode; forbid the newly-built recovery of an other passage; after treating that last passage finished recovery according to the share protect mode; start another passage of reconstruction according to the share protect mode, two passes is set to new protection group and carries out service protection.
6, service protecting method according to claim 1 is characterized in that, a described protection group passage wherein interrupts, and also interrupts at this another passage of routing restoration failure back, and step b comprises:
Rebulid service aisle and protection passage immediately according to the share protect mode, and be set to new protection group and carry out service protection.
7, service protecting method according to claim 1 is characterized in that, a passage in the described protection group interrupts, and step b comprises:
In this passage, have no progeny this passage is recovered according to the share protect mode,, initiate the recovery of this passage after waiting for a period of time once more, up to this routing restoration if recover this passage failure.
According to each described service protecting method of claim 1-7, it is characterized in that 8, described protection group adopts the 1+1 protection mode.
According to each described service protecting method of claim 1-7, it is characterized in that 9, described protection group adopts 1: 1 protected mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100362056A CN100372305C (en) | 2005-07-28 | 2005-07-28 | Service protective method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100362056A CN100372305C (en) | 2005-07-28 | 2005-07-28 | Service protective method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1859157A true CN1859157A (en) | 2006-11-08 |
| CN100372305C CN100372305C (en) | 2008-02-27 |
Family
ID=37298024
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100362056A Expired - Fee Related CN100372305C (en) | 2005-07-28 | 2005-07-28 | Service protective method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100372305C (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101834710A (en) * | 2010-04-30 | 2010-09-15 | 中兴通讯股份有限公司 | Method and system for controlling protection switching in plane protection group of automatic switch optical network (ASON) |
| WO2010148599A1 (en) * | 2009-06-26 | 2010-12-29 | 中兴通讯股份有限公司 | Protection system, method and apparatus for optical network |
| CN101656572B (en) * | 2009-09-02 | 2012-07-25 | 烽火通信科技股份有限公司 | Method for realizing permanent shared restoration in ASON network |
| WO2012106976A1 (en) * | 2011-02-09 | 2012-08-16 | 华为技术有限公司 | Fault protection method and device |
| CN101656897B (en) * | 2009-08-31 | 2013-01-02 | 东北大学 | Method for grooming multilayer multi-granularity traffic in waveband switching optical network |
| CN101656896B (en) * | 2009-08-31 | 2013-02-13 | 东北大学 | Method for grooming dynamic multi-granularity traffic in reconfigurable heterogeneous waveband switching optical network |
| CN101345590B (en) * | 2008-08-22 | 2013-08-07 | 中兴通讯股份有限公司 | SNCP business collocation method |
| CN112019261A (en) * | 2019-05-31 | 2020-12-01 | 烽火通信科技股份有限公司 | Method and system for returning distributed control plane electrical layer 1+1 service |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7406033B2 (en) * | 2002-02-28 | 2008-07-29 | Nortel Networks Limited | Methods, devices and software for combining protection paths across a communications network |
| CN1151615C (en) * | 2002-06-07 | 2004-05-26 | 清华大学 | Optical path establishing method for automatically exchanging optical network |
| CN1306734C (en) * | 2003-03-04 | 2007-03-21 | 华为技术有限公司 | Service link protecting method for intelligent optical network |
-
2005
- 2005-07-28 CN CNB2005100362056A patent/CN100372305C/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101345590B (en) * | 2008-08-22 | 2013-08-07 | 中兴通讯股份有限公司 | SNCP business collocation method |
| WO2010148599A1 (en) * | 2009-06-26 | 2010-12-29 | 中兴通讯股份有限公司 | Protection system, method and apparatus for optical network |
| CN101605282B (en) * | 2009-06-26 | 2012-07-04 | 中兴通讯股份有限公司 | System, method and device for protecting optical network |
| US9008500B2 (en) | 2009-06-26 | 2015-04-14 | Zte Corporation | Protection system, method and apparatus for optical network |
| CN101656897B (en) * | 2009-08-31 | 2013-01-02 | 东北大学 | Method for grooming multilayer multi-granularity traffic in waveband switching optical network |
| CN101656896B (en) * | 2009-08-31 | 2013-02-13 | 东北大学 | Method for grooming dynamic multi-granularity traffic in reconfigurable heterogeneous waveband switching optical network |
| CN101656572B (en) * | 2009-09-02 | 2012-07-25 | 烽火通信科技股份有限公司 | Method for realizing permanent shared restoration in ASON network |
| CN101834710A (en) * | 2010-04-30 | 2010-09-15 | 中兴通讯股份有限公司 | Method and system for controlling protection switching in plane protection group of automatic switch optical network (ASON) |
| CN101834710B (en) * | 2010-04-30 | 2014-02-05 | 中兴通讯股份有限公司 | Method and system for controlling protection switching in plane protection group of automatic switch optical network (ASON) |
| WO2012106976A1 (en) * | 2011-02-09 | 2012-08-16 | 华为技术有限公司 | Fault protection method and device |
| CN112019261A (en) * | 2019-05-31 | 2020-12-01 | 烽火通信科技股份有限公司 | Method and system for returning distributed control plane electrical layer 1+1 service |
| CN112019261B (en) * | 2019-05-31 | 2022-02-08 | 烽火通信科技股份有限公司 | Method and system for returning distributed control plane electrical layer 1+1 service |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100372305C (en) | 2008-02-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1859157A (en) | Service protective method | |
| CN1244212C (en) | Implicit shared bandwidth protection for fast reroute | |
| CN1866806A (en) | Method for realizing shared grid network recovery | |
| US8422361B2 (en) | Management of protection path bandwidth and changing of path bandwidth | |
| CN101030939A (en) | Method and apparatus for establishing and restoring label exchange path in automatic-exchange optical network | |
| WO2006025296A1 (en) | Failure recovery method, network device, and program | |
| CN1496629A (en) | Load balancing for fast reroute backup tunnels | |
| CN101047440A (en) | Method of service route return | |
| CN101035019A (en) | Fast convergence method and device of the end-to-end service | |
| CN1874285A (en) | Method and equipment for implementing broadcast or multicast on elastic packet ring | |
| CN1812401A (en) | Method for establishing return tag exchange route in multiprotocol tag exchange system | |
| CN1864142A (en) | Transparent re-routing of MPLS traffic engineering LSPs within a link bundle | |
| CN1859260A (en) | Resource distributing method while traditional optical transfer net and intelligent optical network grouping | |
| CN101547155A (en) | Master and standby tunnel load sharing method and flow forwarding equipment | |
| CN1505409A (en) | Rerouting method based on network entrance node | |
| CN1780253A (en) | Method for repeating route rapidly | |
| CN1859431A (en) | Method for realizing two-way marked exchange path | |
| CN101150878A (en) | Parallel signaling method for realizing quick optical channel connection in intelligent optical network | |
| CN1933423A (en) | Recovery method and apparatus for optical network LSP occuring abnormal delete | |
| CN1499747A (en) | Method for implementing protection and restoration for intelligent optical network | |
| CN1842034A (en) | Multi protocol label exchange performance supervision ability notifying and arranging method | |
| CN1674527A (en) | Method for enhancing survivability of automatic exchange optical network | |
| CN1812360A (en) | Intelligent optical network business re-routing trigging method | |
| CN101938309B (en) | Network code-based WDM network sectionalized protection method | |
| CN1798051A (en) | Method of network fault recovery crossing over connections in multiple domains |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080227 Termination date: 20150728 |
|
| EXPY | Termination of patent right or utility model |