CN101795232A - Network failure treating method and device - Google Patents
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Abstract
The invention discloses a network failure treating method and a device. The failure is quickly informed to a corresponding network device via a timely informing mechanism of the network failure, then the network device initiates a link circuit switching and avoiding defects to make the network convergence quick, so network packet loss is reduced, and the reliability of transmit is increased.
Description
Technical field
The present invention relates to communication technical field, particularly a kind of network failure processing method and equipment.
Background technology
MPLS (Multiprotocol Label Switching, the multi protocol label exchange) VPN (VirtualPrivate Network, VPN (virtual private network)) is a kind of IP (Internet Protocol based on the MPLS technology, network interconnection agreement) VPN, it is the MPLS technology of on network route and switching equipment, using, simplify the Route Selection mode of core router, utilization is in conjunction with the IP VPN of the label switched realization of traditional route technology, can be used to the Intranet (intranet) of structural wideband, Extranet (extranet) satisfies multiple business demand flexibly.
Adopt the MPLS VPN technologies to resolve into the network of isolating in logic to present networks, the application of this network of isolating in logic can be Protean: can be used in solve enterprise's interconnection, government identical/interconnection of different departments, also can the time be used to provide new business---as opening up a VPN specially, solve the problem of IP network address deficiency and QoS (Quality of Service, service quality) with this for IP telephone service.
VPLS (Virtual Private LAN Service, virtual special local area network service) is a kind of point of providing in common network L2VPN (Layer 2 VPN, two-layer virtual private network) business to multiple spot.VPLS makes the user site of isolating on the region can pass through MAN (Metropolitan Area Network, metropolitan area network) or WAN (Wide Area Network, wide area network) links to each other, and make the connection effect picture between each website the same in a LAN (Local Area Network, local area network (LAN)).
VPLS also claims TLS (Transparent LAN Service, transparent LAN service) or VirtualPrivate Switched Network Service (virtual proprietary switching network service).
VPLS provides the two-layer VPN service.In VPLS, the user is coupled together by multidrop network, is different from the Connection Service of the P2P (Point to Point, point-to-point) that traditional VPN provides.In fact VPLS is exactly at PE (Provide Edge, provider edge equipment) goes up a series of virtual switch of establishment and be leased to the user, the networking and the conventional switch of virtual switch are identical, and like this, the user just can realize the LAN of oneself by MAN or WAN.
To each common VPLS service, must between pe router, create n* (n-1)/2 PW (Pseudo Wire, virtual link).But these are all generated by signaling protocol, the pe router that the real shortcoming that such scheme can not be used on a large scale provides VC needs duplicate packet, for first packet and broadcasting, multicast message, each PE equipment need be to all opposite equip. broadcasting packets.Connect by classification, can reduce the burden that signaling protocol and packet duplicate, so that VPLS can large-scale application.
The schematic network structure of the access way of H-VPLS of the prior art (hierarchical vp LS) as shown in Figure 1.
In order to guarantee the reliability of access link, UPE (User-facing Provider Edge, user oriented provider edge equipment) generally all can have main/slave link, under the normal condition, the UPE uplink message can only be from UPW (User-facing Pseudo Wire, user oriented virtual link) transmits on 1, in case UPW1 detects defective, transmit obstructedly, UPE will initiate to switch immediately, uplink traffic is switched to UPW2 transmit, thereby guaranteed the forwarding reliability.
For example: under normal circumstances, CE (Custom Edge, user's border networks equipment) 1 sends to the message of CE3, under the normal condition the path of process as follows:
CE1---UPE---NPE (Network Provider Edge, the provider edge equipment of network-oriented) 1---NPE3---CE3
In case UPW1 detects fault (concrete detection mode is not limit), UPE can switch to flow following path immediately:
CE1——UPE——NPE2——NPE3——CE3
In the case, the flow forwarding is no problem.
In realizing process of the present invention, the inventor finds that there is following problem at least in prior art:
If fault occurs in PW1, because UPE directly is not connected with PW1, therefore, user-end provider edge can't perception PW1 fault, message still sends to NPE1 equipment, but, on NPE1 since PW1 fault can't send this flow, so, can only abandon this message, and then, cause data traffic to be lost in a large number, very big to the normal data transfer influence of network.
Summary of the invention
The invention provides a kind of network failure processing method and equipment,, fault message is diffused to related network device, make flow in time switch, reach the purpose that reduces traffic loss by signalling trouble mechanism timely.
For achieving the above object, one aspect of the present invention provides a kind of network failure processing method, be applied to comprise in the network system of a plurality of provider edge equipment PE, each PE sets up the empty PW that links respectively with between the adjacent PE, wherein, the provider edge equipment NPE that comprises at least one user oriented provider edge equipment UPE and a plurality of network-orienteds among described a plurality of PE, described UPE respectively with adjacent NPE between PW be specially user oriented void and link UPW, it is characterized in that, whether each described NPE detects each PW that self links to each other according to sense cycle and breaks down, and described method specifically may further comprise the steps:
When a NPE judges that a PW who self links to each other breaks down, whether there is UPW among each PW that described NPE inquiry connects self;
If have UPW among each PW that described NPE inquiry connects self, then send handoff request message to described UPE, make described UPE when meeting default switching condition, carry out the switching of UPW by described UPW, wherein, carry the identification information of described NPE self in the described handoff request message.
Preferably, when a NPE judges that a PW who self links to each other breaks down, also comprise:
The described PW that described NPE will break down is changed to down state.
Preferably, whether there is UPW among each PW that described NPE inquiry connects self, also comprises:
If do not have UPW among each PW that described NPE inquiry connects self, described NPE then abandons handling.
Preferably, described NPE sends handoff request message by described UPW to described UPE, makes described UPE when meeting default switching condition, carries out the switching of UPW, specifically comprises:
Described UPE judges according to the described identification information that carries in the described handoff request message whether described handoff request message is that NPE sends;
If judged result is for being, described UPE judges whether self UPW corresponding with described NPE is in state of activation, and whether the pairing backup of described UPW UPW is in the lock state;
If described UPE judgement self UPW corresponding with described NPE is in state of activation, and the pairing backup of described UPW UPW is in the lock state, described UPE switches to lock-out state with the UPW of described NPE correspondence, and UPW switches to state of activation with the pairing backup of described UPW.
Preferably, described NPE sends handoff request message by described UPW to described UPE, makes described UPE when meeting default switching condition, carries out also comprising after the switching of UPW:
Described NPE detects the described PW that breaks down according to sense cycle and whether recovers normal;
When judging the described PW that breaks down, recovers just often described NPE, described NPE sends recovery request message by described UPW to described UPE, make described UPE when meeting default recovery condition, the switching of carrying out UPW recovers, wherein, carry the identification information of described NPE self in the described recovery request message.
Preferably, recover just often, also comprise when described NPE judges the described PW that breaks down:
Described NPE will recover normal described PW and be changed to upstate.
Preferably, described NPE sends recovery request message by described UPW to described UPE, makes described UPE when meeting default recovery condition, and the switching of carrying out UPW recovers, and specifically comprises:
Described UPE judges according to the described identification information that carries in the described recovery request message whether described recovery request message is that NPE sends;
If judged result is for being, described UPE judges whether self UPW corresponding with described NPE is in the lock state, and whether the pairing backup of described UPW UPW is in state of activation;
If described UPE judges self UPW corresponding with described NPE and be in the lock state, and the pairing backup of described UPW UPW is in the lock state, and described UPE judges self whether to have disposed the recoverable mechanism of UPW;
Self disposed the recoverable mechanism of UPW if described UPE judges, described UPE switches to state of activation with the UPW of described NPE correspondence, and UPW switches to lock-out state with the pairing backup of described UPW.
On the other hand, the present invention also provides a kind of PE, is applied to comprise in the network system of a plurality of PE, each PE sets up PW respectively and between the adjacent PE, wherein, comprises at least one UPE and a plurality of NPE among described a plurality of PE, described UPE respectively and the PW between the adjacent NPE be specially UPW, comprising:
Module is set, is used to be provided with sense cycle;
Detection module, be connected and be used at described PE during with the described module that is provided with as NPE, whether break down according to described each the continuous PW of the set sense cycle detection of module self that is provided with, or whether recover normal according to the described set described PW that breaks down of sense cycle detection of module that is provided with;
Enquiry module with described detection module, is used at described PE as NPE, and described detection module judges the PW that a PW self linking to each other breaks down or breaks down recovers just often, inquires about among each PW that self connects whether have UPW;
Processing module, be connected with described enquiry module, be used at described PE as NPE, and when having UPW among each PW that described enquiry module inquiry connects self, send handoff request message or recovery request message by described UPW to described UPE, make described UPE when meeting the default switching condition or the condition of recovery, carry out the switching of UPW or switch recovering, wherein, carry the identification information of described NPE self in described handoff request message or the recovery request message.
Preferably, the described module that is provided with also is connected with described detection module, be used for when described detection module judges that a PW who self links to each other breaks down, the described PW that breaks down is changed to down state, or judge the PW that breaks down when described detection module and recover just often, will recover normal described PW and be changed to upstate.
Preferably, described PE also comprises:
Receiver module when described PE starts during as UPE, is used to receive handoff request message or the recovery request message that NPE sends by UPW;
Judge module, be connected with described receiver module, when described PE starts during as UPE, be used for the described identification information that carries according to the received handoff request message of described receiver module or recovery request message, judge whether described handoff request message or recovery request message are that NPE sends, if judged result is for being the further current state of judging UPW corresponding with described NPE and the pairing backup of described UPW UPW of described judge module;
Described processing module, be connected with described judge module with described receiver module, also be used for receiving handoff request message when described receiver module, and described judge module judges that the UPW corresponding with described NPE is in state of activation, when the pairing backup of described UPW UPW is in the lock state, the UPW of described NPE correspondence is switched to lock-out state, UPW switches to state of activation with the pairing backup of described UPW, or receive recovery request message when described receiver module, and described judge module judges that the UPW corresponding with described NPE is in the lock state, when the pairing backup of described UPW UPW is in state of activation, notify described judge module to judge whether described PE has disposed the recoverable mechanism of UPW, if judged result is for being, described processing module switches to state of activation with the UPW of described NPE correspondence, and UPW switches to lock-out state with the pairing backup of described UPW.
Compared with prior art, the present invention has the following advantages:
By using technical scheme of the present invention, timely informing mechanism by network failure, rapidly fault is informed the corresponding network equipment, initiate to switch by this network equipment then, evade the link that defective takes place, make network convergence rapid, thereby, reduce Network Packet Loss, improved the forwarding reliability.
Description of drawings
Fig. 1 is the schematic network structure of the access way of H-VPLS of the prior art (hierarchical vp LS);
Fig. 2 is the schematic flow sheet of a kind of network failure processing method proposed by the invention;
Fig. 3 is the schematic flow sheet of a kind of concrete application scenarios lower network fault handling method proposed by the invention;
Fig. 4 is the structural representation of a kind of PE proposed by the invention.
Embodiment
The problem that a large amount of VPN traffics that cause at public network PW fault in the prior art are lost, the present invention proposes a kind of method of the H-VPLS of raising forwarded reliability, by signalling trouble mechanism timely, fault message is notified to the relevant network equipment, make flow in time switch, reach the purpose that reduces traffic loss.
As shown in Figure 2, schematic flow sheet for a kind of network failure processing method proposed by the invention, this method is applied to comprise in the network system of a plurality of PE, each PE sets up PW respectively and between the adjacent PE, wherein, comprise at least one UPE and a plurality of NPE among a plurality of PE, UPE respectively and the PW between the adjacent NPE be specially UPW, this method specifically may further comprise the steps:
Whether step S201, each NPE detect each PW that self links to each other according to sense cycle and break down.
When a NPE judges that a PW who self links to each other breaks down, execution in step S202;
When each NPE judges that a PW who self links to each other does not all break down, return step S201.
Whether there is UPW among each PW that step S202, NPE inquiry connects self.
If have UPW among each PW that the NPE inquiry connects self, then execution in step S203;
If do not have UPW among each PW that the NPE inquiry connects self, NPE then abandons handling.
Need further be pointed out that, when a NPE judges that a PW who self links to each other breaks down, comprise that also NPE is changed to down state with the PW that breaks down.
Step S203, NPE send handoff request message by UPW to UPE, make UPE when meeting default switching condition, carry out the switching of UPW.
In concrete application scenarios, the specific implementation process of this step comprises:
UPE judges according to the identification information that carries in the handoff request message whether handoff request message is that NPE sends;
If judged result is for being, UPE judges whether self UPW corresponding with NPE is in state of activation, and whether the pairing backup of UPW UPW is in the lock state;
If UPE judges self UPW corresponding with NPE and be in state of activation, and the pairing backup of UPW UPW is in the lock state, and UPE switches to lock-out state with the UPW of NPE correspondence, and UPW switches to state of activation with the pairing backup of UPW.
By said process, finished the switching of UPW, can further include corresponding recovery flow process afterwards, specify as follows:
NPE detects the PW that breaks down according to sense cycle and whether recovers normal;
Recover just often when NPE judges the PW that breaks down, NPE sends recovery request message by UPW to UPE, wherein, carries the identification information of NPE self in the recovery request message.
Wherein, recover just often, comprise that also NPE will recover normal PW and be changed to upstate when NPE judges the PW that breaks down.
Further, to carry out the flow process that the switching of UPW recovers as follows for the UPE side:
UPE judges according to the identification information that carries in the recovery request message whether recovery request message is that NPE sends;
If judged result is for being, UPE judges whether self UPW corresponding with NPE is in the lock state, and whether the pairing backup of UPW UPW is in state of activation;
If UPE judges self UPW corresponding with NPE and be in the lock state, and the pairing backup of UPW UPW is in the lock state, and UPE judges self whether to have disposed the recoverable mechanism of UPW;
Self disposed the recoverable mechanism of UPW if UPE judges, UPE switches to state of activation with the UPW of NPE correspondence, and UPW switches to lock-out state with the pairing backup of UPW.
Compared with prior art, the present invention has the following advantages:
By using technical scheme of the present invention, timely informing mechanism by network failure, rapidly fault is informed the corresponding network equipment, initiate to switch by this network equipment then, evade the link that defective takes place, make network convergence rapid, thereby, reduce Network Packet Loss, improved the forwarding reliability.
In order further to set forth technological thought of the present invention, existing in conjunction with concrete application scenarios, technical scheme of the present invention is described.
As shown in Figure 3, the schematic flow sheet for the network failure processing method under a kind of concrete scene proposed by the invention specifically may further comprise the steps:
Step S301, when detecting common PW fault in the current VPN (detecting) on the PE equipment by BFD or other related protocols, at first this PW is changed to unavailablely, make flow not transmit toward this PW again.
Step S302, PE travel through all opposite end neighbours of current VPN, and promptly all PW judge whether to exist UPW.
If find to have UPW, then execution in step S303;
If do not find UPW, then abandon handling.
Step S303, NPE structure notice message NeedSwitch, public network PW takes place fault has taken place in notice UPE, needs UPE to initiate masterslave switchover.
The notice message should comprise the LSR-ID of the NPE that initiates this message; Need send NeedSwitch notice message to all UPW.
Step S304, as the notified message NeedSwitch of UPE, judge whether to receive whether the Peer of this message is NPE.
If, execution in step S305 then;
If not, then abandon handling.
Step S305, UPE judge whether the UPW that points to this NPE is the UP state, and whether the backup UPW of this PW is the Block state.
If satisfy above-mentioned condition, execution in step S306 then;
If do not satisfy above-mentioned condition, then abandon handling.
Step S306, UPE initiate to switch, and in time send MAC Address recovery message, make VPN restrain fast.
After this, the private network flow just can normally send and receive;
Step S307, when the NPE Equipment Inspection to before the common PW of fault recover, be changed to this PW available.
Step S308, NPE structure notice message NoDefect, public network PW fault recovery takes place in notice UPE, need UPE can initiate active and standby time and cut, the notice message should comprise the LSR-ID of the NPE that initiates this message, need send NeedSwitch notice message to all UPW.
Step S309, as the notified message NoDefect of UPE, judge whether to receive whether the Peer of this message is NPE.
If, execution in step S310 then;
If not, then abandon handling.
Step S310, UPE judge whether the PW that points to this NPE is the Block state.
If satisfy above-mentioned condition, execution in step S311 then;
If do not satisfy above-mentioned condition, then abandon handling.
Step S311, UPE confirm whether initiate to switch according to configuration (whether can return and cut), reclaim message if need in time to send MAC Address after switching, and make VPN restrain fast.
In conjunction with application scenarios shown in Figure 1, the embodiment of technical scheme proposed by the invention is described as follows:
At the network stabilization state, all list items are all normal, and CE1 is as follows to the idiographic flow that CE3 sends message:
Message is delivered to user-end provider edge, searches private network MAC table, and the address MAC3 study of CE3 is on UPW1, and message sends (because UPW2 is a backup link, being in the Block state at ordinary times, so message can only be transmitted from UPW1) from UPW1; NPE1 receives after this message, searches the MAC table and can find MAC3 study on PW1, and message sends from PW1; After NPE3 receives message, can message be sent to CE3 according to MAC table lookup result.
If detect defective on the PW1, promptly PW1 is unavailable, so,
NPE3 detects after the defective, PW1 is changed to unavailablely on NPE3, and the every other neighbours that search NPE3 find no UPE and link to each other, and no longer do other processing.
NPE1 detects after the defective, NPE1 is gone up PW1 is put not unavailable, searches NPE1 and goes up every other neighbours, finds to have UPE to link to each other, structure notice message NeedSwitch then, and fault has taken place in notice UPE public network PW, needs UPE to initiate masterslave switchover; Need send the notice message to all UPE neighbours; The format of notice message NeedSwitch is as follows, and the LSRID that carries NPE1 after structure is good sends to UPE by LDP.
NeedSitch notice message adopts the TLV coded system of LDP message, and its message format is as follows:
After the notified message NeedSwitch of UPE, parse LSRID and preservation; Find after UPE resolves that LSRID is NPE1, and work at present is on the UPW1 that points to NPE1, the UPW2 state is BLOCK, meets the condition of switching.Therefore, UPE initiates switching of active and standby PW immediately.After the last active and standby PW of UPE switches, initiate the MAC Address reclaimer operation at once simultaneously, make network restrain fast.
So far, make the private network flow be evaded the PW1 that defective takes place, flow is transmitted logical, has reduced a large amount of packet losses, has safeguarded the stable of network.
When the NPE1 Equipment Inspection to before the common PW1 of fault recover, this PW1 is changed to available, search NPE1 and go up every other neighbours, discovery has UPE to link to each other, then structure notice message NoDefect notifies UPE public network PW to withdraw from fault, needs UPE can initiate active and standby time and cuts; Need send the notice message to all UPE neighbours; The format of notice message NoDefect is shown in hypomere, and the LSRID that carries NPE1 after structure is good sends to UPE by LDP.
NoDefect notice message adopts the TLV coded system of LDP message, and its message format is as follows:
After the notified message NoDefect of UPE, parse LSRID and preservation; Find after UPE resolves that LSRID is NPE1, and current UPW1 state is BLOCK, meets the condition of switching.Check whether to have disposed to return then and cut, if configuration is not withdrawed from; If disposed, then carry out cutting for active and standby time; After the last active and standby PW of UPE returns and cuts, initiate the MAC Address reclaimer operation at once simultaneously, make network restrain fast;
Compared with prior art, the present invention has the following advantages:
By using technical scheme of the present invention, timely informing mechanism by network failure, rapidly fault is informed the corresponding network equipment, initiate to switch by this network equipment then, evade the link that defective takes place, make network convergence rapid, thereby, reduce Network Packet Loss, improved the forwarding reliability.
In order to realize technical scheme of the present invention, the invention allows for a kind of PE, be applied to comprise in the network system of a plurality of PE, each PE sets up PW respectively and between the adjacent PE, wherein, comprise at least one UPE and a plurality of NPE among a plurality of PE, UPE respectively and the PW between the adjacent NPE be specially UPW, its structural representation specifically comprises as shown in Figure 4:
Preferably, module 41 is set also to be used for when detection module 42 judges that a PW who self links to each other breaks down, the PW that breaks down is changed to down state, or judges the PW that breaks down when detection module 42 and recover just often, will recover normal PW and be changed to upstate.
Preferably, PE also comprises:
Compared with prior art, the present invention has the following advantages:
By using technical scheme of the present invention, timely informing mechanism by network failure, rapidly fault is informed the corresponding network equipment, initiate to switch by this network equipment then, evade the link that defective takes place, make network convergence rapid, thereby, reduce Network Packet Loss, improved the forwarding reliability.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by hardware, also can realize by the mode that software adds necessary general hardware platform.Based on such understanding, technical scheme of the present invention can embody with the form of software product, it (can be CD-ROM that this software product can be stored in a non-volatile memory medium, USB flash disk, portable hard drive etc.) in, comprise some instructions with so that computer equipment (can be personal computer, server, the perhaps network equipment etc.) each implements the described method of scene to carry out the present invention.
It will be appreciated by those skilled in the art that accompanying drawing is a preferred schematic diagram of implementing scene, module in the accompanying drawing or flow process might not be that enforcement the present invention is necessary.
It will be appreciated by those skilled in the art that the module in the device of implementing in the scene can be distributed in the device of implementing scene according to implementing scene description, also can carry out respective change and be arranged in the one or more devices that are different from this enforcement scene.The module of above-mentioned enforcement scene can be merged into a module, also can further split into a plurality of submodules.
The invention described above sequence number is not represented the quality of implementing scene just to description.
More than disclosed only be several concrete enforcement scene of the present invention, still, the present invention is not limited thereto, any those skilled in the art can think variation all should fall into protection scope of the present invention.
Claims (10)
1. network failure processing method, be applied to comprise in the network system of a plurality of provider edge equipment PE, each PE sets up the empty PW that links respectively with between the adjacent PE, wherein, the provider edge equipment NPE that comprises at least one user oriented provider edge equipment UPE and a plurality of network-orienteds among described a plurality of PE, described UPE respectively with adjacent NPE between PW be specially user oriented void and link UPW, it is characterized in that, whether each described NPE detects each PW that self links to each other according to sense cycle and breaks down, and described method specifically may further comprise the steps:
When a NPE judges that a PW who self links to each other breaks down, whether there is UPW among each PW that described NPE inquiry connects self;
If have UPW among each PW that described NPE inquiry connects self, then send handoff request message to described UPE, make described UPE when meeting default switching condition, carry out the switching of UPW by described UPW, wherein, carry the identification information of described NPE self in the described handoff request message.
2. the method for claim 1 is characterized in that, when a NPE judges that a PW who self links to each other breaks down, also comprises:
The described PW that described NPE will break down is changed to down state.
3. the method for claim 1 is characterized in that, whether has UPW among each PW that described NPE inquiry connects self, also comprises:
If do not have UPW among each PW that described NPE inquiry connects self, described NPE then abandons handling.
4. the method for claim 1 is characterized in that, described NPE sends handoff request message by described UPW to described UPE, makes described UPE when meeting default switching condition, carries out the switching of UPW, specifically comprises:
Described UPE judges according to the described identification information that carries in the described handoff request message whether described handoff request message is that NPE sends;
If judged result is for being, described UPE judges whether self UPW corresponding with described NPE is in state of activation, and whether the pairing backup of described UPW UPW is in the lock state;
If described UPE judgement self UPW corresponding with described NPE is in state of activation, and the pairing backup of described UPW UPW is in the lock state, described UPE switches to lock-out state with the UPW of described NPE correspondence, and UPW switches to state of activation with the pairing backup of described UPW.
5. the method for claim 1 is characterized in that, described NPE sends handoff request message by described UPW to described UPE, makes described UPE when meeting default switching condition, carries out also comprising after the switching of UPW:
Described NPE detects the described PW that breaks down according to sense cycle and whether recovers normal;
When judging the described PW that breaks down, recovers just often described NPE, described NPE sends recovery request message by described UPW to described UPE, make described UPE when meeting default recovery condition, the switching of carrying out UPW recovers, wherein, carry the identification information of described NPE self in the described recovery request message.
6. method as claimed in claim 5 is characterized in that, recovers just often when described NPE judges the described PW that breaks down, and also comprises:
Described NPE will recover normal described PW and be changed to upstate.
7. method as claimed in claim 5 is characterized in that, described NPE sends recovery request message by described UPW to described UPE, makes described UPE when meeting default recovery condition, and the switching of carrying out UPW recovers, and specifically comprises:
Described UPE judges according to the described identification information that carries in the described recovery request message whether described recovery request message is that NPE sends;
If judged result is for being, described UPE judges whether self UPW corresponding with described NPE is in the lock state, and whether the pairing backup of described UPW UPW is in state of activation;
If described UPE judges self UPW corresponding with described NPE and be in the lock state, and the pairing backup of described UPW UPW is in the lock state, and described UPE judges self whether to have disposed the recoverable mechanism of UPW;
Self disposed the recoverable mechanism of UPW if described UPE judges, described UPE switches to state of activation with the UPW of described NPE correspondence, and UPW switches to lock-out state with the pairing backup of described UPW.
8. a PE is applied to comprise that each PE sets up PW respectively and between the adjacent PE in the network system of a plurality of PE, wherein, comprise at least one UPE and a plurality of NPE among described a plurality of PE, described UPE respectively and the PW between the adjacent NPE be specially UPW, it is characterized in that, comprising:
Module is set, is used to be provided with sense cycle;
Detection module, be connected and be used at described PE during with the described module that is provided with as NPE, whether break down according to described each the continuous PW of the set sense cycle detection of module self that is provided with, or whether recover normal according to the described set described PW that breaks down of sense cycle detection of module that is provided with;
Enquiry module with described detection module, is used at described PE as NPE, and described detection module judges the PW that a PW self linking to each other breaks down or breaks down recovers just often, inquires about among each PW that self connects whether have UPW;
Processing module, be connected with described enquiry module, be used at described PE as NPE, and when having UPW among each PW that described enquiry module inquiry connects self, send handoff request message or recovery request message by described UPW to described UPE, make described UPE when meeting the default switching condition or the condition of recovery, carry out the switching of UPW or switch recovering, wherein, carry the identification information of described NPE self in described handoff request message or the recovery request message.
9. PE as claimed in claim 8, it is characterized in that, the described module that is provided with also is connected with described detection module, be used for when described detection module judges that a PW who self links to each other breaks down, the described PW that breaks down is changed to down state, or judge the PW that breaks down when described detection module and recover just often, will recover normal described PW and be changed to upstate.
10. PE as claimed in claim 8 is characterized in that, also comprises:
Receiver module when described PE starts during as UPE, is used to receive handoff request message or the recovery request message that NPE sends by UPW;
Judge module, be connected with described receiver module, when described PE starts during as UPE, be used for the described identification information that carries according to the received handoff request message of described receiver module or recovery request message, judge whether described handoff request message or recovery request message are that NPE sends, if judged result is for being the further current state of judging UPW corresponding with described NPE and the pairing backup of described UPW UPW of described judge module;
Described processing module, be connected with described judge module with described receiver module, also be used for receiving handoff request message when described receiver module, and described judge module judges that the UPW corresponding with described NPE is in state of activation, when the pairing backup of described UPW UPW is in the lock state, the UPW of described NPE correspondence is switched to lock-out state, UPW switches to state of activation with the pairing backup of described UPW, or receive recovery request message when described receiver module, and described judge module judges that the UPW corresponding with described NPE is in the lock state, when the pairing backup of described UPW UPW is in state of activation, notify described judge module to judge whether described PE has disposed the recoverable mechanism of UPW, if judged result is for being, described processing module switches to state of activation with the UPW of described NPE correspondence, and UPW switches to lock-out state with the pairing backup of described UPW.
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