CN102045230A - Ethernet link protection switching method and device - Google Patents
Ethernet link protection switching method and device Download PDFInfo
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
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Abstract
The invention discloses an Ethernet link protection switching method and device, relating to the technical field of the network. The invention is used for solving the problems that faults represented in a non off-line mode, of a physical port in the Ethernet can not be detected, and the fault detection time is too long. The method comprises: in the detection process, a maintenance association edge point (MEP) node in maintenance association (MA) sends a CCM (continuity check message) protocol message to an opposite terminal MEP node; when the opposite terminal MEP node does not receive the CCM protocol message within the preset wait time, a warning message is sent to a main node of the Ethernet protection domain thereof; and when the main node receives the warning message, the link protection switching operation is carried out on the Ethernet in which the main node is positioned. Thus, the invention can detect faults represented in non off-line mode, of the physical port in the Ethernet, and the time for detecting faults can be shortened.
Description
Technical field
The present invention relates to networking technology area, relate in particular to a kind of method and device of ethernet ring network link protection change.
Background technology
Along with the continuous development of ethernet ring network technology, the scale of ethernet ring network network is also increasing.At present, carrier class ethernet ring network circuit has obtained extensive use, and therefore, just seeming for the protection of ethernet ring network link is even more important.
In the prior art; in the system of Ethernet ring protection link; by a plurality of Ethernet ring protection territory is set for ethernet ring network, professional VLAN (Virtual Local Area Network, the VLAN) function based on the user data service forwarding can be realized in each Ethernet ring protection territory.As shown in Figure 1, operating personnel's node in the ethernet ring network according to the actual requirements are set to host node or from node, and each Ethernet ring protection territory is usually by a host node and one or morely form jointly from node; Each node is made up of two ports; described two ports comprise master port and from port; each port is connected with other nodes respectively so that form loop in the Ethernet ring protection territory; host node is changed to himself invalidly to avoid occurring network storm when starting working from the ports physical forwarding capability, makes master port place link physical forwarding capability be changed to effective status simultaneously.When certain section link in being checked through the Ethernet ring protection territory breaks down; host node will be changed to from the physics forwarding capability of port effectively; promptly make and start working, finish the link protection change operation, guarantee the normal forwarding of data service with this from port place link.
For carrier class ethernet ring network network; promptly protect switching operation in order to guarantee user's perception less than the switching action of link; therefore, the time of the ethernet ring network cutout just time of protection switching operation must be controlled in the 50ms, could satisfy network reliability and stability requirement.Generally speaking, the time of protection switching operation mainly is made up of two parts: fault takes place to detected T1 detection time of fault; The protection switching operation begins to switch the switching time T2 that comes into force to protection.Wherein, detection time, T1 was bigger because of testing mechanism difference difference, and protection switch time T2 is relatively fixing.Therefore; detection time, the length of T1 directly determined whether can reach the protection switching operation of ethernet ring network the performance requirement of 50ms, and can employed detection method fast, effectively be implemented to detect the speed that has directly determined the protection switching operation and normally carry out.
Inspection method at present commonly used is to check that directly ring goes up the physical state of the physical port of each node, determines whether that according to check result needs protect switching operation then.But the inventor finds this method and has following defective:
1, the fault for linear formula performance below the physical port is effective, but can't not detect with the fault of this form performance for other;
2, in the prior art, check that directly the physical state of encircling the physical port of going up each node will expend a large amount of detection times, thereby cause protecting the overlong time of switching operation.
Summary of the invention
The embodiment of the invention provides a kind of method of ethernet ring network link protection change, is used for solving the problem of the overlong time that can't detect fault that the ethernet ring network physical port shows with the non-form of rolling off the production line and fault detect.
A kind of method of ethernet ring network link protection change, this method comprises:
In testing process, safeguard and safeguard among the associating MA that associating marginal point MEP node sends CCM message protocol information to opposite end MEP node;
When described opposite end MEP node did not receive this CCM message protocol information in the predefined stand-by period, the host node to himself Ethernet ring protection territory, place sent warning information;
Described host node carries out the link protection change operation to the ethernet ring network at this host node place when receiving warning information.
A kind of device of ethernet ring network link protection change, this device comprises:
Sending module is used in testing process, safeguards and safeguards among the associating MA that associating marginal point MEP node sends CCM message protocol information to opposite end MEP node;
The alarm sending module, when being used for described opposite end MEP node not receiving this CCM message protocol information in the predefined stand-by period, the host node to himself Ethernet ring protection territory, place sends warning information; Described too looped network protection territory comprises the host node of ethernet ring network;
Switch module, be used for described host node when receiving warning information, the ethernet ring network at this host node place is carried out the link protection change operation.
By adopting method provided by the invention, in testing process, whether receive the CCM message information that opposite end MEP node is sent by confirming the MEP node among the MA, can determine fast whether this MEP node place link breaks down; When determining to break down, this MEP node gives a warning to the host node in its Ethernet ring protection territory, place, after host node is received warning information, the ethernet ring network at this host node place is carried out the link protection change operation, guarantee that with this ethernet ring network can be in normal operating conditions; As seen, adopt the present invention, can detect the fault that physical port shows with the non-form of rolling off the production line in the ethernet ring network, and can reduce the time of fault detect.
Description of drawings
Fig. 1 is the structural representation in ethernet ring network and Ethernet ring protection territory in the prior art;
The method flow schematic diagram of a kind of ethernet ring network link protection change that Fig. 2 provides for the embodiment of the invention;
The MA domain structure schematic diagram that Fig. 3 provides for the bright embodiment of this law;
A kind of ethernet ring network that Fig. 4 provides for embodiment one and the structural representation in Ethernet ring protection territory;
A kind of ethernet ring network of transparent transmission equipment and structural representation in Ethernet ring protection territory of having that Fig. 5 provides for embodiment two;
Fig. 6 has the ethernet ring network of a plurality of transparent transmission equipment and the structural representation in Ethernet ring protection territory;
The apparatus structure schematic diagram of a kind of ethernet ring network link protection change that Fig. 7 provides for the embodiment of the invention.
Embodiment
The embodiment of the invention provides a kind of method of ethernet ring network link protection change; this method is passed through the IEEE802.1ag protocol application in the link detecting mechanism of ethernet ring network; trigger the Ethernet ring protection switching operation by this detection protocol, thereby detect the link that breaks down in the ethernet ring network and protect and switch.Described IEEE 802.1ag is also referred to as and connects fault management (Connectivity Fault Management, CFM), be in order to satisfy the standard that is used for the operation of carrier class ethernet ring network, administers and maintains that fast-developing metropolitan area Access Network proposes the network performance needs.As shown in Figure 2, concrete steps are as follows:
In step 11, in testing process, safeguard and safeguard among the associating MA that associating marginal point MEP node comprises that to the method that opposite end MEP node sends CCM message protocol information the MEP node sends CCM message protocol information every predefined transmitting time to opposite end MEP node; Described transmitting time specifically can be that CCM agreement regulation message sends cycle 3.3ms; Comprise two or more MEP nodes among the described maintenance associating MA;
In step 12, when opposite end MEP node did not receive this CCM message protocol information in the predefined stand-by period, method from warning information to the host node in himself Ethernet ring protection territory, place that send comprised multiple, and preferred methods is:
When opposite end MEP node does not receive this CCM message protocol information in the predefined stand-by period, this opposite end MEP node is according to predefined contingency table, in described contingency table, search the positional information of host node in the Ethernet ring protection territory at self place, and send warning information to this host node according to this positional information; The described stand-by period is for sending the multiple of CCM message protocol information required time; Concrete, can be that 3 times of message transmission cycle required time are 9.9ms, therefore after waiting for 9.9ms, the MEP node finds not receive CCM message protocol information, just send warning information, therefore shortened the time of fault detect greatly;
In step 13, host node carries out the link protection change method of operating to the described ethernet ring network at this host node place and is specially when receiving warning information:
When described host node when receiving warning information, this host node is switched another link into the ethernet ring network at self place; Host node is changed to its physics forwarding capability from port effectively in this step, promptly makes and starts working from port place link, can guarantee that each node in the ethernet ring network still can proper communication.
Below be introduced with specific embodiment:
Embodiment provided by the invention be the most basic continuity of having used CFM detect (Continuity Check, CC) function, and by CFM for this ethernet ring network divide a plurality of management domains (Maintenance Domains, MD); And in MD one safeguard associating (Maitenance Associations be respectively master and slave node in MA) and be provided with and safeguard associating marginal point (MEP) or maintenance associating intermediate point (MIP), as shown in Figure 3; Master and slave node is non-transparent transmission equipment in ethernet ring network, and transparent transmission equipment does not need to be provided with.The MEP node is necessary for host node or from node, and comprises two MEP nodes in same MA at least; The MIP node can be transparent transmission equipment, can comprise 0 or a plurality of MIP node in same MA.
Embodiment one:
The embodiment of the invention one provides a kind of method of ethernet ring network link protection change; whether this method can receive CCM message protocol (the Continuity Check Message that opposite end MEP node sends according to the MEP node that is provided with; CCM) information; determine that two links between the MEP node whether can proper communication; if could not this link occurs fault would be described, therefore carry out link protection change.Introduce for convenience, present embodiment to be being provided with a MD referring to ethernet ring network shown in Figure 1, and only to comprise a MA among this MD be that example describes, and thinks that all nodes in this ethernet ring network all are used for the support information function of exchange, non-transparent transmission equipment.As shown in Figure 4, detailed process is as follows:
Step 21 is for ethernet ring network is created the Ethernet ring protection territory; Comprise node S1, S2, S3, S4 in this Ethernet ring protection territory;
Step 22, operating personnel's node in the ethernet ring network as required are set to a host node and a plurality of from node;
The host node node of paying close attention to of attaching most importance to is S1 in this step,, can not be provided with for the node that does not need to pay close attention to for the node of time paying close attention to is S2, S3, S4 from node;
Owing to have only an Ethernet ring protection territory, therefore, a host node can only be set in this ethernet ring network in this step; For the ethernet ring network that more nodes are arranged as long as only comprise a host node in the Ethernet ring protection territory that guarantees to be created, referring to Fig. 1;
Step 23, operating personnel with the host node in Ethernet ring protection territory from port, promptly the physics forwarding capability of the link that links to each other with S4 from port of S1 be changed to invalid;
It is that network wind to occur in order to prevent from the Ethernet ring protection territory to transmit information quick-fried that the physics forwarding capability of the link that in this step S1 is linked to each other with S4 is changed to invalid;
Step 24, operating personnel are the forging link establishment MA between the S2 to S3 in the ethernet ring network, and determine the MEP node in MA; This step comprises following content:
Step 31 determines that the ID of node in the ethernet ring network identifies;
Step 32, operating personnel determine to need to create certain section link of MA on ethernet ring network; The ID sign of the node described in this step among the MA must be identical, selects node S2 to the link between the node S3 herein; And node S2 is defined as the MEP1 node, node S3 is defined as the MEP2 node;
Step 25, operating personnel set up the contingency table in this node and Ethernet ring protection territory, place for each MEP node; Described contingency table is used to describe this MEP node and belongs to which Ethernet ring protection territory, and the positional information of the host node in this Ethernet ring protection territory;
Step 26, when ethernet ring network was started working, the CC function was opened in the Ethernet ring protection territory automatically; Carry out link check and protection switching operation, concrete steps are as follows:
Step 41, every predefined transmitting time, the MEP1 node among the MA sends CCM message protocol information to the MEP2 node, carries the time that transmit leg sends this message in the described CCM message protocol information, and the place of this transmit leg;
Described transmitting time specifically can be that CCM agreement regulation message sends cycle 3.3ms;
Step 42 is kept at the CCM message protocol information that receives in the self database when the MEP2 node receives the CCM message protocol information of MEP1 node transmission, and illustrate that link is normal this moment; When the MEP2 node does not receive the CCM message protocol information of MEP1 node transmission in the predefined stand-by period, illustrate that then link breaks down, forward step 43 to;
The described stand-by period is for sending the multiple of CCM message protocol information required time; Concrete, can be that 3 times of message transmission cycle required time are 9.9ms;
Step 43, when link broke down, the MEP2 node was searched the contingency table of self preserving, and therefrom determined the Ethernet ring protection territory at self place, the positional information of the host node in this Ethernet ring protection territory of searching from this contingency table simultaneously;
Step 44, the MEP2 node is the positional information of S1 node according to the host node that finds, and sends a warning message to this host node;
Step 45; after this host node receives warning information; by the agreement computing will be that the physics forwarding capability of the link between S1 and the S4 is changed to effectively from port link of living in, and it is invalid that the physics forwarding capability of the link between S1 and the S2 is changed to, and finishes the link protection change operation.
Embodiment two:
As shown in Figure 5, the embodiment of the invention two provides a kind of method that has the ethernet ring network link protection change of transparent transmission equipment, in this ethernet ring network, there are as shown in Figure 1 node S1, S2, S3, S4, only be concerned about in the present embodiment that node S2 is to the link working state between the node S4, therefore, can be considered transparent transmission equipment for node S3; And think that the ID sign of S2, S3, S4 is identical for convenience of introducing, present embodiment is provided with a MD for this ethernet ring network, and only comprising a MA among this MD is that example describes, and thinks that all nodes in this ethernet ring network all are used for the support information function of exchange.Detailed process is as follows:
Step 51, create that node in Ethernet ring protection territory, the ethernet ring network is set to host node or the physics forwarding capability of the link that links to each other with S4 from node, with S1 be changed to invalid operating procedure as step 21 as described in the step 23, repeat no more herein;
Because node S3 is a transparent transmission equipment, can node S3 be set to from node in this step;
Step 52, operating personnel are being provided with and setting up MA from node S2, S3, S4 place link in this ethernet ring network;
Step 53, in MA, operating personnel will be set to MEP1 node and MEP2 node respectively from node S2 with from node S4; Will be owing to node S3 be a transparent transmission equipment, therefore node S3 is set to the MIP node;
Step 54, operating personnel set up the contingency table in this node and Ethernet ring protection territory, place respectively on MEP1 node and MEP2; Described contingency table is used to describe this MEP node and belongs to which Ethernet ring protection territory, and the positional information of the host node in this Ethernet ring protection territory;
Step 55, when ethernet ring network was started working, the CC function was opened in the Ethernet ring protection territory automatically; Carry out link check operation and protection and switch,, repeat no more herein with step 26;
As shown in Figure 6, in this step, also can other not carry out the equipment of CCM message protocol transmission such as H1 and H2 and be set to transparent transmission equipment, and it is set to the MIP node.
As shown in Figure 7, a kind of device of ethernet ring network link protection change, this device comprises:
Sending module 61 is used in testing process, safeguards and safeguards among the associating MA that associating marginal point MEP node sends CCM message protocol information to opposite end MEP node;
Preferable, described sending module 61 is used for:
The MEP node sends the cycle to opposite end MEP node transmission CCM message protocol information every predefined message.
Preferable, described alarm sending module 64 comprises to be searched module 62 and sends submodule 63;
The described module 62 of searching, when being used for described opposite end MEP node and in the predefined stand-by period, not receiving this CCM message protocol information, this opposite end MEP node is according to predefined contingency table, searches the positional information of host node in the Ethernet ring protection territory at self place in described contingency table;
Described transmission submodule 63 is used for sending warning information according to this positional information to this host node.
Preferable, the described module 65 of switching, be used for when described host node when receiving warning information, this host node is switched another link into the described ethernet ring network at self place.
In sum, beneficial effect of the present invention:
By confirming that whether the MEP node among the MA receives the CCM message information that opposite end MEP node is sent, and can determine fast whether this MEP node place link breaks down; When determining to break down, this MEP node gives a warning to the host node in its Ethernet ring protection territory, place, after host node is received warning information, the link protection change operation is carried out in the Ethernet ring protection territory at this host node place, guarantee that with this ethernet ring network can be in normal operating conditions; As seen, adopt the present invention, can detect the fault that physical port shows with the non-form of rolling off the production line in the ethernet ring network, and can reduce the time of fault detect.
Those skilled in the art should understand that embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt complete hardware embodiment, complete software implementation example or in conjunction with the form of the embodiment of software and hardware aspect.And the present invention can adopt the form that goes up the computer program of implementing in one or more computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) that wherein include computer usable program code.
The present invention is that reference is described according to the flow chart and/or the block diagram of method, equipment (system) and the computer program of the embodiment of the invention.Should understand can be by the flow process in each flow process in computer program instructions realization flow figure and/or the block diagram and/or square frame and flow chart and/or the block diagram and/or the combination of square frame.Can provide these computer program instructions to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, make the instruction of carrying out by the processor of computer or other programmable data processing device produce to be used for the device of the function that is implemented in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame appointments.
These computer program instructions also can be stored in energy vectoring computer or the computer-readable memory of other programmable data processing device with ad hoc fashion work, make the instruction that is stored in this computer-readable memory produce the manufacture that comprises command device, this command device is implemented in the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.
These computer program instructions also can be loaded on computer or other programmable data processing device, make on computer or other programmable devices and to carry out the sequence of operations step producing computer implemented processing, thereby the instruction of carrying out on computer or other programmable devices is provided for being implemented in the step of the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.
Although described the preferred embodiments of the present invention, in a single day those skilled in the art get the basic creative notion of cicada, then can make other change and modification to these embodiment.So claims are intended to all changes and the modification that are interpreted as comprising preferred embodiment and fall into the scope of the invention.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (9)
1. the method for an ethernet ring network link protection change is characterized in that, this method comprises:
In testing process, safeguard and safeguard among the associating MA that associating marginal point MEP node sends CCM message protocol information to opposite end MEP node;
When described opposite end MEP node did not receive this CCM message protocol information in the predefined stand-by period, the host node to himself Ethernet ring protection territory, place sent warning information;
Described host node carries out the link protection change operation to the ethernet ring network at this host node place when receiving warning information.
2. the method for ethernet ring network link protection change as claimed in claim 1 is characterized in that, comprises two or more MEP nodes among the described maintenance associating MA.
3. the method for ethernet ring network link protection change as claimed in claim 1 is characterized in that, the described associating marginal point MEP node of safeguarding in safeguarding associating MA comprises to opposite end MEP node transmission CCM message protocol information:
The MEP node sends CCM message protocol information every predefined transmitting time to opposite end MEP node.
4. the method for ethernet ring network link protection change as claimed in claim 1; it is characterized in that; when described opposite end MEP node does not receive this CCM message protocol information in the predefined stand-by period, send warning information to the host node in himself Ethernet ring protection territory, place and comprise:
When described opposite end MEP node does not receive this CCM message protocol information in the predefined stand-by period; this opposite end MEP node is according to predefined contingency table; in described contingency table, search the positional information of host node in the Ethernet ring protection territory at self place, and send warning information to this host node according to this positional information.
5. the method for ethernet ring network link protection change as claimed in claim 1 is characterized in that, described host node carries out the link protection change operation to the ethernet ring network at this host node place and comprises when receiving warning information:
When described host node when receiving warning information, this host node is switched another link into the ethernet ring network at self place.
6. the device of an ethernet ring network link protection change is characterized in that, this device comprises:
Sending module is used in testing process, safeguards and safeguards among the associating MA that associating marginal point MEP node sends CCM message protocol information to opposite end MEP node;
The alarm sending module, when being used for described opposite end MEP node not receiving this CCM message protocol information in the predefined stand-by period, the host node to himself Ethernet ring protection territory, place sends warning information; Described too looped network protection territory comprises the host node of ethernet ring network;
Switch module, be used for described host node when receiving warning information, the ethernet ring network at this host node place is carried out the link protection change operation.
7. the device of ethernet ring network link protection change as claimed in claim 6 is characterized in that, described sending module is used for:
The MEP node sends CCM message protocol information every predefined transmitting time to opposite end MEP node.
8. the device of ethernet ring network link protection change as claimed in claim 6 is characterized in that, described alarm sending module comprises to be searched module and send submodule;
The described module of searching, when being used for opposite end MEP node and in the predefined stand-by period, not receiving this CCM message protocol information, this opposite end MEP node is according to predefined contingency table, searches the positional information of host node in the Ethernet ring protection territory at self place in described contingency table;
Described transmission submodule is used for sending warning information according to this positional information to this host node.
9. the device of ethernet ring network link protection change as claimed in claim 6 is characterized in that, the described module of switching, be used for when described host node when receiving warning information, this host node is switched another link into the ethernet ring network at self place.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105768599A CN102045230A (en) | 2010-12-07 | 2010-12-07 | Ethernet link protection switching method and device |
| PCT/CN2011/071451 WO2012075743A1 (en) | 2010-12-07 | 2011-03-02 | Method and device for link protection switching in an ethernet ring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2010105768599A CN102045230A (en) | 2010-12-07 | 2010-12-07 | Ethernet link protection switching method and device |
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