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Ethernet protection switching method

A protection switching, Ethernet technology, applied in the field of network communication, can solve problems such as slow convergence time, achieve the effect of improving accuracy, solving inaccurate link recovery timing, and preventing some links from being incorrect

Inactive Publication Date: 2014-09-24
引通通讯科技(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] In the recovery process of the ring network protection link failure, due to a certain time difference between the two ends of the recovery link to monitor the link recovery, the convergence time is too slow, and the present invention is mainly to solve this problem

Method used

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Embodiment 1

[0034] see figure 2 , the present invention discloses a kind of Ethernet protection switching method, described method comprises the following steps:

[0035] (S1) The faulty link is recovered, and at this moment, the second port C2 of the first node C and the first port D1 of the second node D are still in a blocked state;

[0036] (S2) The first node C first detects that the problematic link is restored, starts the GUARD timer, and sends NR frames to other nodes. Among them, the GUARD timer is a guard timer. When the faulty link recovers, this timer will be enabled to prevent expired ERPS packets on the link at that time. NR (No Request, no request) frame refers to a no request frame. This scenario is mainly used to inform the Owner master node that there is a node failure recovery.

[0037] (S3) The master node A receives the NR frame and starts the WTR timer; at this time, the second node D does not detect that the link corresponding to the first port D1 has recovered, ...

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Abstract

The invention discloses an Ethernet protection switching method. The method includes the steps that after a main node receives an NR frame, a WTR timer is started; at the moment, a second node does not detect that a link corresponding to a D1 port has recovered and thinks that the link is still in the problem state, an SF reminding message is sent after an NR message sent by a first node is received, and other nodes are reminded that the node still has the problem link; the main node receives an SF reminding message sent by the second node, the WTR timer is turned off, and the main node enters a link protection state again; the second node finds that the link corresponding to the D1 port has recovered, a GUARD timer is started, and an NR frame is sent to other nodes; the WTR timer is started after the main node receives the NR frame; an RPL port A2 is blocked by the WTR timer of the main node in an overtime mode, and an NRRB frame is sent to other nodes; the adjacent nodes block an RPL port B1 again after receiving the NRRB frame; the first node and the second node receive the NRRB frame, and a C2 port and the D1 port which are blocked originally because of faults are opened. The Ethernet protection switching method can solve the problem that convergence time is long when the link recovers.

Description

technical field [0001] The invention belongs to the technical field of network communication and relates to an Ethernet protection switching method, in particular to a link layer-based Ethernet protection switching method. Background technique [0002] ERPS (Ethernet Ring Protection Switching) is an Ethernet protection switching protocol based on the link layer. As the current industrial environment requires more and more reliability and real-time performance of its network, ERPS is being adopted more and more. Compared with other ring network protocols such as STP and EAPS, ERPS has faster protection Switchover time (within 50ms), more complete protocol content, support for more network topologies (single-ring and various multi-ring topologies) and various failure situations (single-link failure, multi-link failure, etc.). [0003] In the ERPS protocol, each node in the network is mainly divided into three types: the master node (RPL Owner Node), the neighbor node (RPL Nei...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/437H04L12/26
Inventor 李建锋
Owner 引通通讯科技(上海)有限公司
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