Double-returning protection switching method based on VPLS and system

Abstract

The invention discloses a double-returning protection switching method based on virtual private local area network service (VPLS), comprising the following steps: a provider edge device (PE) side judges that a bidirectional forwarding detection (BFD) state of an ascending pseudo wire is converted into an abnormal condition from a normal state, the state of a port connecting the PE side and a user edge device (CE) is modified to be abnormal; CE side detects that the port connected with the PE side is abnormal, business flow is switched to a standby chain; the invention discloses a double-returning protection switching system correspondingly; in the invention, due to linkage of the CE side and PW side, when the VC in the network has a problem, AC side is notified timely and the AC side is switched, therefore, the invention can avoid flow interruption and improve communication stability.

Description

technical field [0001] The invention relates to protection switching technology in Internet Protocol (Internet Protocol, IP) network, in particular to a dual-homing protection switching method and system based on virtual private LAN service (Virtual Private Lan Service, VPLS). Background technique [0002] When operators develop communication services, they put the reliability and fault handling capabilities of the network at a very important position, and the rapid detection of faults and the protection switching of services are the embodiment of the fault handling capabilities of the network. IP networks, especially in recent years, have The popular carrier-grade Ethernet puts the protection switching capability of the network in the first place. How to make the network switch quickly when a fault occurs is the goal pursued by various equipment providers. The current bearer network adopts a variety of technologies to improve the detection speed of network faults and prote...

AI Technical Summary

Problems solved by technology

In the CE access layer, redundant backup or load sharing access strategies are usually adopted, or Rapid Spanning Tree Protocol (Rapid Spanning Tree Protocol, RSTP) and Virtual Router Redundancy Protocol (Virtual Router Redundancy Protocol, VRRP) are enabled to achieve Protection switching, however, VRRP is a layer-3 redundant backup protocol, which cannot be applied to the VPLS technology in Layer 2 VPN (level 2VPN, L2VPN)

[0004] The protection switching methods that are often used in VPLS are VPN FRR, TE FRR, etc. These protection methods are used to protect the operator's network. The virtual circuit (Virtual Circuit, VC) is independent, that is to say, the status of the VC on the PE side will not be affected by the AC access, and the AC side cannot detect whether the VC status is normal. When a problem occurs on the VC, the AC side cannot be notified in time and the AC side is switched, which further leads to a short interruption of traffic

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