Communication method and apparatus

A communication apparatus, applied to a first network apparatus in a network of a Multichassis Link Aggregation Group (M-LAG);

• the network of the M-LAG further comprises a second network apparatus, wherein a Peerlink link established between the first network apparatus and the second network apparatus is faulty, the communication apparatus comprising:
• a processor and a non-transitory storage medium storing machine executable instructions, wherein by executing the machine executable instructions, the processor is caused to:
• forward traffic based on a first forwarding entry comprised in the first network apparatus in response to the first forwarding entry for forwarding the traffic is not aged;
• acquire a first prefix entry reaching the target network apparatus from a local Link State Database (LSDB);
• update a first cost value in the first prefix entry to a second cost value;
• the updated first prefix entry indicates a route reaching the target network apparatus through the first network apparatus;
• update a local shortest path tree based on the updated first prefix entry;
• wherein the shortest path tree includes an updated first route, the updated first route includes the second cost value, and the updated first route indicates a route reaching the target network apparatus through the first network apparatus;
• and
• send a first packet to a third network apparatus in response to determining that the first network apparatus is a network apparatus performing traffic switchover, comprising:
• sending the first packet carrying the updated first prefix entry to the third network apparatus, so that the third network apparatus is to regenerate a forwarding path to reach a target network apparatus through the second network apparatus, and delete a sub-routing entry contained in a second routing entry corresponding to the updated first prefix entry from a second routing table and delete a sub-forwarding entry in the forwarding table based on the sub-routing entry;
• wherein the third network apparatus is an apparatus accessed by both the first network apparatus and the second network apparatus, and a path from the third network apparatus to the first network apparatus and a path from the third network apparatus to the second network apparatus are equal-cost paths.