Link switching method and device thereof

Abstract

A Pseudo Wire (PW) switching method applied to a MPLS L2VPN comprising U-PE devices and N-PE devices includes checking, by an N-PE device, connectivity of a main U-PW and a backup U-PW between the N-PE device and a U-PE device and connectivity of N-PWs between the N-PE device and other N-PE devices. When one of the main U-PW and the backup U-PW is detected to have failed, transmitting, by the N-PE device, a MAC address clear command through an N-PW in a VSI to which the failed U-PW belongs, and clearing, by an N-PE device receiving the MAC address clear command, MAC addresses associated with the N-PW for transmitting the MAC address clear command in the VSI; and when one of the N-PWs is detected to have failed, transmitting a traffic rerouting command through a U-PW in a VSI to which the failed N-PW belongs and performing U-PW switching.

Description

technical field [0001] The invention relates to the communication field, in particular to a link switching method and device applied to MPLS L2VPN. Background technique [0002] MPLS (Multi-protocol Label Switching, Multi-Protocol Label Switching) is a technology that uses labels bound in IP packets to forward data packets through the network. MPLS is currently widely used in VPN (Virtual Private Network, virtual private network) aspects. The MPLS VPN network adopts label switching, and one label corresponds to one user data flow, which facilitates data isolation between users. MPLS technology can optimize the allocation of network resources to the greatest extent, automatically and quickly repair network faults, and provide high availability and reliability. [0003] MPLS-based Layer 2 VPN (ie, MPLS L2VPN) is a network for service providers to provide customers with Layer 2 services, called Multi-Protocol Label Switching Layer 2 Virtual Private Network. [0004] MPLS L2V...

AI Technical Summary

Problems solved by technology

[0025] The disadvantage of this solution is that after receiving the MAC address revocation message, NPE2 needs to send address revocation to other LDP peers that have established LDP connections; and after receiving the MAC address revocation message, other LDP peers judge that they are at the same level Messages sent by PEs on the network (in the H-VPLS network, there are two levels) are no longer forwarded to other LDP peers, and the implementation is relatively complicated

[0027] The disadvantage of this solution is that the NPE does not know whether the active and standby PWs are deployed, and only when the active and standby PWs are deployed, the MAC address recovery message needs to be sent, otherwise it is a waste even if it is sent

[0028] It can be seen that the above two solutions, on the one hand, for U-PW switching, are implemented by relying on the LDP message of the control plane, which is realized on the control plane, and the convergence is relatively slow compared to direct processing on the data plane; Moreover, whether the protocol standard is scheme 1 or scheme 2, the processing of MAC list TLV is not very clear

On the other hand, there is no corresponding mechanism to speed up the convergence process on the UPE when the N-PW fails

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