CN102238138A - Pseudo wire service processing method and system - Google Patents
Pseudo wire service processing method and system Download PDFInfo
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Abstract
The invention discloses a pseudo wire service processing method, which comprises the following steps of: negotiating about the consistency of pseudo wire freeze configuration between a local provider edge (PE) and a remote PE in a static configuration or signaling notification way; if a signaling session between the local PE and the remote PE is interrupted or protocol processors of the local PE and the remote PE fail when the local PE and the remote PE are both configured with the freeze attribute of a pseudo wire, continuously keeping the forwarding state of the pseudo wire. The invention also discloses a pseudo wire service processing device. By the method and the device provided by the invention, the service forwarding state of the pseudo wire is continuously kept, and a pseudo wire service corresponding to the signaling session may not be stopped if the signaling session is interrupted or the protocol processors of the local PE and the remote PE fail, thereby ensuring the continuous forwarding of a customer service.
Description
Technical field
The present invention relates to the pseudo-line technology in the network service, relate in particular to a kind of processing method and system of pseudo-line service.
Background technology
(PW, Pseudowire) technology is the solution that proposes at following converged communication network to pseudo-line, is the technology that 1 layer of simulation tradition and 2 layer network business are provided on packet network.Pseudo-line technology almost is applicable to all-network, comprises transmission network and Access Network, can make multiple label switching technology (MPLS, Multi-Protocol Label Switch) break through core network, realizes Access Network and the real convergence of metropolitan area network.
Pseudo-line is at edge router (PE, Provider Edge) a point-to-point connection between, at the Internet engineering duty group (IETF, Internet Engineering Task Force) defined creating a mechanism of pseudo-line among the RFC4447, adopt target labels distribution protocol (T-LDP, Target Label DistributeProtocol) session is set up pseudo-line as signaling mechanism, and carries out the label exchange and the parameter negotiation of pseudo-line.Pseudo-line, the position of T-LDP session in network, as shown in Figure 1.When the T-LDP session was interrupted owing to some fault, edge router need be removed the pairing pseudo-line of this fault session, comprised discharging the pairing label forwarding information of pseudo-line, and client's business that corresponding pseudo-line carried also can be interrupted.
The T-LDP session is because it is based on Internet Protocol (IP; Internet Protocol) characteristic is subjected to the influence of unstable networks or fault easily, and lacks effective protection mechanism; the automatic convergence that relies on IP can cause very long convergence time again, generally more than 40 seconds.In some cases, the T-LDP session is the packet network tunnel (PSN Tunnel) that can be independent of carrying pseudo-line, and when the T-LDP conversation, the pairing PSN Tunnel of pseudo-line may remain intact.This moment owing to the interruption of T-LDP session causes the interruption of pseudo-line, thereby cause the interruption of client's business, cause the availability of pseudo-line to reduce greatly.
Existingly steadily restart (Graceful Restart) mechanism and separate the chain of command and the forwarding face of pseudo-line by using, when the T-LDP conversation, can continue to keep professional forwarding, and the maintenance business is not interrupted.But Graceful Restart function is under the situation that hypothesis far-end PE member is restarted and the mechanism of design is all associated pseudo-line services of T-LDP session between two reciprocity each other PE thereby limited its sphere of action.If customer requirements some pseudo-line service in certain T-LDP session, service needed kept when it interrupted in signaling, and to other pseudo-line services, service needed was interrupted when it interrupted in signaling, and at this moment existing Graceful Restart just can't finish this function.In addition, existing Graceful Restart has the maximum time restriction for the retention time of business; That is to say, when time of T-LDP conversation surpass Graceful Restart restart the stand-by period (Restart time) time, the PE that sets up pseudo-line still can delete pseudo-line, and pseudo-line institute loaded service is interrupted.In addition, enabling of graceful restart mechanism can only be unit with the session, if i.e. certain session initiation graceful restart mechanism, then all have graceful restart mechanism by the pseudo-line of this session.If the user wishes that only certain some pseudo-line can be independent of control aspect and forwarding plane, then can't accomplish.
Based on Border Gateway Protocol (BGP, Border Gateway Protocol) VPLS (VPLS of signaling method, Virtual Private LAN Service), by the BGP signaling finish that VPLS member finds automatically, the exchange of the label of pseudo-line and parameter negotiation.VPLS, pseudo-line, the position of BGP signaling session in network, as shown in Figure 2.When the BGP signaling was interrupted owing to some fault, the PE member of VPLS can delete pairing pseudo line tag, thereby caused the VPLS service disconnection.
The session of BGP signaling is subjected to the influence of unstable networks or fault easily, and lacks effective protection mechanism owing to the characteristic of its IP.In some cases, the session of BGP signaling is to be independent of the packet network tunnel (PSN Tunnel) of carrying customer service, when BGP signaling conversation, the pairing PSN Tunnel of pseudo-line between two VPLS member PE may remain intact.This moment, the interruption owing to the session of BGP signaling caused the interruption of pseudo-line, thereby caused the interruption of client's business that pseudo-line carries, and the availability of VPLS is reduced greatly.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of processing method and system of pseudo-line service, to improve the availability of pseudo-line.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention provides a kind of processing method of pseudo-line service, this method comprises:
By the mode of static configuration or signaling announcement, consult pseudo-line and freeze configuration consistency between local edge router (PE) and the far-end PE;
Described local PE and far-end PE all disposed pseudo-line freeze attribute the time, if the signaling conversation between described local PE and the far-end PE, the protocol processor of perhaps local PE and far-end PE lost efficacy, and then continued to keep the forwarding state of described pseudo-line.
Described signaling session comprises: all of based target tag distribution protocol (T-LDP) and Border Gateway Protocol (BGP) are set up the session of pseudo-line.
The protocol processor of described local PE and far-end PE has the main-apparatus protection function, perhaps has the function that pseudo-line information is kept at nonvolatile memory (Non-Volatile ROM).
This method further comprises:
Local PE and far-end PE send pseudo-line attribute announcement to the opposite end respectively, described local PE and far-end PE judge by the pseudo-line attribute announcement that receives whether the opposite end disposes the attribute that freezes of pseudo-line respectively, and then judge whether consistent the pseudo-line of described local PE and far-end PE freezes to dispose.
Consult pseudo-line by the mode of signaling announcement between described local PE and the far-end PE and freeze configuration consistency, be specially:
Local PE goes up the attribute that freezes of the pseudo-line of configuration, and gives described far-end PE with the described attribute that freezes by the signaling session announcement, and described far-end PE is freezed attribute according to the signaling session configuration that receives, and sends pseudo-line attribute announcement to described local PE; Perhaps,
On the far-end PE the pseudo-line of configuration freeze attribute, and will describedly freeze attribute and give described local PE by the signaling session announcement, described local PE freezes attribute according to the signaling session configuration that receives, and sends pseudo-line attribute to described far-end PE and announce.
By the mode of signaling announcement, consult pseudo-line and freeze configuration consistency between described local PE and the far-end PE, specifically comprise:
Attribute is freezed in configuration on described local PE or the far-end PE, and the attribute that freezes that will dispose sends to the PE of opposite end by the mode of signaling announcement, and the PE of described opposite end is configured according to the attribute that freezes of reception;
Perhaps, on described local PE and the far-end PE respectively configuration freeze attribute, and the attribute that freezes that will dispose sends to the PE of opposite end by the mode of signaling announcement, the configuration consistency of attribute is freezed in described local PE and far-end PE negotiation.
Local PE and far-end PE all disposed pseudo-line freeze attribute after, this method further comprises: transmit pseudo-presence information by pseudo-line association channel between described local PE and the far-end PE.
The present invention also provides a kind of processing unit of pseudo-line service, is applied in local PE and the far-end PE, and this device comprises:
Configuration module is used for the mode by static configuration or signaling announcement, and the pseudo-line of consulting local PE and far-end PE freezes configuration consistency;
Service Processing Module, be used for described local PE and far-end PE all disposed pseudo-line freeze attribute the time, if the signaling conversation between described local PE and the far-end PE, the protocol processor of perhaps local PE and far-end PE lost efficacy, and then continued to keep the forwarding state of described pseudo-line.
Described signaling session comprises: set up the session of pseudo-line based on all of T-LDP and BGP.
The protocol processor of described local PE and far-end PE has the main-apparatus protection function, perhaps has the function that pseudo-line information is kept at Non-Volatile ROM.
Described configuration module is further used for, send pseudo-line attribute announcement to the opposite end of PE, and judge by the pseudo-line attribute announcement that receives the opposite end whether the opposite end disposes the attribute that freezes of pseudo-line, and then judge whether consistent the pseudo-line of described local PE and far-end PE freezes to dispose.
Described configuration module is further used for, and disposes the attribute that freezes of pseudo-line, gives the opposite end of place PE with the described attribute that freezes by the signaling session announcement, and receives the pseudo-line attribute announcement that the opposite end sends.
Described configuration module is further used for, and attribute is freezed in configuration on described local PE or far-end PE, and the attribute that freezes that will dispose sends to the PE of opposite end by the mode of signaling announcement, and the PE that triggers described opposite end is configured according to the attribute that freezes of reception;
Perhaps, attribute is freezed in configuration respectively on described local PE and far-end PE, and the attribute that freezes that will dispose sends to the PE of opposite end by the mode of signaling announcement, triggers the configuration consistency that attribute is freezed in the negotiation of described local PE and far-end PE.
Described Service Processing Module is further used for, local PE and far-end PE all disposed pseudo-line freeze attribute after, by the pseudo-presence information between pseudo-line association channel transmitting locally PE and the far-end PE.
The processing method of a kind of pseudo-line service provided by the present invention and system by the mode of announcing by static configuration or signaling between local PE and the far-end PE, consult pseudo-line and freeze configuration consistency; Local PE and far-end PE all disposed pseudo-line freeze attribute the time, if the signaling conversation between local PE and the far-end PE, the protocol processor of perhaps local PE and far-end PE lost efficacy, and then continues to keep the forwarding state of pseudo-line, thereby the chain of command of pseudo-line is separated fully with forwarding face.By the present invention, interrupt in signaling session (comprise based on T-LDP and BGP all set up the session of pseudo-line), when the protocol processor of perhaps local PE and far-end PE lost efficacy, make pseudo-line continue to keep its professional state of transmitting, do not remove the pairing pseudo-line service of this signaling session, thereby the continuation that guarantees client's business is transmitted, and improves the availability of pseudo-line.
Description of drawings
Fig. 1 is pseudo-line in the prior art, the position view of T-LDP session in network;
Fig. 2 is VPLS in the prior art, pseudo-line, the position view of BGP signaling session in network;
Fig. 3 freezes the flow chart of attribute by the pseudo-line of T-LDP session announcement for the embodiment of the invention one;
Fig. 4 freezes the flow chart of attribute by the static configuration notifying pseudo-lines for the embodiment of the invention two;
Fig. 5 freezes attribute for the embodiment of the invention three by only disposing at monolateral PE, and the pseudo-line of T-LDP session announcement freezes the flow chart that attribute is given far-end PE;
Fig. 6 crosses the flow chart that BGP signaling session announcement VPLS freezes attribute for embodiment of the invention four-way;
Fig. 7 crosses the flow chart that static configuration announcement VPLS freezes attribute for embodiment of the invention five-way;
Fig. 8 freezes attribute for the embodiment of the invention six by only disposing at monolateral PE, and bgp session announcement VPLS freezes the flow chart that attribute is given far-end PE.
Embodiment
The technical solution of the present invention is further elaborated below in conjunction with the drawings and specific embodiments.
Consider IETF RFC4447 and RFC4761 provided that pseudo-line sets up and remove mechanism, the client's business that makes pseudo-line easily and carried is subjected to the influence of signaling session upheaval, has reduced the availability of pseudo-line.For this reason, the invention provides a kind of mechanism that improves pseudo-line availability, when being intended to the signaling conversation, make pseudo-line continue to keep its professional state of transmitting, do not remove the pairing pseudo-line service of this signaling session, thereby the continuation that guarantees client's business is transmitted.
The present invention is based on following core concept: the signaling conversation, the protocol processor of perhaps local PE and far-end PE lost efficacy, and the transfer capability of PW may still can keep; Thereby propose (Freeze) state that freezes of PW and (Unfreeze) state that thaws, be in the PW of Freeze state, its transfer capability is not subjected to the signaling session, the influence that the protocol processor of perhaps local PE and far-end PE lost efficacy; Be in the PW of Unfreeze state, its transfer capability will be subjected to the signaling session, the influence that the protocol processor of perhaps local PE and far-end PE lost efficacy.The protocol processor of so-called local PE and far-end PE lost efficacy, and was meant at least one inefficacy in the protocol processor of local PE and far-end PE.
Based on above-mentioned thought, the processing method of a kind of pseudo-line service provided by the present invention mainly may further comprise the steps:
Step 201 by the mode of static configuration or signaling announcement, is consulted pseudo-line and is freezed configuration consistency between local PE and the far-end PE.
So-called static configuration, promptly local PE and far-end PE respectively static configuration identical freeze attribute.The mode of so-called signaling announcement, by Signalling exchange, it is consensus to realize that pseudo-line freezes to dispose between promptly local PE and the far-end PE.For example: attribute is freezed in configuration on local PE or the far-end PE, and the attribute that freezes that will dispose sends to the PE of opposite end by the mode of signaling announcement, and the PE of opposite end is configured according to the attribute that freezes of reception; Perhaps, on local PE and the far-end PE respectively configuration freeze attribute, and the attribute that freezes that will dispose sends to the PE of opposite end by the mode of signaling announcement, the configuration consistency of attribute is freezed in local PE and far-end PE negotiation.Its specific implementation operation will be described in detail in follow-up embodiment.
Step 202, local PE and far-end PE all disposed pseudo-line freeze attribute the time, if the signaling conversation between local PE and the far-end PE, the protocol processor of perhaps local PE and far-end PE lost efficacy, and then continued to keep the forwarding state of pseudo-line.So-called signaling session comprises that based on T-LDP and BGP all set up the session of pseudo-line.
Pseudo-line of the present invention is the pseudo-line category of a broad sense, comprises pseudo-line of single-hop and multi-hop counterfeit wire.Local PE and far-end PE operation behavior are equally applicable to the exchange provider fringe node (S-PE, Switching PE) of multi-hop counterfeit wire.
Further elaborate below in conjunction with the processing method of specific embodiment above-mentioned pseudo-line service.
As shown in Figure 3, freeze the flow process of attribute for the embodiment of the invention one by the pseudo-line of T-LDP session announcement, this flow process may further comprise the steps:
Need to prove that local PE can dispose pseudo-line and freeze attribute after pseudo-line is set up successfully, also can before pseudo-line be set up, dispose pseudo-line and freeze attribute.
Need to prove, do not receive the pseudo-line attribute announcement of far-end PE at local PE; Perhaps local PE receives the pseudo-line attribute announcement of far-end PE, but does not have when freezing attribute in the announcement, and all execution in step 310.
After pseudo-line freezing function came into force, if the T-LDP conversation, the protocol processor of perhaps local PE and far-end PE lost efficacy, and will continue to keep the forwarding state of this pseudo-line, comprise the pseudo-line outgoing label received from far-end PE and local distribute go into tag entry; Simultaneously local PE proceeds the forwarding of client's business that pseudo-line carries.If this moment, the PSN Tunnel of carrying pseudo-line service also interrupted, then professional can the interruption.
Step 307 has the pseudo-line that freezes attribute, and after pseudo-line was set up successfully, information will be no longer by the T-LDP session transmissions for the pseudo-line states (PW Status comprises information such as PW UP/DOWN) by the T-LDP session transmissions.Can select to transmit, also can select not transmit pseudo-presence information by pseudo-line association channel (PW associated channel).
Need to prove that after pseudo-line was thawed, the user can carry out the configuration of freezing of pseudo-line again, with reference to abovementioned steps 302～307.Far-end PE also needs to carry out and above-mentioned local PE identical functions operation (with reference to step 301～310), repeats no more herein.
As shown in Figure 4, freeze the flow process of attribute for the embodiment of the invention two by the static configuration notifying pseudo-lines, this flow process may further comprise the steps:
Step 401, the user disposes the T-LDP session on local PE, with and far-end PE between set up the T-LDP session, in order to transmit the signaling message of pseudo-line.
Step 402 disposes pseudo-line service on local PE, comprise the information such as ID of pseudo-line ID, pseudo-line type, far-end PE, needs to dispose the attribute that freezes of pseudo-line simultaneously.This step and step 401 do not have strict ordinal relation.
Step 403, judging whether pseudo-line on the local PE has disposed freezes attribute, if, execution in step 404; Otherwise, execution in step 407.
Step 404, pseudo-line freezing function comes into force.
After pseudo-line freezing function came into force, if the T-LDP conversation, the protocol processor of perhaps local PE and far-end PE lost efficacy, and will continue to keep the forwarding state of this pseudo-line, comprise the pseudo-line outgoing label received from far-end PE and local distribute go into tag entry.Simultaneously local PE proceeds the forwarding of client's business that pseudo-line carries.If this moment, the PSN Tunnel of carrying pseudo-line service also interrupted, then professional can the interruption.
Need to prove that the user need guarantee that local PE and far-end PE have disposed the attribute that freezes of this pseudo-line simultaneously by configuration, otherwise can cause an end of pseudo-line that professional transmission is arranged, and the other end does not have professional the reception, forms network black hole phenomenon.
Step 405 has the pseudo-line that freezes attribute, and after pseudo-line was set up successfully, information will be no longer by the T-LDP session transmissions for the pseudo-line states (PW Status comprises information such as PW UP/DOWN) by the T-LDP session transmissions.Can select to transmit, also can select not transmit pseudo-presence information by pseudo-line association channel (PW associated channel).
Step 406, according to user's demand, the user can delete the attribute that freezes of pseudo-line on local PE, perhaps be called thaw (Unfreeze).Pseudo-line freeze attribute deleted after, if this moment, the T-LDP session was normal, then local PE is described according to RFC4447, need resend the LDP mapping message and give far-end PE so that far-end PE have this pseudo-line to client information.If this moment, the T-LDP session was interrupted, then local PE need delete the forwarding information of this pseudo-line, and the broken clients business.
Step 407, if local PE does not support pseudo-line freezing function, then local PE does not freeze operation to pseudo-line, carries out according to the described standard operation of RFC4447.
Need to prove, after pseudo-line is thawed, the user can carry out again pseudo-line freeze the configuration, refer step 402～405.Far-end PE also needs to carry out and above-mentioned local PE identical functions operation (step 401～407), repeats no more herein.
As shown in Figure 5, freeze attribute for the embodiment of the invention three by only disposing at monolateral PE, the pseudo-line of T-LDP session announcement freezes the flow process that attribute is given far-end PE, and this flow process may further comprise the steps:
Step 501, the user disposes the T-LDP session on local PE, with and far-end PE between set up the T-LDP session, in order to transmit the signaling message of pseudo-line.
Step 502 disposes pseudo-line service on local PE, comprise the information such as ID of pseudo-line ID, pseudo-line type, far-end PE.This step and step 501 do not have strict ordinal relation.
Step 503, only on local PE the pseudo-line of configuration freeze attribute, and local PE gives far-end PE with this attribute by the T-LDP session announcement.Far-end PE is according to the attribute that freezes of the signaling session configuration that receives self.
Local PE can dispose pseudo-line and freeze attribute after pseudo-line be set up successfully, also can dispose pseudo-line and freeze attribute before pseudo-line be set up.
Step 504～505, far-end PE sends pseudo-line attribute announcement by the T-LDP session to local PE, and then pseudo-line freezing function comes into force.
After pseudo-line freezing function came into force, if the T-LDP conversation, the protocol processor of perhaps local PE and far-end PE lost efficacy, and will continue to keep the forwarding state of this pseudo-line, comprise the pseudo-line outgoing label received from far-end PE and local distribute go into tag entry.Simultaneously local PE proceeds the forwarding of client's business that pseudo-line carries.If this moment, the PSN Tunnel of carrying pseudo-line service also interrupted, then professional can the interruption.
Step 506 has the pseudo-line that freezes attribute, and after pseudo-line was set up successfully, information will be no longer by the T-LDP session transmissions for the pseudo-line states (PW Status comprises information such as PW UP/DOWN) by the T-LDP session transmissions.Can select to transmit, also can select not transmit pseudo-presence information by pseudo-line association channel (PW associated channel).
Step 507, according to user's demand, the user can delete the attribute that freezes of pseudo-line on local PE, perhaps be called thaw (Unfreeze).Pseudo-line freeze attribute deleted after, if this moment, the T-LDP session was normal, then local PE is described according to RFC4447, need resend the LDP mapping message and give far-end PE so that far-end PE have this pseudo-line to client information.If this moment, the T-LDP session was interrupted, then local PE need delete the forwarding information of this pseudo-line, and the broken clients business.
Step 508, in local PE and far-end PE, if a side is restarted, and under the situation that the opposing party does not have to restart, the side of restarting can resend the PW information after the renewal.Frozen PW if the renewal of receiving PW information from the T-LDP session then needs to carry out the renewal of PW information, is up-to-date to remain PW information.In the process of PW information updating, may cause professional interruption.After pseudo-line was frozen, if the control board of equipment has the main-apparatus protection function, then master control borad need be synchronized to the forwarding information of pseudo-line the backup control board.If equipment does not have the main-apparatus protection function, equipment can be preserved the forwarding information of pseudo-line by additive method, as is kept among the Non-Volatile ROM.After masterslave switchover or equipment are restarted, rebulid the T-LDP session, be frozen state if find pseudo-line, and can obtain complete correct forwarding information, then still need information by this pseudo-line of T-LDP session updates.
Need to prove, after pseudo-line is thawed, the user can carry out again pseudo-line freeze the configuration, refer step 502～506.Above-mentioned is that example describes with local PE, if so-called " attribute is freezed in monolateral PE configuration " refers to far-end PE, the class of operation of the performed operation of far-end PE and above-mentioned local PE seemingly (step 501～508) repeats no more herein so.
Again as shown in Figure 6, be that embodiment of the invention four-way is crossed the flow process that BGP signaling session announcement VPLS freezes attribute, this flow process may further comprise the steps:
Step 603 judges that whether having disposed VPLS on the local PE freezes attribute, if, execution in step 604; Otherwise, execution in step 609.
Need to prove that local PE can be after VPLS sets up successfully, configuration VPLS freezes attribute, also can be before VPLS set up, and configuration VPLS freezes attribute.
Step 605 judges whether local PE receives the VPLS attribution notices of far-end PE, and has in the pseudo-line attribute announcement and freeze attribute, if, execution in step 606; Otherwise, execution in step 609.
Need to prove, do not receive the VPLS attribution notices of far-end PE at local PE; Perhaps local PE receives the VPLS attribution notices of far-end PE, but when not having VPLS and freeze attribute in the announcement, all execution in step 609.
After pseudo-line freezing function comes into force, if BGP signaling conversation, the protocol processor of perhaps local PE and far-end PE lost efficacy, and will continue to keep the forwarding state between these two PE, comprised that pseudo-line outgoing label and the local pseudo-line that distributes received from far-end PE go into tag entry.This locality/far-end PE is proceeded the forwarding of client's business that pseudo-line carried of VPLS simultaneously.If this moment, the PSNTunnel of carrying pseudo-line service also interrupted, then professional can the interruption.
Need to prove, after pseudo-line is thawed, the user can carry out again pseudo-line freeze the configuration, refer step 602～606.Far-end PE need be carried out and above-mentioned local PE identical functions operation (step 601～609), repeats no more herein.
As shown in Figure 7, cross the flow process that static configuration announcement VPLS freezes attribute for embodiment of the invention five-way, this flow process may further comprise the steps:
Step 702 disposes the VPLS business on local PE, comprise the information such as RD, VEID of RT, the VPLS of VPLS, needs to dispose this VPLS simultaneously and freezes attribute.This step and step 701 do not have strict ordinal relation.
After pseudo-line freezing function comes into force, if BGP signaling conversation, the protocol processor of perhaps local PE and far-end PE lost efficacy, and will continue to keep the forwarding state between these two PE, comprised that the PW outgoing label and the local PW that distributes that receive from far-end PE go into tag entry.This locality/far-end PE is proceeded the forwarding of client's business that pseudo-line carried of VPLS simultaneously.If this moment, the PSNTunnel of carrying pseudo-line service also interrupted, then professional can the interruption.
Need to prove that the user need guarantee that local PE and far-end PE have disposed the attribute that freezes of this VPLS simultaneously by configuration, otherwise can cause an end of two pseudo-lines between the PE that professional transmission is arranged, and the other end does not have professional the reception, forms network black hole phenomenon.
Need to prove, after pseudo-line is thawed, the user can carry out again pseudo-line freeze the configuration, refer step 702～704.Far-end PE need be carried out and above-mentioned local PE identical functions operation (step 701～706), repeats no more herein.
As shown in Figure 8, freeze attribute for the embodiment of the invention six by only disposing at monolateral PE, the pseudo-line of bgp session announcement VPLS freezes the flow process that attribute is given far-end PE, and this flow process may further comprise the steps:
Step 802 disposes the VPLS business on local PE and far-end PE, comprise the information such as RD, VEID of RT, the VPLS of VPLS.This step and step 801 do not have strict ordinal relation.
Local PE can be after VPLS sets up successfully, and configuration VPLS freezes attribute, also can be before VPLS set up, and configuration VPLS freezes attribute.
Step 804～805, far-end PE sends the VPLS attribution notices by the session of BGP signaling to local PE, and then pseudo-line freezing function comes into force.This freezing function only comes into force to the pseudo-line between these two PE.
After pseudo-line freezing function comes into force, if BGP signaling conversation, the protocol processor of perhaps local PE and far-end PE lost efficacy, and will continue to keep the forwarding state between these two PE, comprised that pseudo-line outgoing label and the local pseudo-line that distributes received from far-end PE go into tag entry.This locality/far-end PE is proceeded the forwarding of client's business that pseudo-line carried of VPLS simultaneously.If this moment, the PSNTunnel of carrying pseudo-line service also interrupted, then professional can the interruption.
Need to prove, after pseudo-line is thawed, the user can carry out again pseudo-line freeze the configuration, refer step 802～805.Above-mentioned is that example describes with local PE, if so-called " attribute is freezed in monolateral PE configuration " refers to far-end PE, the class of operation of the performed operation of far-end PE and above-mentioned local PE seemingly (step 801～807) repeats no more herein so.
The processing method of corresponding above-mentioned pseudo-line service, the present invention also provides a kind of processing unit of pseudo-line service, is applied in local PE and the far-end PE, and this device comprises: configuration module and Service Processing Module.Configuration module is used for the mode by static configuration or signaling announcement, and the pseudo-line of consulting local PE and far-end PE freezes configuration consistency.Service Processing Module, be used for local PE and far-end PE all disposed pseudo-line freeze attribute the time, if the signaling conversation between local PE and the far-end PE then continues to keep the forwarding state of pseudo-line.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (14)
1. the processing method of a pseudo-line service is characterized in that, this method comprises:
By the mode of static configuration or signaling announcement, consult pseudo-line and freeze configuration consistency between local edge router (PE) and the far-end PE;
Described local PE and far-end PE all disposed pseudo-line freeze attribute the time, if the signaling conversation between described local PE and the far-end PE, the protocol processor of perhaps local PE and far-end PE lost efficacy, and then continued to keep the forwarding state of described pseudo-line.
2. according to the processing method of the described pseudo-line service of claim 1, it is characterized in that described signaling session comprises: all of based target tag distribution protocol (T-LDP) and Border Gateway Protocol (BGP) are set up the session of pseudo-line.
3. according to the processing method of the described pseudo-line service of claim 1, it is characterized in that the protocol processor of described local PE and far-end PE has the main-apparatus protection function, perhaps have the function that pseudo-line information is kept at nonvolatile memory (Non-Volatile ROM).
4. according to the processing method of claim 1,2 or 3 described pseudo-line services, it is characterized in that this method further comprises:
Local PE and far-end PE send pseudo-line attribute announcement to the opposite end respectively, described local PE and far-end PE judge by the pseudo-line attribute announcement that receives whether the opposite end disposes the attribute that freezes of pseudo-line respectively, and then judge whether consistent the pseudo-line of described local PE and far-end PE freezes to dispose.
5. according to the processing method of claim 1,2 or 3 described pseudo-line services, it is characterized in that, consult pseudo-line by the mode of signaling announcement between described local PE and the far-end PE and freeze configuration consistency, be specially:
Local PE goes up the attribute that freezes of the pseudo-line of configuration, and gives described far-end PE with the described attribute that freezes by the signaling session announcement, and described far-end PE is freezed attribute according to the signaling session configuration that receives, and sends pseudo-line attribute announcement to described local PE; Perhaps,
On the far-end PE the pseudo-line of configuration freeze attribute, and will describedly freeze attribute and give described local PE by the signaling session announcement, described local PE freezes attribute according to the signaling session configuration that receives, and sends pseudo-line attribute to described far-end PE and announce.
6. according to the processing method of claim 1,2 or 3 described pseudo-line services, it is characterized in that, by the mode of signaling announcement, consult pseudo-line and freeze configuration consistency between described local PE and the far-end PE, specifically comprise:
Attribute is freezed in configuration on described local PE or the far-end PE, and the attribute that freezes that will dispose sends to the PE of opposite end by the mode of signaling announcement, and the PE of described opposite end is configured according to the attribute that freezes of reception;
Perhaps, on described local PE and the far-end PE respectively configuration freeze attribute, and the attribute that freezes that will dispose sends to the PE of opposite end by the mode of signaling announcement, the configuration consistency of attribute is freezed in described local PE and far-end PE negotiation.
7. according to the processing method of claim 1,2 or 3 described pseudo-line services, it is characterized in that, local PE and far-end PE all disposed pseudo-line freeze attribute after, this method further comprises: transmit pseudo-presence information by pseudo-line association channel between described local PE and the far-end PE.
8. the processing unit of a pseudo-line service is applied to it is characterized in that in local PE and the far-end PE that this device comprises:
Configuration module is used for the mode by static configuration or signaling announcement, and the pseudo-line of consulting local PE and far-end PE freezes configuration consistency;
Service Processing Module, be used for described local PE and far-end PE all disposed pseudo-line freeze attribute the time, if the signaling conversation between described local PE and the far-end PE, the protocol processor of perhaps local PE and far-end PE lost efficacy, and then continued to keep the forwarding state of described pseudo-line.
9. according to the processing unit of the described pseudo-line service of claim 7, it is characterized in that described signaling session comprises: set up the session of pseudo-line based on all of T-LDP and BGP.
10. according to the processing unit of the described pseudo-line service of claim 7, it is characterized in that the protocol processor of described local PE and far-end PE has the main-apparatus protection function, perhaps have the function that pseudo-line information is kept at Non-Volatile ROM.
11. the processing unit of 9 or 10 described pseudo-line services according to Claim 8,, it is characterized in that, described configuration module is further used for, send pseudo-line attribute announcement to the opposite end of PE, and judge by the pseudo-line attribute announcement that receives the opposite end whether the opposite end disposes the attribute that freezes of pseudo-line, and then judge whether consistent the pseudo-line of described local PE and far-end PE freezes to dispose.
12. the processing unit of 9 or 10 described pseudo-line services according to Claim 8,, it is characterized in that described configuration module is further used for, dispose the attribute that freezes of pseudo-line, give the opposite end of place PE with the described attribute that freezes by the signaling session announcement, and receive the pseudo-line attribute announcement that the opposite end sends.
13. the processing unit of 9 or 10 described pseudo-line services according to Claim 8,, it is characterized in that, described configuration module is further used for, attribute is freezed in configuration on described local PE or far-end PE, and the attribute that freezes that will dispose sends to the PE of opposite end by the mode of signaling announcement, and the PE that triggers described opposite end is configured according to the attribute that freezes that receives;
Perhaps, attribute is freezed in configuration respectively on described local PE and far-end PE, and the attribute that freezes that will dispose sends to the PE of opposite end by the mode of signaling announcement, triggers the configuration consistency that attribute is freezed in the negotiation of described local PE and far-end PE.
14. the processing unit of 9 or 10 described pseudo-line services according to Claim 8,, it is characterized in that, described Service Processing Module is further used for, local PE and far-end PE all disposed pseudo-line freeze attribute after, by the pseudo-presence information between pseudo-line association channel transmitting locally PE and the far-end PE.
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