Host routing processing method in virtual subnet, related equipment and communication system

Abstract

The embodiment of the invention discloses a host routing processing method in a virtual subnet, related equipment and a communication system. Wherein, a host routing processing method in a virtual subnet includes: a first operator border device receives a message for address resolution, and the virtual subnet site where the first operator border device is located further includes at least one first Two operator border devices; the first operator border device determines whether the source MAC address carried in the message is a virtual MAC address; if it is determined that the source MAC address is a virtual MAC address, at least one of the following operations is not performed: save the message The routing table entry of the CE host at the local customer boundary corresponding to the carried source IP address, and the routing protocol based on the Layer 3 VPN distributes the route of the local CE host corresponding to the IP address in the virtual subnet. The solutions of the embodiments of the present invention are beneficial to avoiding the formation of CE host routing loops as far as possible, thereby improving the efficiency of transmitting data packets between CE hosts.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a routing processing method of a local host in a virtual subnet, related equipment and a communication system. Background technique [0002] The provider edge (PE, Provider Edge) devices in the virtual subnet (VS, Virtual Subnet) usually use the routing protocol of the three-layer virtual private network (L3VPN, Layer3Virtual Private Network) to exchange the local customer edge (CE, Customer Edge) host routing, and then achieve subnet extension (subnet extension). [0003] The PE device can record the local CE host information in the Address Resolution Protocol (ARP, Address Resolution Protocol) or Neighbor Discovery (ND, Neighbor Discovery) protocol cache table, and generate the corresponding Internet Protocol (IP, Internet Protocol) address of the local CE host. The local CE host route is distributed to the virtual subnet based on the L3VPN routing protocol, and other PE...

AI Technical Summary

Problems solved by technology

Practice has found that when there are multiple PE devices in some sites of the virtual subnet to achieve site multi-homing, it is often easy to form CE host routing loops, and the formation of CE host routing loops usually increases the number of data packets. The length of the forwarding path may greatly affect the efficiency of transmitting data packets between CE hosts

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