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Smoothing restarting method and neighbor devices

A neighbor device, graceful restart technology, applied in the field of data communication, can solve the problem of mistaken deletion of forwarding entries, process confusion, reducing GR effectiveness, etc., to avoid traffic interruption, improve effectiveness, and eliminate processing blind spots.

Active Publication Date: 2007-12-26
NEW H3C TECH CO LTD
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AI Technical Summary

Problems solved by technology

In this case, if neighboring device B does not retain MPLS forwarding entries due to network abnormalities, the traffic will be interrupted, which will reduce the effectiveness of GR; and if neighboring device B continues to retain MPLS forwarding entries, then the session During the reconstruction process, the Reconnect timer should be enabled, and the Recovery timer should be enabled after receiving the initialization message, and the Recovery timer for the previous session reconstruction has also been started. There are two Recovery timers at the same time, which will cause confusion in the LDPGR process. If the duration of the GR process is determined based on the Recovery timer of the previous session reconstruction, the GR process will end prematurely, which may cause the forwarding entry to be deleted by mistake, thereby reducing the effectiveness of GR.

Method used

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  • Smoothing restarting method and neighbor devices
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  • Smoothing restarting method and neighbor devices

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Embodiment Construction

[0045] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0046] FIG. 3 is a flow chart of performing LDP GR provided by an embodiment of the present invention. As shown in FIG. 3 , the specific steps are as follows:

[0047] Step 301: The active / standby switchover of the device A occurs, that is, the LDP session with the neighbor device B is disconnected when switching from the active board to the standby board.

[0048] Step 302: The neighbor device B detects that the LDP session with the device A is disconnected, determines that the device A is restarted, the neighbor device B enters the GR state, and starts a Reconnect timer at the same time.

[0049] The timing duration of the Reconnect timer is the smaller of the Reconnect Timeout carried in the initialization message sent by device A to neighbor device B and the local Neighbor Liveness Timeout when device A establishes an LDP session ...

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Abstract

When the neighbor device tests and finds that the conversation with restart device is broken, the reconnect timer (RT) is started. When the neighbor device tests and finds that it is under the Operational state and RT is not overtime, RT is shut and a recovery timer is started. The neighbor device and the restarting device begin to recover the transferring items, used for keeping the flux. This invention prevents the flux from interrupting in the GR process. It also avoids the concurrence of several Recovery timers. All this raises the GR effectivity.

Description

technical field [0001] The invention relates to the technical field of data communication, in particular to a smooth restart method and neighbor equipment. Background technique [0002] Graceful restart (GR, Graceful Restart) refers to ensuring normal data forwarding and uninterrupted key services when the protocol is restarted. GR technology is a kind of high reliability technology. GR is a redundant fault-tolerant technology, which has been widely used in active-standby switchover and system upgrade to ensure uninterrupted forwarding of key services. [0003] Currently, multiprotocol label switching (MPLS) protocols supporting GR include: label distribution protocol (LDP) and resource reservation protocol (RSVP). When the two protocols support GR, parameters related to GR are added in the initialization message of the protocol, and these parameters are exchanged when establishing a session between routers to help GR. [0004] Taking LDP as an example, the existing LDP G...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/22H04L29/06
Inventor 杨霞雷昭燕刘小龙
Owner NEW H3C TECH CO LTD
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