Method for switching main and standby links, ring shaped networking and switching equipment

Abstract

The invention provides an active standby link switching method, an annular group network and a switching device. The method is applicable on an annular group network comprising more than two switching devices which adopt Smart Link technology, and the switching devices which adopt Smart Link technology are connected in sequence. The method includes the following steps: the switching devices whichadopt Smart Link technology detect the fault of the link on which the forwarding ports of the switching devices are arranged, the active standby links are switched and the items of a forwarding table are refreshed; whether a switching device connected with a standby port adopts Smart Link technology is judged; if yes, a FLUSH message is generated and is sent to the switching device connected with the standby port; the switching device which receives the FLUSH message refreshes the items of the forwarding table, and if the switching device connected with the other port adopts Smart Link technology, the FLUSH message is transmitted transparently; otherwise, the FLUSH message is discarded. The active standby link switching method can realize active standby link switching to the annular group network.

Description

technical field [0001] The invention relates to the technical field of link redundancy backup, in particular to a master-standby link switching method, ring networking and switching equipment. Background technique [0002] In the prior art, for dual uplink networking, in order to realize redundant backup and fast switching of active and standby links, solutions of flexible link (Smart Link) and monitoring link (Monitor Link) are proposed. see figure 1 , figure 1 It is a schematic diagram of a dual uplink networking structure using Smart Link and Monitor Link technologies in the prior art. exist figure 1 , Smart Link is configured on switching device D. Port D1 and port D2 of switching device D form a Smart Link group. Port D1 is in the forwarding (Active) state, and the link where port D1 is located is a forwarding link; port D2 is blocked. , in a standby (Standby) state, and the link where the port D2 is located is a standby link. When the path where the forwarding por...

AI Technical Summary

Problems solved by technology

When the link where the port E2 on the switching device E is located fails, because the switching device D cannot perceive it, the packets upstream from the switching device D (that is, the packets of VLAN700-800) are still forwarded by the forwarding port D2, and the will result in the loss of these messages

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