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Device and method for synchronizing label distribution protocol and interior gateway protocol

An internal gateway protocol and label distribution protocol technology, applied in the field of communication, can solve problems such as interruption of MPLS message forwarding, and achieve the effect of avoiding interruption of message forwarding and complete synchronization

Active Publication Date: 2017-06-06
NEW H3C TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After a link is restored, the IGP advertises the normal cost of the link and uses the link, but at this time the LDP LSP on the link has not been established, or when the LDP on the link After the session fails, IGP continues to use this link. If the LDP and IGP are not synchronized, the forwarding of MPLS packets will be interrupted.

Method used

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  • Device and method for synchronizing label distribution protocol and interior gateway protocol
  • Device and method for synchronizing label distribution protocol and interior gateway protocol
  • Device and method for synchronizing label distribution protocol and interior gateway protocol

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Embodiment Construction

[0028] In order to solve the above-mentioned problem of interruption of MPLS packet forwarding caused by LDP and IGP out of synchronization, the current method is to enable the LDP and IGP synchronization function. Specifically, when the LDP session has not been established, the IGP advertises the maximum cost value for the link of the LDP session, so that this link is visible in the IGP topology, but before the LDP session is established, this link is not selected for communication . Only after the establishment of the LDP session is completed, the IGP will advertise the normal cost value for this link. In some special cases, such as: the label distribution control mode of LDP is sequential mode, LDP protocol restart or switchover, etc., an appropriate delay time is usually configured, that is, after the LDP session is established, after waiting for the delay time, Then notify the IGP to minimize the interruption time of MPLS traffic forwarding.

[0029] Please refer to fi...

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Abstract

The invention provides a device and method for synchronizing label distribution protocol and interior gateway protocol. The method includes: when the device has multiple LDP neighbors connected to a single link, respectively establishing a binding relationship group for multiple neighbors on the single link, and the initial value of the binding relationship group is 0; Other routing and forwarding devices in the network announce the cost values ​​from the device to the multiple LDP neighbors, the cost values ​​include the single link cost value and the cost value of the binding relationship group corresponding to the LDP neighbor; calculate the cost value from the device to the LDP neighbor For the cost values ​​of multiple LDP neighbors, the cost value to each of the multiple LDP neighbors is equal to the single link cost value plus the cost value of the binding relationship group corresponding to the LDP neighbor. Through the technical scheme of the present invention, message forwarding interruption caused by link switching is effectively avoided.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a device and method for synchronizing a label distribution protocol and an interior gateway protocol. Background technique [0002] IGP (Interior Gateway Protocol, Interior Gateway Protocol) is a routing protocol dedicated to the internal use of an autonomous domain system, including OSPF (Open Shortest Path First, open shortest path first) routing protocol and IS-IS (Intermediate System-to- Intermediate System, intermediate system to intermediate system) routing protocols, etc. Among them, the two routing protocols OSPF and IS-IS are link-state routing protocols, which refer to protocols that collect link states related to all routers in the network and obtain corresponding routing information through calculation. Generally, the interface information and neighbor information of a routing protocol running on a router are called link state. [0003] LDP (Label Distribution...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/755H04L12/723H04L45/50
Inventor 姚跃腾郭威赵昌峰
Owner NEW H3C TECH CO LTD