Switching method and system

Abstract

The present invention discloses a switching method and system. The method comprises the following steps: a dual-homing provider edge (PE) sends a "redundant Pseudo-Wire (PW) transmit-receive defect" message to a remote PE when a dual-homing customer edge (CE) or the dual-homing PE confirms a primary link failure, or the dual-homing PE announces a "link transmit-receive defect" message to the dual-homing CE when the dual-homing PE or the remote PE confirms a primary PW failure; the remote PE switches the traffic from the primary PW to a spare PW for transmission; the dual-homing CE switches the traffic from the primary link to a spare link for transmission. The present invention also provides a switching system. According to the technical solution of the present invention, when the link of the dual-homing CE is in failure, the links and PWs of the dual-homing CEs are rapidly switched without influence on the traffic of single-homing CEs.

Description

technical field [0001] The present invention relates to a Layer 2 Virtual Private Network (L2VPN, Layer 2 Virtual Private Network) technology in Multi-Protocol Label Switching (MPLS, Multi-Protocol Label Switching) in the data communication field, in particular to a switching method and system. Background technique [0002] The protocol specification related to MPLS L2VPN is being widely discussed and formulated, and it has become the optimal choice available for telecom operators to construct a virtual private network (VPN, Virtual Private Network). The notable technical features of L2VPN are: it supports the intercommunication of multiple link emulation services and multiple Layer 2 link technologies, and is compatible with traditional Layer 2 VPN technologies. MPLS L2VPN mainly has two models: virtual private wire service (VPWS, Virtual Private Wire Service) and virtual private local area network service (VPLS, Virtual Private LAN Service), the former is a pair of client ...

AI Technical Summary

Problems solved by technology

If the MAC List TLV is not empty, it means that the corresponding MAC address entry needs to be revoked in the VPLS network; figure 1 As shown, after PE2 detects that the access link (AC, AttachmentCircuit) 3 fails, the MAC address entries learned from AC3 before can be included in the MAC ListTLV and sent to PE1, and PE1 will revoke the MAC address entry; when When there are many MAC address entries, it is necessary to send multiple messages to cancel, which makes the convergence of service traffic slower; if the MAC List TLV is empty, it means that only the PWs that have received the MAC List TLV need to be kept in the corresponding VPLS network. MAC address entries, while revoking all other MAC address entries, such as figure 1 As shown, after PE2 detects that the link AC3 fails, if it sends an empty MAC List TLV to PE1, PE1 will continue to keep the MAC address entry learned from PW1, so that the unicast traffic arriving at CE3 will continue to be forwarded from PW1 , obviously there is no switching of service traffic, and the service traffic will be discarded when it reaches link AC3, which cannot realize the protection of service traffic

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