CN101222364B - Method for recovering local span mesh network in automatic exchanging optical network - Google Patents
Method for recovering local span mesh network in automatic exchanging optical network Download PDFInfo
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- CN101222364B CN101222364B CN2008100047110A CN200810004711A CN101222364B CN 101222364 B CN101222364 B CN 101222364B CN 2008100047110 A CN2008100047110 A CN 2008100047110A CN 200810004711 A CN200810004711 A CN 200810004711A CN 101222364 B CN101222364 B CN 101222364B
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Abstract
The invention discloses a method of restoring a local span mesh network in an automatic switched optical network, which includes the following steps: when a service fails in a link, a link group of a span where the failure link is located is determined whether an idle link is existed or not, if so, the service is rearranged from the failure link to the idle link in the link group for transmission, and the restoration of the link is completed. The method embodies the flexibility of intelligent optical network protective restoration, has the characteristic of quick restoration without changing the prior linkage path, reestablishes a request by a source node to set up a new linkage when the local mesh network can not be restored, and particularly obviously improves the speed of network restoration when applied in a large scale network. The performance of the mode of local mesh restoration is better than that of the mode of nonlocal mesh restoration.
Description
Technical field
The present invention relates to the ASON field, that be specifically related to is a kind of ASON (ASON, Automatically Switched Optical Network) the local span mesh network recovers (Local Span Mesh Restoration, method LSMR) in.
Background technology
High speed development along with network, the application of optical-fiber network is increasingly extensive, and as the core technology ASON ASON that makes up optical-fiber network of new generation with can be compatible, extendible hardware system is for supporting, advanced person's software systems are incorporated hardware platform, form one and have more retractility, data-centered basic platform, thereby become photosphere a kind of dynamic from a kind of transmission medium of static state, the optical network structure of intelligence, and can directly from the light territory, provide the value-added service of various high speed flexibly, make operator can directly from the light territory, provide professional fast, promote comprehensively and transmit usefulness.
In the prior art, after a certain professional place link breaks down, corresponding node can produce link failure or fault alarm, and warning information is uploaded to source node from signaling, and source node selects deletion to connect or new connection of heavy-route according to connecting the corresponding service attribute more then.
As shown in Figure 1, may further comprise the steps of the network recovery method after service transmission link breaks down in the prior art:
After step 103, source node are received link failure message or fault alarm message, initiate to connect the request of foundation again;
As shown in Figure 2, be the network connection diagram of optical-fiber network in the prior art, wherein, A is a source node, and D is a terminal note, and the route of professional transmission is A-C-D.
As shown in Figure 3, be the schematic diagram of the link restoring method after service transmission link breaks down in the prior art.When transport service place link (professional place link is in the C-D section of striding) breaks down or lost efficacy, the C node upwards is delivered to source node A by signaling with link failure message or the fault alarm message that produces, source node A initiates to connect the request of foundation again, business is re-routed, after terminal note D received request, upstream passing confirmed to reply signaling.Re-routing the professional route in back is A-B-D, and business is carried out transfer of data by new route A-B-D.If the service attribute before recovering is irrevocable formula, after being re-routed, business also needs original connection is discharged.
The characteristics of restoration methods from the above mentioned are that full mesh is recovered, and whole connection will be discharged in case of necessity, by source node the whole nodes that connect in the legacy network are carried out Route Selection successively, may change former access path, and the speed of network recovery are slower.
Summary of the invention
The technical problem to be solved in the present invention provides the method that the local span mesh network recovers in a kind of ASON, improves network recovery speed, increases the flexibility of network recovery.
In order to address the above problem, the invention provides the method that the local span mesh network recovers in a kind of ASON, comprising:
Professional place link breaks down or when losing efficacy, whether has idle link in the link group of the failure judgement link place section of striding, if existence is then transmitted described business from the idle link that faulty link is switched to the described link group, finishes link-recovery.
Further, described link group be in ASON, adopt the link aggregation technology the identical multilink bundling of many attributes between adjacent node together polymerization form.
Further, described professional place link breaks down or when losing efficacy, the adjacent node of the described professional place section of striding by with the described section of striding in another node carry out signaling and consult to judge in the link group at described link place whether have idle link.
Further, the adjacent node of the described professional place section of striding refers to the arbitrary node in the section of striding of described professional place.
Further, there is idle link in judgement in the link group of the described link place section of striding after, the control plane of the adjacent node of the described link place section of striding is revised as the port-mark of signaling in the described business port-mark of described idle link, described adjacent node rebulids new link for described transport service according to the port-mark of described idle link on idle link, described business is transmitted in described new chaining.
Further, if when not having idle link in the link group at described link place, carry out following steps:
The adjacent node of the described transport service place section of striding is delivered to source node by signaling with link failure message or the fault alarm message that produces, and by described adjacent node new routing information database more, the routing iinformation after upgrading is broadcasted to whole network; After described source node is received link failure message or fault alarm message, initiate to connect the request of foundation again to the destination node of business; Route calculating is carried out in the control plane route inquiring data storehouse of described source node, transmits demand signalling downstream; After terminal note is received the described request signaling, set up the data-transmission channel that transmits in the plane; Described business by transmitting, is finished link-recovery along new link road.
Further, when the attribute of described business is irrevocable formula, finish link-recovery after, described fault link is discharged.
In sum; method of the present invention has not only embodied the flexibility that the ASON protection recovers; the characteristics that also possess simultaneously fast quick-recovery; and do not change former access path; and still can initiate request again when netted network recovery can't carry out in this locality, set up new connection, particularly when large-scale optical network is used by source node; significantly improve network recovery speed, local netted network recovery mode is better than the performance of the netted network recovery mode in non-this locality.
Description of drawings
Fig. 1 is the flow chart of link restoring method in the prior art;
Fig. 2 is the network connection diagram of optical-fiber network in the prior art;
Fig. 3 is the schematic diagram of the link restoring method after service transmission link breaks down in the prior art;
Fig. 4 is the flow chart that adopts the link restoring method of LSMR method in the present embodiment;
Fig. 5 is the network connection diagram that adopts the optical-fiber network of LSMR method in the present embodiment;
Fig. 6 is the schematic diagram that adopts the link restoring method of LSMR method after service transmission link breaks down in the present embodiment.
Embodiment
Local span mesh network among the ASON ASON recovers (LSMR) and adopts link aggregation (Link Aggregation) technology that many identical multilink bundlings of attribute between adjacent node are aggregated into a link group together, when link maintenance, link group is released with single Link State Advertisement message, and other nodes in the network are logically seen this link group as a link like this.
Has the connection that the local span mesh network recovers attribute, when professional transmission place link breaks down in the section of striding that disposed link aggregation, the adjacent node of the transport service place section of striding searches out idle link in the link group of inefficacy link place after, with business idle link the link group under faulty link is switched to, directly carry out local recovery in the section of striding at faulty link place, above-mentioned adjacent node does not produce control plane link failure message and sends to source node, source node is not because receive the signaling message that the transport service uplink lost efficacy, think that then the link of this section of striding is normal always, need not to recomputate route again and connect, and reduced simultaneously and recalled the probability that (Crank-back) takes place.If when in the link group of inefficacy link place, can not find idle link, then carry out link-recovery according to the method for prior art.
Compared to existing technology, the restoration methods of LSMR mode has been omitted and " has been discharged original connection " in the prior art and the process of " set up and newly be connected ", and does not change the path of original connection, and link-recovery speed is obviously accelerated.
As shown in Figure 4, adopt the link restoring method of LSMR method may further comprise the steps:
Step 401, link occurs fault or inefficacy in the link group of transport service place;
Step 402, the adjacent node of the transport service place section of striding is learnt this link occurs fault or inefficacy by signaling; Above-mentioned adjacent node by with the section of striding in another node carry out signaling and consult in the link group at faulty link place, to seek whether there is idle link, if, carry out next step, otherwise, forward step 405 to;
The transport service place section of striding comprises two nodes that connect the link of transport service place, and above-mentioned adjacent node is meant arbitrary node of the transport service place section of striding.
After the adjacent node of the transport service place section of striding is learnt this link occurs fault or inefficacy by signaling, produce the transmission plane trouble or failure alarm of this link place port, but can not produce the control plane fault warning, therefore only upgrade and transmit flat topology, do not upgrade the control plane topology, so just can not influence former link and connect.
Transmit the plane and be meant the abstraction that unidirectional or two-way transmission passage is provided for user data in the ASON network, comprise and transmit physical link and a series of signal regeneration, unit of the intersection on road up and down of being used for.Control plane is meant the abstraction of setting up, discharging connection and recover to connect by signaling in fault in the ASON network, comprise a series of control assembly comprising connecting functions such as control, calling control, route control and signaling.
Step 403, the control plane of described adjacent node are revised as the sign of the delivery port in the professional command transmitting delivery port sign of recovering the back new url;
Step 404, described adjacent node is designated business according to the recovery rear port and rebulids new link, and issues intersection information to the transmission plane, sets up the transmission passage that transmits panel data, and business was transmitted along new link after intersection was set up successfully; Flow process finishes;
Step 405, the adjacent node of the transport service place section of striding upwards is delivered to source node by signaling with link failure message or fault alarm message, and by described adjacent node new routing information database more, and the routing iinformation after will upgrading is broadcasted to whole network;
After step 406, source node are received link failure message or fault alarm message, initiate to connect the request of foundation again to destination node;
Step 407, the control plane route inquiring data storehouse of source node are carried out route calculating, reserve local time slot and wavelength resource, set up interconnection so that transmit the plane, and transmit demand signalling downstream;
Step 408 after terminal note is received request, issues intersection information to transmitting the plane, set up the data-transmission channel and the time slot that transmit in the plane and intersect, and upstream passing confirms to reply signaling;
Step 409, source node re-route successfully after receiving and confirming to reply signaling, and by transmitting, flow process finishes business along new link road.
If the service attribute before recovering is irrevocable formula, after being re-routed, business also needs original connection is discharged.
As shown in Figure 5, be the network connection diagram that adopts the optical-fiber network of LSMR method, the route of transport service is A-C-D, and A is a source node, and D is a terminal note.Two links of the C-D section of striding aggregate into a link group by the link aggregation technology, and this link group is issued in network with single Link State Advertisement message.
As shown in Figure 6, be the schematic diagram that adopts the link restoring method of LSMR method after service transmission link breaks down.When the link in the C-D section of the striding link group of transport service place breaks down or lost efficacy, C, D node consult to search out idle link by signaling in link group, C, D node are revised professional command transmitting middle port respectively and are designated the target port sign then, rebulid to connect and issue intersection information to the transmission plane according to the target port sign and finish the recovery of local span mesh network.Concerning the whole network, the Link State of C, the D section of striding is still normal, does not upgrade, and can not spread the message of link failure, so business do not change former route, still transmits along route A-C-D.
According to said method, the present invention has reduced signalling path quantity by the link aggregation technology, because signaling can the loopback source node during link failure, so reduced the probability of happening of Crank-back, shorten the heavy-route time, improved the response performance of professional fast quick-recovery greatly.
The present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art are when making various corresponding changes and distortion according to the present invention, and these change and be out of shape the protection range that all should belong to the appended claim of the present invention accordingly.
Claims (5)
1. the method that the local span mesh network recovers in the ASON is characterized in that, comprising:
In ASON, adopt the link aggregation technology the identical multilink bundling of many attributes between adjacent node together polymerization form link group;
Professional place link breaks down or when losing efficacy, the adjacent node of the described professional place section of striding by with the described section of striding in another node carry out signaling and consult whether to have idle link in the link group of the failure judgement link place section of striding, if exist, then described business is transmitted from the idle link that faulty link is switched to the described link group, directly carry out local recovery, finish link-recovery in the section of striding at faulty link place.
2. the method for claim 1 is characterized in that,
The adjacent node of the described professional place section of striding refers to the arbitrary node in the section of striding of described professional place.
3. method as claimed in claim 2 is characterized in that,
There is idle link in judgement in the link group of the described link place section of striding after, the control plane of the adjacent node of the described link place section of striding is revised as the port-mark of signaling in the described business port-mark of described idle link, described adjacent node rebulids new link for described transport service according to the port-mark of described idle link on idle link, described business is transmitted in described new chaining.
4. as each described method among the claim 1-3, it is characterized in that,
When not depositing idle link in the link group at described link place, carry out following steps:
The adjacent node of the described transport service place section of striding is delivered to source node by signaling with link failure message or the fault alarm message that produces, and by described adjacent node new routing information database more, the routing iinformation after upgrading is broadcasted to whole network;
After described source node is received link failure message or fault alarm message, initiate to connect the request of foundation again to the destination node of business;
Route calculating is carried out in the control plane route inquiring data storehouse of described source node, transmits demand signalling downstream;
Terminal note will be received the described request letter from now on, set up the data-transmission channel that transmits in the plane;
Described business by transmitting, is finished link-recovery along new link road.
5. method as claimed in claim 4 is characterized in that,
When the attribute of described business is irrevocable formula, finish link-recovery after, described fault link is discharged.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100047110A CN101222364B (en) | 2008-01-23 | 2008-01-23 | Method for recovering local span mesh network in automatic exchanging optical network |
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| CN2008100047110A CN101222364B (en) | 2008-01-23 | 2008-01-23 | Method for recovering local span mesh network in automatic exchanging optical network |
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| CN101222364A CN101222364A (en) | 2008-07-16 |
| CN101222364B true CN101222364B (en) | 2010-06-16 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101616344B (en) * | 2009-06-17 | 2012-06-06 | 中兴通讯股份有限公司 | Method and device for protecting service based on automatic exchange optical network |
| CN101783836B (en) * | 2009-11-11 | 2014-04-09 | 中兴通讯股份有限公司 | Monitored link switching device, monitored link switching method and network element |
| CN102136865B (en) * | 2010-08-09 | 2014-04-16 | 华为技术有限公司 | Service recovering method, system and node device |
| CN102136997B (en) * | 2010-08-16 | 2014-12-24 | 华为技术有限公司 | Path state updating method and node |
| CN102468973A (en) * | 2010-11-12 | 2012-05-23 | 中兴通讯股份有限公司 | Alarm control method and device for aggregation link in packet switching network |
| CN102480368B (en) * | 2010-11-22 | 2015-07-22 | 中兴通讯股份有限公司 | Protecting method and system of aggregation link |
| CN102136940B (en) * | 2010-12-31 | 2013-10-09 | 华为技术有限公司 | Network recovery method and device |
| US9025439B2 (en) * | 2012-06-26 | 2015-05-05 | Telefonaktiebolaget L M Ericsson (Publ) | Method and system to enable re-routing for home networks upon connectivity failure |
| CN103581012A (en) * | 2013-10-21 | 2014-02-12 | 华为技术有限公司 | Data transmission method and router |
| CN112994785A (en) * | 2019-12-18 | 2021-06-18 | 中国电信股份有限公司 | Service recovery method and device |
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| CN1494265A (en) * | 2002-10-31 | 2004-05-05 | 深圳市中兴通讯股份有限公司 | Logic multisection environment protective method based on different priority grade |
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| CN1494265A (en) * | 2002-10-31 | 2004-05-05 | 深圳市中兴通讯股份有限公司 | Logic multisection environment protective method based on different priority grade |
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| Bala Rajagopalan等.Signaling for Fast Restoration in Heterogeneous OpticalMesh Networks.Proc.SPIE,VOL.4585,99(2001).2003,1-12. * |
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