CN100466546C - System and method for realizing business protection using LCAS protocol - Google Patents

System and method for realizing business protection using LCAS protocol Download PDF

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Publication number
CN100466546C
CN100466546C CNB2006100726752A CN200610072675A CN100466546C CN 100466546 C CN100466546 C CN 100466546C CN B2006100726752 A CNB2006100726752 A CN B2006100726752A CN 200610072675 A CN200610072675 A CN 200610072675A CN 100466546 C CN100466546 C CN 100466546C
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protection
processing unit
protocol processing
lcas
route
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CN101051931A (en
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刘建国
段瑞
王加莹
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ZTE Corp
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ZTE Corp
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    • H—ELECTRICITY
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Abstract

The system includes multiple source nodes and destination nodes in network. The node includes fault detection unit, process unit for protection rearrangement protocol, cross connection unit, and process unit for LCAS protocol. The method includes steps: (1) in idle time or configuration procedure of network, configuring resources, setting up working channel and protecting channel for source nodes and destination nodes; (2) accomplishing LCAS related protocol process (3) fault detection unit detects faults; (4) the process unit for protection rearrangement protocol instructs the process unit for LCAS protocol and the cross connection unit to adjust path of service to implement service protection. The invention is able to implement service protection based on end to end without need of defining more protocol content and new overhead byte so as to save more energy in procedure of protecting grid network. Futures are: simple implementation, upgrading current network smoothly.

Description

Using LCAS protocol is realized the system and method for service protection
Technical field
The present invention relates to the system and method for service protection in the SDH (Synchronous Digital Hierarchy) transmission network, relate in particular to the system and method for end-to-end service protection in a kind of synchronous digital network.
Background technology
Transmission network is as a kind of transmission network for SDH (Synchronous Digital Hierarchy) (SDH, Synchronous Digital Hierarchy), and the survivability of network is subject to people's attention always.Carried out standardization as far back as nineteen nineties about the SDH protect networks at ITU-T (International Telecommunications Union-telecommunication standardization sector, InternationalTelecommunication Union-Telecommunication Standardization Sector).But still there are a large amount of research institutions and company constantly proposing new SDH network protection method.The up-to-date transmission Netcom of ITU-T is also introducing many new notions with the protection standard of switching, and makes every effort to make about transmitting net and the convenient and science of SDH protect networks.
Tradition SDH guard method G.841 and G.842 comprehensively being described in the standard at ITU-T.The System Framework and the main protection form of existing SDH network protection in above-mentioned two standards, have been provided.They are respectively network protection system and the SDH across a network intercommunication guard method of SDH.The SDH protect networks is divided into trace protection and SNCP in SDH network protection system.
More than the detailed description of two standards classification, the method for SDH multiplexing section trace protection, the SNCP method of transannular has been described simultaneously.But for VC (virtual container, Virtual Container) passage trace and SNCP, these two agreements have only been described 1+1 not with the guard method of agreement.Only provided catalogue for other protections that need agreement to realize such as 1:1.This is to need path overhead that specific definition is used to protect and the interaction protocol that uses corresponding expense because realize protecting by agreement if desired in the process that realizes VC passage trace and SNCP.This is considered to the very also breakneck thing of complexity in the period that above-mentioned two standards are finished.The channel layer expense needs to resolve end to end usually, and inappropriate protocol definition may cause network operation paralysis.The another one factor is that at that time transmission net networking is simple, realizes that at the multiplex section layer protection can satisfy the needs that great majority are used.
Along with going deep into of SDH network application, the SDH networking becomes increasingly complex, and the grid network networking is used in increasing networking.The SDH bandwidth is increasing simultaneously, and is fewer and feweri based on the business of multiplex section layer separately.At this moment, SDH is protected end to end and based on the protection of grid network referred necessary height.Research about this respect is the main contents of present SDH network protection research.New draft standard is these content-defined a lot of frameworks.
But increasing agreement at channel layer is the process of a complexity after all.Current use agreement realizes that channel layer protection still do not see appropriate methods.More people also begins diversion to the network recovery of network recovery, particularly ASON (ASON, Automatic Switched OpticalNetwork) network based on control plane.Hope moves behavior after the Control Network fault by the agreement of control plane.
Although the ASON based on control plane is the inevitable of network development.But the network recovery that is based on control plane need solve the similar problem of passage guarantor association a lot of and based on agreement.Guarantee that the control plane reliability service is not a simple thing.Therefore, the notion of ASON has been suggested for many years, but also has very big distance from commercialization, particularly solve high traffic lower network fault often regular meeting cause the situation of unstable networks to occur.
The experience of summing up path layer network protection/recovery in the past is to find, solution is in the past mostly expected to solve the such complicated problems of network protection/recovery fully in a new protocol and network-wide basis.This must cause in difficulty that New Deal formulates and the agreement running test to overall performance of network.The present invention is by utilizing the LCAS (Link Capacity Adjustment Scheme of present comparative maturity; Link capacity adjustment scheme) the channel layer agreement join protection basic principle of switching realizes protection based on agreement at channel layer; not only omitted in the protection process the brand-new definition of channel layer agreement, guaranteed the path protection process stability of network startup simultaneously based on agreement.
Summary of the invention
The invention provides a kind of using LCAS protocol and realize the system and method for service protection; can more effective realization protect based on the teleservice of agreement; and in the process that realizes the teleservice protection, do not need to define more protocol contents, do not need additionally to define again new overhead byte yet for the reciprocal process of Internet resources configuration.Owing to, can make the SDH network realize the path protection of various ways such as 1:1,1:n based on the realization that the teleservice of agreement is protected.
For solving the problems of the technologies described above; the invention provides a kind of using LCAS protocol and realize the system and method for service protection; system comprises multiple source end node and the place end node in the network; described source end node and place end node comprise fault detection unit; protection turning protocol processing unit; cross-connection unit and LCAS protocol processing unit, wherein:
Described fault detection unit is used for detecting the fault of network equipment, and detected fault message is sent protection turning protocol processing unit;
Described protection turning protocol processing unit is used to set up the service aisle of source end node and place end node and protects passage, according to the requirement distribution resource conservation of fault message and protection turning protocol, disposes described LCAS protocol processing unit;
Described LCAS protocol processing unit is used for finishing the LCAS related protocol according to the resource conservation of the service aisle of setting up, protection passage or distribution and handles, and result is sent to described cross-connection unit;
Described cross-connection unit is used for finishing interconnection according to the result that described LCAS related protocol is handled, and realizes the switch protecting of resource in the protection reversed process.
Described protection turning protocol processing unit can be further used for, and obtains professional bandwidth demand; select to be about to the time slot member of foundation according to demand; by the connection status of cross-connection unit configuration cross over circuit,, set up service aisle for the time slot member who selects disposes path.
Described protection turning protocol processing unit; can be further used for; obtain protected mode and service bandwidth demand; on the node of protection route process, determine the time interval resource that the protection route is used; confirm the protection relation; running protection turning protocol on all nodes of protection route process is set up the protection passage.
Described protection turning protocol processing unit; can be further used for; after receiving the fault message that fault detection unit sends, judge whether according to the protection turning protocol whether the business that needs will works on the route switches on the protection route, need to protect the service disconnection on the route.
Described protection turning protocol processing unit; can be further used for; after receiving the fault message of fault detection unit transmission; judge whether that according to the protection turning protocol needs upgrade route; upgrade route if desired; using the time interval resource on the protection route to select new Virtual Concatenation mode on source end node and the place end node, and notice LCAS protocol processing unit is handled the variation of Virtual Concatenation.
Described LCAS protocol processing unit can be further used for, according to the resource conservation that distributes and the requirement of LCAS agreement; consult the resource that protection connects; carry out and use Virtual Concatenation to change, handle the process that time slot changes, and the notice cross-connection unit is finished the interconnection process.
Described protection turning protocol processing unit can be further used for, finish protection after, report PSE Protection Switch Event.
Using LCAS protocol realizes that the method for service protection may further comprise the steps:
(1) in free time of network or layoutprocedure by protection turning protocol processing unit Resources allocation, set up the service aisle and the protection passage of source end node and place end node, the LCAS protocol processing unit is configured;
(2) according to the service aisle of setting up, protection passage, described LCAS protocol processing unit is finished the LCAS related protocol and is handled;
(3) fault detection unit detection failure, and detected fault message sent to described protection turning protocol processing unit;
(4) described LCAS protocol processing unit of protocol instructions and the cross-connection unit switched according to protection of described protection turning protocol processing unit adjusted professional path, realizes service protection.
Described method may further include:
(5) after protection turning protocol processing unit is finished protection, report PSE Protection Switch Event.
Described step 1 may further include: protection turning protocol processing unit obtains professional bandwidth demand; select to be about to the time slot member of foundation according to demand; by the connection status of cross-connection unit configuration cross over circuit,, set up service aisle for the time slot member who selects disposes path.
Described step 1 may further include: protection turning protocol processing unit obtains protected mode and service bandwidth demand; on the node of protection route process, determine the time interval resource that the protection route is used; confirm the protection relation; running protection turning protocol on all nodes of protection route process is set up the protection passage.
Described step 4 may further include: after protection turning protocol processing unit receives the fault message of fault detection unit transmission; judge whether according to the protection turning protocol whether the business that needs will works on the route switches on the protection route, need to protect the service disconnection on the route.
Described step 4 may further include: after protection turning protocol processing unit receives the fault message of fault detection unit transmission; judge whether that according to the protection turning protocol needs upgrade route; upgrade route if desired; using the time interval resource on the protection route to select new Virtual Concatenation mode on source end node and the place end node, and notice LCAS protocol processing unit is handled the variation of Virtual Concatenation.
Described step 4 may further include: the LCAS protocol processing unit is according to the resource conservation that distributes and the requirement of LCAS agreement; consult the resource that protection connects; carry out and use Virtual Concatenation to change, handle the process that time slot changes, and the notice cross-connection unit is finished the interconnection process.
The present invention can realize not needing to define more protocol contents and new overhead byte based on the protection of the teleservice of agreement, makes in the process of grid network protection to economize on resources more, and the present invention realizes simply, can be in existing network smooth upgrade.
Description of drawings
Fig. 1 is according to the described protection system frame diagram of the embodiment of the invention;
Fig. 2 is according to the described protection system fundamental diagram of the embodiment of the invention;
Fig. 3 is according to the described protection system network diagram of the embodiment of the invention;
Fig. 4 is according to the described guard method flow chart of the embodiment of the invention.
Embodiment
As shown in Figure 1, for according to the described protection system frame diagram of the embodiment of the invention, the service protection system consists of the following components: fault detection unit 101, protection turning protocol processing unit 102, LCAS protocol processing unit 103, cross-connection unit 104.
Wherein said fault detection unit 101 is consistent with traditional SDH equipment fault detecting unit, is used for detecting the fault of network equipment.
Described protection turning protocol processing unit 102 is used for distributing resource conservation in the free time of network or layoutprocedure according to the requirement of protecting turning protocol; set up service aisle and protection passage; and adopt correct mode to dispose LCAS protocol processing unit 103, make LCAS protocol processing unit 103 according to LCAS protocol requirement handling failure the time, reach the target of protection.Protect turning protocol processing unit 102 also to finish some subsequent treatment of protection in addition, for example report the incident of switching.
Described LCAS protocol processing unit 103 is finished the relevant protocol processes of LCAS.Result is used for cross-connection unit 104 carries out the resource switch action.
Described cross-connection unit 104 is used to realize the interconnection action, just protects the change action of resource in the reversed process.
As shown in Figure 2, for according to the described protection system fundamental diagram of the embodiment of the invention, the job step of four parts in fault treating procedure of system of the present invention described:
Step 201, fault detection unit carries out fault detect from SDH signal characteristic judgment device operating state;
Step 202, fault detection unit detect notifies protection turning protocol processing unit after there is fault in equipment (network);
Step 203, protection turning protocol processing unit judges that according to the protection turning protocol which type of alternate routing needs use service implementation is protected, the line correlation of going forward side by side protection turning protocol is handled;
Step 204, protection turning protocol processing unit will notify the LACS protocol processing unit that business is switched to the protection route from original work route;
Step 205, described LCAS protocol processing unit is used for finishing the LCAS related protocol according to the resource conservation that distributes and handles;
Step 206, LCAS protocol processing unit then send cross-connection unit according to the requirement of LCAS agreement self with result;
Step 207, the result that cross-connection unit is handled according to the LCAS related protocol is finished interconnection, realizes the switch protecting of resource in the protection reversed process.
The embodiment of the invention is utilized following prior art: SDH frame forming tech, SDH mapping techniques, SDH interconnection technology, SDH overhead processing technology and LCAS technology.
As shown in Figure 3, for according to the described protection system network diagram of the embodiment of the invention, comprise 10 configuration nodes among the figure by system of the present invention.Be respectively: node A, B, C, D, E, F, G, H, I, J.Give simultaneously a business (professional 1) in the drawings: A → B → H → C, wherein the source end node is the A node, the place end node is the C node; And corresponding protection route: A → G → F → I → C, wherein the source end node is the A node, the place end node is the C node.It is special in professional 1 assignment in the process of assignment business protecting route in embodiments of the present invention.Purpose is professional can the protection through standby protection route when network breaks down.
When node H breaks down in the network, professional 1 will interrupt.This moment, node C will detect the fault of service disconnection.This fault message also can be delivered to node A by the LCAS agreement.Node A also will detect fault message this moment.After node A also detected fault message, fault message will be delivered to the protection of node A and switch processing unit.The protection of node A and node C is switched processing unit and will be known and need replace original work route by the protection route this moment.Notify the LCAS protocol processing unit on it to change the Virtual Concatenation relation so processing unit is switched in the protection of node A and node C, switch thereby realize protecting.
As shown in Figure 4, for according to the described guard method flow chart of the embodiment of the invention, described among the figure by system and method for the present invention and realized service protection: at first carried out the foundation of service channel, then fault detection unit real time monitoring network state.After detecting network and breaking down, start the LCAS protocol processes and realize that protection switches, report result at last.
The step of the embodiment of the invention is as follows:
Step 401 is set up service aisle and protection passage in free time of network or layoutprocedure, specifically be divided into following step again:
The first step is set up service aisle.
1, protection turning protocol processing unit obtains professional bandwidth demand.
2, protection turning protocol processing unit is set up the service aisle virtual cascade group according to demand: select to be about to the time slot member of foundation, by the connection status of cross-connection unit configuration cross over circuit, for these time slots member disposes path.
3, operation LCAS agreement between the node that connects process makes work connect operate as normal.
In second step, set up the protection passage.
1, protection turning protocol processing unit obtains protected mode and service bandwidth demand.
2, on the node of protection route process, realize determining the time interval resource of protection route use.
3, protection turning protocol processing unit is confirmed the protection relation, running protection turning protocol on all nodes of protection route process.
Step 402 is carried out fault detect.
In this stage, the fault detection unit of place end node is judged the alarm status of time slot passage according to the overhead byte of SDH, if there is not fault to produce, then carries out fault detect always, in case detect just notice protection turning protocol processing unit of fault.
Step 403 realizes service protection, specifically is divided into following step again:
The first step after protection turning protocol processing unit detects fault, judges whether that according to agreement needs upgrade route, and this comprises the business on the work route is switched on the protection route, with the actions such as service disconnection on the protection route.
Second step, upgrade route if desired, source end and place end protection turning protocol processing unit use the time interval resource on the protection route to select new Virtual Concatenation mode, and notice LCAS protocol processing unit is handled the variation of Virtual Concatenation.
In the 3rd step, the Virtual Concatenation variation is used and carried out to the LCAS protocol processing unit on the protection routing node according to the resource in the requirement negotiation protection connection of LCAS agreement.
In the 4th step, the notice cross-connection unit is finished the interconnection process in the process that the LCAS protocol processing unit changes according to LCAS protocol requirement processing time slot.
Step 404 reports PSE Protection Switch Event.
The invention described above embodiment has provided and has realized the several method that protection is switched; may there be some differences on the idiographic flow that the present invention handles when turning protocol is protected in concrete utilization; these differences need not paid creative work by those skilled in the art and produce; therefore, system and method for the present invention is equally applicable to these situations.

Claims (14)

1, a kind of using LCAS protocol is realized the system of service protection; comprise multiple source end node and place end node in the network; it is characterized in that; described source end node and place end node comprise fault detection unit; protection turning protocol processing unit; cross-connection unit and LCAS protocol processing unit, wherein:
Described fault detection unit is used for detecting the fault of network equipment, and detected fault message is sent to protection turning protocol processing unit;
Described protection turning protocol processing unit is used to set up the service aisle of source end node and place end node and protects passage, according to the requirement distribution resource conservation of fault message and protection turning protocol, disposes described LCAS protocol processing unit;
Described LCAS protocol processing unit is used for finishing the LCAS related protocol according to the resource conservation of the service aisle of setting up, protection passage or distribution and handles, and result is sent to described cross-connection unit;
Described cross-connection unit is used for finishing interconnection according to the result that described LCAS related protocol is handled, and realizes the switch protecting of resource in the protection reversed process.
2, according to the described system of claim 1; it is characterized in that; described protection turning protocol processing unit; be further used for; obtain professional bandwidth demand, select to be about to the time slot member of foundation according to demand, by the connection status of cross-connection unit configuration cross over circuit; for the time slot member who selects disposes path, set up service aisle.
3, according to the described system of claim 1; it is characterized in that; described protection turning protocol processing unit; be further used for; obtain protected mode and service bandwidth demand, on the node of protection route process, determine the time interval resource that the protection route is used, confirm the protection relation; running protection turning protocol on all nodes of protection route process is set up the protection passage.
4, according to the described system of claim 1; it is characterized in that; described protection turning protocol processing unit; be further used for; after receiving the fault message of fault detection unit transmission; judge whether according to the protection turning protocol whether the business that needs will works on the route switches on the protection route, need to protect the service disconnection on the route.
5, according to the described system of claim 1; it is characterized in that; described protection turning protocol processing unit; be further used for; after receiving the fault message of fault detection unit transmission, judge whether that according to the protection turning protocol needs upgrade route, upgrade route if desired; using the time interval resource on the protection route to select new Virtual Concatenation mode on source end node and the place end node, and notice LCAS protocol processing unit is handled the variation of Virtual Concatenation.
6, according to the described system of claim 1; it is characterized in that; described LCAS protocol processing unit; be further used for; according to the resource conservation that distributes and the requirement of LCAS agreement, consult the resource that protection connects, carry out and use Virtual Concatenation to change; handle the process that time slot changes, and the notice cross-connection unit is finished the interconnection process.
According to the described system of claim 1, it is characterized in that 7, described protection turning protocol processing unit is further used for, report PSE Protection Switch Event after finishing protection.
8, a kind of using LCAS protocol is realized the method for service protection, it is characterized in that, may further comprise the steps:
(1) in free time of network or layoutprocedure by protection turning protocol processing unit Resources allocation, set up the service aisle and the protection passage of source end node and place end node, the LCAS protocol processing unit is configured;
(2) according to the service aisle of setting up, protection passage, described LCAS protocol processing unit is finished the LCAS related protocol and is handled;
(3) fault detection unit detection failure, and detected fault message sent to described protection turning protocol processing unit;
(4) described LCAS protocol processing unit of protocol instructions and the cross-connection unit switched according to protection of described protection turning protocol processing unit adjusted professional path, realizes service protection.
9, described according to Claim 8 method is characterized in that, further comprises:
(5) after protection turning protocol processing unit is finished protection, report PSE Protection Switch Event.
10, described according to Claim 8 method; it is characterized in that; described step 1 further comprises: protection turning protocol processing unit obtains professional bandwidth demand; select to be about to the time slot member of foundation according to demand; connection status by cross-connection unit configuration cross over circuit; for the time slot member who selects disposes path, set up service aisle.
11, described according to Claim 8 method; it is characterized in that; described step 1 further comprises: protection turning protocol processing unit obtains protected mode and service bandwidth demand; on the node of protection route process, determine the time interval resource that the protection route is used; confirm the protection relation; running protection turning protocol on all nodes of protection route process is set up the protection passage.
12, described according to Claim 8 method; it is characterized in that; described step 4 further comprises: after protection turning protocol processing unit receives the fault message of fault detection unit transmission; judge whether according to the protection turning protocol whether the business that needs will works on the route switches on the protection route, need to protect the service disconnection on the route.
13, described according to Claim 8 method; it is characterized in that; described step 4 further comprises: after protection turning protocol processing unit receives the fault message of fault detection unit transmission; judge whether that according to the protection turning protocol needs upgrade route; upgrade route if desired; using the time interval resource on the protection route to select new Virtual Concatenation mode on source end node and the place end node, and notice LCAS protocol processing unit is handled the variation of Virtual Concatenation.
14, described according to Claim 8 method; it is characterized in that; described step 4 further comprises: the LCAS protocol processing unit is according to the resource conservation that distributes and the requirement of LCAS agreement; consult the resource that protection connects; carry out and use Virtual Concatenation to change; handle the process that time slot changes, and the notice cross-connection unit is finished the interconnection process.
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