A method and device for notifying link failure state of access circuit side

Abstract

The invention discloses a method for notifying the failure state of the link on the access circuit (AC) side, which includes: if it is determined that the state of the link on the AC side changes from failure to normal, restarting the operation, administration and maintenance (OAM) connection If it is determined that the status of the link on the AC side changes from normal to fault, then stop sending the OAM CC message. The present invention also discloses a notification device for the fault state of the AC side link. By adopting the present invention, the OAM state of the pseudo wire (PW) side link can be linked with the OAM state of the AC side link, and the judgment of the AC side chain can be reduced. The time spent on whether the path fault is eliminated can increase the switching speed, thereby reducing the network packet loss rate and improving the reliability of the network.

Description

technical field [0001] The present invention relates to a protection switching technology in a Layer 2 Virtual Private Network (L2VPN, Layer 2Virtual Private Network) of Multi-Protocol Label Switching (MPLS, Multi-Protocol Label Switching), in particular to an access circuit (AC, Attachment Circuit) side A method and device for notifying a link fault state. Background technique [0002] A protection switching scheme provided by Multi-Protocol Label Switching (MPLS, Multi-Protocol Label Switching) Layer 2 Virtual Private Network (L2VPN, Layer 2Virtual Private Network) is a pseudowire (PW, Pseudo Wire) dual-homing protection scheme, which consists of structured as figure 1 Shown: Customer Edge (CE, Customer Edge) device 1 is connected to Provider Edge (PE, Provider Edge) device 1, and PE device 1 is dual-homed to PE device 2 and PE device 3 through active and standby PWs, where PE device 1 is the network device that manages the active / standby PW. The path between PE 1 and PE...

AI Technical Summary

Problems solved by technology

[0004] However, compared with the method of judging that the link fault on the PW side is removed, when it is judged that the link fault on the AC side is removed, since the sending period of the CSF message is longer (for example, the sending period of the CSF message is usually one second), and PE device 1 needs to make decisions based on multiple cycles of CSF messages, so the switchback will be slow; especially when the system requires zero-delay switchback (WTR, Wait To Restore), PE device 1 cannot Determine whether the link failure on the AC side has been resolved, resulting in a switchback speed that cannot meet the requirements, thereby further affecting the reliability of the network

[0005] It can be seen that in the existing methods for judging whether the link fault on the AC side is eliminated, it takes a lot of time to switch back slowly, and then a large number of packets are lost, which affects the reliability of the network.

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