Host route processing method in virtual subnet, related devices and communication system

Abstract

Disclosed are a processing method and related device for a host route in a virtual sub-network, and a communication system. The processing method for a host route in a virtual sub-network comprises: receiving, by a first operator edge device, a packet used for address parsing, wherein at least one second operator edge device is also included in a virtual sub-network station where the first operator edge device is located; determining, by the first operator edge device, whether a source MAC address carried in the packet is a virtual MAC address; and if it is determined that the source MAC address is a virtual MAC address, not executing at least one of the following operations: saving a table entry of a local customer edge (CE) host route corresponding to a source IP address carried in the packet, and distributing the local CE host route corresponding to the IP address in a virtual sub-network based on a routing protocol of a layer 3 VPN. The solution in the embodiments of the present invention is beneficial to avoid forming CE host route loops as far as possible, thus improving the efficiency of data packet transmission 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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