CN105656651A - Method and device for deleting graceful restart (GR) function - Google Patents

Method and device for deleting graceful restart (GR) function Download PDF

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Publication number
CN105656651A
CN105656651A CN201410642079.8A CN201410642079A CN105656651A CN 105656651 A CN105656651 A CN 105656651A CN 201410642079 A CN201410642079 A CN 201410642079A CN 105656651 A CN105656651 A CN 105656651A
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equipment
information
deleted
notification message
session
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CN201410642079.8A
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CN105656651B (en
Inventor
刘闯
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ZTE Corp
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ZTE Corp
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Priority to CN201410642079.8A priority Critical patent/CN105656651B/en
Priority to PCT/CN2015/072933 priority patent/WO2016074367A1/en
Publication of CN105656651A publication Critical patent/CN105656651A/en
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00Routing or path finding of packets in data switching networks
    • H04L45/50Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]
    • H04L45/507Label distribution
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00Routing or path finding of packets in data switching networks
    • H04L45/50Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]

Abstract

The invention discloses a method for deleting a graceful restart (GR) function. The method comprises the steps of locally deleting the configuration information of the GR of a first device and GR information in a label distribution protocol (LDP) session of the first device through establishing the LDP session and negotiating the GR function with a second device; and sending a notice message to the second device, wherein the notice message is used for informing the second device to delete the GR information in the LDP session of the second device, thus the second device locally deletes the GR information in the LDP session according to the notice message. The invention also discloses a device, thus under the premise of not influencing the LDP session state, after the LSR locally deletes the support for the GR, the corresponding LDP session with the enabled GR can be disabled in time.

Description

Delete the method and apparatus of GR function
Technical field
The present invention relates to data network communications field, particularly relate to a kind of method and apparatus deleting GR function.
Background technology
Multiprotocol label switching (MultiprotocolLabelSwitching, MPLS) it is the mainstream technology of current data network communication field, it is according to asynchronous transfer mode (asynchronoustransfermode at first, ATM) principle of cell switching, proposes to improve the forwarding speed of message. One of signaling protocol that tag distribution protocol (LabelDistributionProtocol, LDP) is MPLS, the foundation maintenance generating maintenance, the distribution of label, LSP etc. being responsible for FEC operates. RFC5036 (LDP agreement behavioral standard) describes the agreement behavior of LDP, it by generating the FEC of correspondence and distributing label to the mapping of routing iinformation, by at LSR (LabelSwitchedRouter, refer to the equipment supporting Tag switching, such as router, switch etc., it runs label signaling protocol just like LDP) between set up LDP session and carry out advertisement label and form LSP, thus realizing the Tag switching of data message on network.
Raising along with the requirement to network reliability, it is necessary to ensure that flow is continuous in device fails or when restarting. Smooth restarting (GracefulRestart) technology is introduced in LDP, RFC3478 (LDPGR mechanism standard) describes LDPGR mechanism, GR is based on a certain session, restarting equipment is served as and is restarted corner color (Restarter), its neighbours serve as auxiliary square (Helper), for a certain equipment, its role does not fix.
But conversation-based GR function needs both sides in session establishment process to consult GR energy and GR time parameter, describe according to RFC3478, LDP initial message carries optional parameters FaultTolerant (FT) SessionTLV, wherein L flag bit is that GR ability is supported in 1 expression, and two parameters of FTReconnectTimeout and the RecoveryTime carried are for consulting two timer values of GR process. Therefore, after session establishment, the GR ability in this session is not just subject to have impact on of LSR this locality GR feature operation.
In actual applications, LSR to the support of GR probably due to local device ability (as the tenability of label forwarding is changed by mini-plant) needs to cancel, like this exist for contradiction, if needing local GR to support to be applied at once in session, being necessary for restarting session, this will make the interruption of existing business in this session.
Summary of the invention
The present invention provides a kind of method and apparatus deleting GR function, and main purpose is in that to solve how to make LSR this locality delete the support to GR and the technical problem of notice opposite end deletion GR function under the premise not affecting LDP session status.
For achieving the above object, a kind of method deleting GR function provided by the invention, described method includes:
GR information when setting up LDP session with the second equipment and consult GR function, in the local configuration information of GR deleting described first equipment and the described LDP session of described first equipment;
To described second equipment dispatch order message, described notification message is for notifying that described second equipment deletes the GR information in the described LDP session of described second equipment, so that described second equipment deletes the GR information in described LDP session according to described notification message this locality.
Preferably, described to described second equipment dispatch order message, including:
The optional parameters of described notification message carries the extended mode TLV of " delete GR function ", the U-bit of described extended mode TLV is set to 1, F-bit be set to 0, E-bit be set to 0 and F-bit be set to 0;
Notification message after arranging is sent to described second equipment.
Preferably, described after described second equipment dispatch order message, also include:
Judging whether described first equipment has GR information to be deleted, if having, then deleting the forwarding-table item relevant to described GR information to be deleted in the forwarding face of described first equipment.
For achieving the above object, the present invention also provides for a kind of method deleting GR function, and described method includes:
Receiving the notification message that described first equipment sends, described notification message is for notifying that described second equipment deletes the GR information in the described LDP session of described second equipment;
The GR information in the LDP session of the second equipment is deleted according to described notification message.
Preferably, after the GR information in the described LDP session deleting the second equipment according to described notification message, also include:
Judge whether described second equipment has GR information to be deleted, if having, then delete the FEC label binding information relevant to described GR information to be deleted of described second equipment, and notify that the session entry relevant to described GR information to be deleted is deleted in the forwarding face of described second equipment, and close described GR label recovery intervalometer.
For achieving the above object, a kind of equipment provided by the invention, described equipment includes:
First deletes unit, for the GR information when setting up LDP session with the second equipment and consult GR function, in the local configuration information of GR deleting described first equipment and the described LDP session of described first equipment;
Transmitting element, for to described second equipment dispatch order message, described notification message is for notifying that described second equipment deletes the GR information in the described LDP session of described second equipment, so that described second equipment deletes the GR information in described LDP session according to described notification message this locality.
Preferably, described transmitting element, it is used for:
The optional parameters of described notification message carries the extended mode TLV of " delete GR function ", the U-bit of described extended mode TLV is set to 1, F-bit be set to 0, E-bit be set to 0 and F-bit be set to 0;
Notification message after arranging is sent to described second equipment.
Preferably, described equipment also includes:
First judging unit, for judging whether described first equipment has GR information to be deleted;
Second deletes unit, if for judging that described first equipment has GR information to be deleted, then deleting the forwarding-table item relevant to described GR information to be deleted in the forwarding face of described first equipment.
Preferably, described equipment also includes:
Receiving unit, for the notification message that described first equipment sends, described notification message is for notifying that described second equipment deletes the GR information in the described LDP session of described second equipment;
3rd deletes unit, is used for the GR information deleting in the LDP session of the second equipment according to described notification message.
Preferably, described equipment also includes:
Second judging unit, is additionally operable to judge whether described second equipment has GR information to be deleted;
4th deletes unit, if being additionally operable to judge that described second equipment has GR information to be deleted, then delete the FEC label binding information relevant to described GR information to be deleted of described second equipment, and notify that the session entry relevant to described GR information to be deleted is deleted in the forwarding face of described second equipment, and close described GR label recovery intervalometer.
The embodiment of the present invention is by the GR information when setting up LDP session with the second equipment and consult GR function, in the local configuration information of GR deleting described first equipment and the described LDP session of described first equipment; To described second equipment dispatch order message, described notification message is for notifying that described second equipment deletes the GR information in the described LDP session of described second equipment, so that described second equipment deletes the GR information in described LDP session according to described notification message this locality, thus realizing under the premise not affecting LDP session status, LSR this locality is deleted after the support of GR, and the corresponding LDP session enabling GR can go to enable in time.
Accompanying drawing explanation
The system architecture diagram of a kind of GR application networking that Fig. 1 provides for prior art;
Fig. 2 is the schematic flow sheet that the present invention deletes the method first embodiment of GR function;
Fig. 3 is the schematic flow sheet that the present invention deletes method second embodiment of GR function;
Fig. 4 is the schematic flow sheet that the present invention deletes method the 3rd embodiment of GR function;
Fig. 5 is the schematic flow sheet that the present invention deletes method the 4th embodiment of GR function;
Fig. 6 is the high-level schematic functional block diagram of present device first embodiment;
Fig. 7 is the high-level schematic functional block diagram of present device the second embodiment;
Fig. 8 is the high-level schematic functional block diagram of present device the 3rd embodiment;
Fig. 9 is the high-level schematic functional block diagram of present device the 4th embodiment.
The realization of the object of the invention, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Detailed description of the invention
Should be appreciated that specific embodiment described herein is only in order to explain the present invention, is not intended to limit the present invention.
System architecture diagram with reference to a kind of GR application networking that Fig. 1, Fig. 1 provide for prior art.
Concrete, as it is shown in figure 1, each node enables GR in mpls domain. Before P1 node is restarted, flow trend is CE1-> PE1-> P1-> P2-> PE2-> CE2. After P1 node is restarted, entering GRRestarter role, forwarding-table item temporarily keeps, its adjacent LDP neighbours PE1 and P2 is as GR auxiliary square, wouldn't updating forwarding-table item, whole mpls domain LSP will not change, and flow is still according to CE1-> PE1-> P1-> P2-> PE2-> CE2 carries out. During GR, rebuilding session, switch label between PE1 and P1, between P1 and P2, PE1, P1, P2 list item is recovered, and whole restarting process forwards without influence on flow.
The present invention provides a kind of method deleting GR function.
It is the schematic flow sheet that the present invention deletes the method first embodiment of GR function with reference to Fig. 2, Fig. 2.
In the first embodiment, the method for this deletion GR function includes:
Step 201, the GR information when setting up LDP session with the second equipment and consult GR function, in the local configuration information of GR deleting described first equipment and the described LDP session of described first equipment;
Concrete, P1 this locality receives GR configuration and deletes, and processes the GR relevant information that this locality keeps. P1 travels through local session table, checks whether use GR function in session, if PE1 and P1, P1 and P2 session is used in both GR function. P1 deletes the GR function in this session, the GR time parameter consulted before removing.
Step 202, to described second equipment dispatch order message, described notification message is for notifying that described second equipment deletes the GR information in the described LDP session of described second equipment, so that described second equipment deletes the GR information in described LDP session according to described notification message this locality.
Preferably, described to described second equipment dispatch order message, including:
The optional parameters of LDP notification message carries the extended mode TLV of " delete GR function ", the U-bit of described extended mode TLV is set to 1, F-bit be set to 0, E-bit be set to 0 and F-bit be set to 0;
Notification message after arranging is sent to described second equipment.
Concrete, P1 sends " deleting GR function " notice to PE1 and P2 respectively, and notification message can be the LDP notification message of definition in RFC5036, carries " deleting GR function " extended mode TLV in the optional parameters of this message. The U-bit of the extended mode TLV structure that the present invention is defined needs to be set to 1, F-bit and needs to be set to 0, and the E-bit of extended mode value needs to be set to 0, F-bit to be needed to be set to 0. Through aforesaid operations, local LSR remove just can when session is not removed practical function, the LDP session between LSR no longer possesses GR ability.
The embodiment of the present invention is by the GR information when setting up LDP session with the second equipment and consult GR function, in the local configuration information of GR deleting described first equipment and the described LDP session of described first equipment; To described second equipment dispatch order message, described notification message is for notifying that described second equipment deletes the GR information in the described LDP session of described second equipment, so that described second equipment deletes the GR information in described LDP session according to described notification message this locality, thus realizing under the premise not affecting LDP session status, LSR this locality is deleted after the support of GR, and the corresponding LDP session enabling GR can go to enable in time.
It is the schematic flow sheet that the present invention deletes method second embodiment of GR function with reference to Fig. 3, Fig. 3.
In a second embodiment, also include after step 202:
Step 203, it is judged that whether described first equipment has GR information to be deleted, if having, then deletes the forwarding-table item relevant to described GR information to be deleted in the forwarding face of described first equipment.
Concrete, P1 judges whether this locality has and is in the aging entry of GR. When GR configuration is deleted, if current device is in restarts corner color, then forward face can there is forwarding-table item to be aging. If being in auxiliary square role, then chain of command remains with FEC label binding information table to be aging.
Restarting corner color if be in, then delete forwarding-table item immediately, if being in auxiliary square role, then deleting FEC label binding information and notice forwarding face immediately.
After deleting GR configuration, P1 equipment is when restarting, and after P1 equipment chain of command is restarted, all erasings of information of chain of command, forwarding face perceives after chain of command restarts, and owing to GR configuration is deleted, forwarding-table item is deleted immediately, is no longer waiting for aging.
Through aforesaid operations, local LSR remove just can when session is not removed practical function, LDP session between LSR no longer possesses GR ability, when a restart is occurring, both sides LSR enters normal LDP convergence process, avoid enter into the smooth restarting of mistake, causing unnecessary flow to forward thus solving will there is the maintenance because of unnecessary label forwarding list item when controlling plane and restarting, even can cause flow black hole.
The present invention provides a kind of method deleting GR function.
It is the schematic flow sheet that the present invention deletes method the 3rd embodiment of GR function with reference to Fig. 4, Fig. 4.
In the third embodiment, the method for this deletion GR function includes:
Step 401, receives the notification message that described first equipment sends, and described notification message is for notifying that described second equipment deletes the GR information in the described LDP session of described second equipment;
Step 402, deletes the GR information in the LDP session of the second equipment according to described notification message.
Concrete, PE1 or P2 receives " deleting GR function " notice that neighbours send, PE1 or P2 checks the session corresponding with these neighbours, if GR enables in session, then deletes the GR function in this session, the GR time parameter consulted before removing.
The embodiment of the present invention is by the GR information when setting up LDP session with the second equipment and consult GR function, in the local configuration information of GR deleting described first equipment and the described LDP session of described first equipment; To described second equipment dispatch order message, described notification message is for notifying that described second equipment deletes the GR information in the described LDP session of described second equipment, so that described second equipment deletes the GR information in described LDP session according to described notification message this locality, thus realizing under the premise not affecting LDP session status, LSR this locality is deleted after the support of GR, and the corresponding LDP session enabling GR can go to enable in time.
It is the schematic flow sheet that the present invention deletes method the 4th embodiment of GR function with reference to Fig. 5, Fig. 5.
In the fourth embodiment, also include after step 402:
Step 403, judge whether described second equipment has GR information to be deleted, if having, then delete the FEC label binding information relevant to described GR information to be deleted of described second equipment, and notify that the session entry relevant to described GR information to be deleted is deleted in the forwarding face of described second equipment, and close described GR label recovery intervalometer.
Concrete, checking whether session is currently in GR label Restoration stage, be in aging FEC label binding information to be restored if it is, delete, list item is deleted in notice forwarding face, closes label and recovers intervalometer.
When after receiving " deleting GR function " notification message, PE1 or P2 perceives session chain rupture, GR ability has been deleted after session receives " deleting GR function " notification message, after perceiving session chain rupture, chain of command is deleted this session and is received FEC label binding information, and notify forwarding face, forwarding face receives the list item of chain of command and deletes notice, deletes forwarding entry.
Through aforesaid operations, local LSR remove just can when session is not removed practical function, LDP session between LSR no longer possesses GR ability, when a restart is occurring, both sides LSR enters normal LDP convergence process, avoid enter into the smooth restarting of mistake, causing unnecessary flow to forward thus solving will there is the maintenance because of unnecessary label forwarding list item when controlling plane and restarting, even can cause flow black hole.
The present invention provides a kind of equipment.
With reference to the high-level schematic functional block diagram that Fig. 6, Fig. 6 are present device first embodiment.
In the first embodiment, this equipment includes:
First deletes unit 601, for the GR information when setting up LDP session with the second equipment and consult GR function, in the local configuration information of GR deleting described first equipment and the described LDP session of described first equipment;
Concrete, P1 this locality receives GR configuration and deletes, and processes the GR relevant information that this locality keeps. P1 travels through local session table, checks whether use GR function in session, if PE1 and P1, P1 and P2 session is used in both GR function. P1 deletes the GR function in this session, the GR time parameter consulted before removing.
Transmitting element 602, for to described second equipment dispatch order message, described notification message is for notifying that described second equipment deletes the GR information in the described LDP session of described second equipment, so that described second equipment deletes the GR information in described LDP session according to described notification message this locality.
Preferably, described transmitting element 602, it is used for:
The optional parameters of described notification message carries the extended mode TLV of " delete GR function ", the U-bit of described extended mode TLV is set to 1, F-bit be set to 0, E-bit be set to 0 and F-bit be set to 0;
Notification message after arranging is sent to described second equipment.
Concrete, P1 sends " deleting GR function " notice to PE1 and P2 respectively, and notification message can be the LDP notification message of definition in RFC5036, carries " deleting GR function " extended mode TLV in the optional parameters of this message. The U-bit of the extended mode TLV structure that the present invention is defined needs to be set to 1, F-bit and needs to be set to 0, and the E-bit of extended mode value needs to be set to 0, F-bit to be needed to be set to 0. Through aforesaid operations, local LSR remove just can when session is not removed practical function, the LDP session between LSR no longer possesses GR ability.
The embodiment of the present invention is by the GR information when setting up LDP session with the second equipment and consult GR function, in the local configuration information of GR deleting described first equipment and the described LDP session of described first equipment; To described second equipment dispatch order message, described notification message is for notifying that described second equipment deletes the GR information in the described LDP session of described second equipment, so that described second equipment deletes the GR information in described LDP session according to described notification message this locality, thus realizing under the premise not affecting LDP session status, LSR this locality is deleted after the support of GR, and the corresponding LDP session enabling GR can go to enable in time.
With reference to the high-level schematic functional block diagram that Fig. 7, Fig. 7 are present device the second embodiment.
In a second embodiment, this equipment also includes:
First judging unit 603, for judging whether described first equipment has GR information to be deleted;
Second deletes unit 604, if for judging that described first equipment has GR information to be deleted, then deleting the forwarding-table item relevant to described GR information to be deleted in the forwarding face of described first equipment.
Concrete, P1 judges whether this locality has and is in the aging entry of GR. When GR configuration is deleted, if current device is in restarts corner color, then forward face can there is forwarding-table item to be aging. If being in auxiliary square role, then chain of command remains with FEC label binding information table to be aging.
Restarting corner color if be in, then delete forwarding-table item immediately, if being in auxiliary square role, then deleting FEC label binding information and notice forwarding face immediately.
After deleting GR configuration, P1 equipment is when restarting, and after P1 equipment chain of command is restarted, all erasings of information of chain of command, forwarding face perceives after chain of command restarts, and owing to GR configuration is deleted, forwarding-table item is deleted immediately, is no longer waiting for aging.
Through aforesaid operations, local LSR remove just can when session is not removed practical function, LDP session between LSR no longer possesses GR ability, when a restart is occurring, both sides LSR enters normal LDP convergence process, avoid enter into the smooth restarting of mistake, causing unnecessary flow to forward thus solving will there is the maintenance because of unnecessary label forwarding list item when controlling plane and restarting, even can cause flow black hole.
With reference to the high-level schematic functional block diagram that Fig. 8, Fig. 8 are present device the 3rd embodiment.
In the third embodiment, this equipment also includes:
Receiving unit 605, for the notification message that described first equipment sends, described notification message is for notifying that described second equipment deletes the GR information in the described LDP session of described second equipment;
3rd deletes unit 606, is used for the GR information deleting in the LDP session of the second equipment according to described notification message.
Concrete, PE1 or P2 receives " deleting GR function " notice that neighbours send, PE1 or P2 checks the session corresponding with these neighbours, if GR enables in session, then deletes the GR function in this session, the GR time parameter consulted before removing.
The embodiment of the present invention is by the GR information when setting up LDP session with the second equipment and consult GR function, in the local configuration information of GR deleting described first equipment and the described LDP session of described first equipment; To described second equipment dispatch order message, described notification message is for notifying that described second equipment deletes the GR information in the described LDP session of described second equipment, so that described second equipment deletes the GR information in described LDP session according to described notification message this locality, thus realizing under the premise not affecting LDP session status, LSR this locality is deleted after the support of GR, and the corresponding LDP session enabling GR can go to enable in time.
With reference to the high-level schematic functional block diagram that Fig. 9, Fig. 9 are present device the 4th embodiment.
In the fourth embodiment, this equipment also includes:
Second judging unit 607, is additionally operable to judge whether described second equipment has GR information to be deleted;
4th deletes unit 608, if being additionally operable to judge that described second equipment has GR information to be deleted, then delete the FEC label binding information relevant to described GR information to be deleted of described second equipment, and notify that the session entry relevant to described GR information to be deleted is deleted in the forwarding face of described second equipment, and close described GR label recovery intervalometer.
Concrete, checking whether session is currently in GR label Restoration stage, be in aging FEC label binding information to be restored if it is, delete, list item is deleted in notice forwarding face, closes label and recovers intervalometer.
When after receiving " deleting GR function " notification message, PE1 or P2 perceives session chain rupture, GR ability has been deleted after session receives " deleting GR function " notification message, after perceiving session chain rupture, chain of command is deleted this session and is received FEC label binding information, and notify forwarding face, forwarding face receives the list item of chain of command and deletes notice, deletes forwarding entry.
Through aforesaid operations, local LSR remove just can when session is not removed practical function, LDP session between LSR no longer possesses GR ability, when a restart is occurring, both sides LSR enters normal LDP convergence process, avoid enter into the smooth restarting of mistake, causing unnecessary flow to forward thus solving will there is the maintenance because of unnecessary label forwarding list item when controlling plane and restarting, even can cause flow black hole.
These are only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every equivalent structure utilizing description of the present invention and accompanying drawing content to make or equivalence flow process conversion; or directly or indirectly it is used in other relevant technical fields, all in like manner include in the scope of patent protection of the present invention.

Claims (10)

1. the method deleting GR function, it is characterised in that described method includes:
First equipment GR information when setting up LDP session with the second equipment and consult GR function, in the local configuration information of GR deleting described first equipment and the described LDP session of described first equipment;
To described second equipment dispatch order message, described notification message is for notifying that described second equipment deletes the GR information in the described LDP session of described second equipment, so that described second equipment deletes the GR information in described LDP session according to described notification message this locality.
2. method according to claim 1, it is characterised in that described to described second equipment dispatch order message, including:
The optional parameters of described notification message carries the extended mode TLV of " delete GR function ", the U-bit of described extended mode TLV is set to 1, F-bit be set to 0, E-bit be set to 0 and F-bit be set to 0;
Notification message after arranging is sent to described second equipment.
3. method according to claim 1 and 2, it is characterised in that described after described second equipment dispatch order message, also includes:
Judging whether described first equipment has GR information to be deleted, if having, then deleting the forwarding-table item relevant to described GR information to be deleted in the forwarding face of described first equipment.
4. the method deleting GR function, it is characterised in that described method includes:
Receiving the notification message that described first equipment sends, described notification message is for notifying that described second equipment deletes the GR information in the described LDP session of described second equipment;
The GR information in the LDP session of the second equipment is deleted according to described notification message.
5. method according to claim 5, it is characterised in that after the GR information in the described LDP session deleting the second equipment according to described notification message, also include:
Judge whether described second equipment has GR information to be deleted, if having, then delete the FEC label binding information relevant to described GR information to be deleted of described second equipment, and notify that the session entry relevant to described GR information to be deleted is deleted in the forwarding face of described second equipment, and close described GR label recovery intervalometer.
6. an equipment, it is characterised in that described equipment includes:
First deletes unit, for the GR information when setting up LDP session with the second equipment and consult GR function, in the local configuration information of GR deleting described first equipment and the described LDP session of described first equipment;
Transmitting element, for to described second equipment dispatch order message, described notification message is for notifying that described second equipment deletes the GR information in the described LDP session of described second equipment, so that described second equipment deletes the GR information in described LDP session according to described notification message this locality.
7. equipment according to claim 6, it is characterised in that described transmitting element, is used for:
The optional parameters of described notification message carries the extended mode TLV of " delete GR function ", the U-bit of described extended mode TLV is set to 1, F-bit be set to 0, E-bit be set to 0 and F-bit be set to 0;
Notification message after arranging is sent to described second equipment.
8. the equipment according to claim 6 or 7, it is characterised in that described equipment also includes:
First judging unit, for judging whether described first equipment has GR information to be deleted;
Second deletes unit, if for judging that described first equipment has GR information to be deleted, then deleting the forwarding-table item relevant to described GR information to be deleted in the forwarding face of described first equipment.
9. equipment according to claim 8, it is characterised in that described equipment also includes:
Receiving unit, for the notification message that described first equipment sends, described notification message is for notifying that described second equipment deletes the GR information in the described LDP session of described second equipment;
3rd deletes unit, is used for the GR information deleting in the LDP session of the second equipment according to described notification message.
10. equipment according to claim 9, it is characterised in that described equipment also includes:
Second judging unit, is additionally operable to judge whether described second equipment has GR information to be deleted;
4th deletes unit, if being additionally operable to judge that described second equipment has GR information to be deleted, then delete the FEC label binding information relevant to described GR information to be deleted of described second equipment, and notify that the session entry relevant to described GR information to be deleted is deleted in the forwarding face of described second equipment, and close described GR label recovery intervalometer.
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