Switching method and system

Abstract

The invention discloses a switching method and a switching system. The method comprises the step of: sending a message to a far end PE through a dual-homed PED when dual-homed client equipment (CE) or dual-homed provider equipment confirms a primary link failure, wherein the message contains the address information of the dual-homed CE. The method also comprises the steps of switching a flow from a primary PW to a spare PW through the far end PE so as to be transmitted, and switching the flow from the primary link to a spare link through the dual-homed client equipment so as to be transmitted. The invention also provides a switching system. According to the technical scheme of the invention, when the link of the dual-homed CE is in failure, the switching for the link of the dual-homed CE and PW is rapidly performed without influence on the flow of the single-homed CE.

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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