Method, device, and system for quickly informing CGN exception

摘要

A method applicable to a commonest application scenario, the method includes: an AR receives a first packet sent in a unicast manner by a CGN. The first packet includes information for indicating Restart announce, the first packet's source address is the CGN's address, and the first packet's destination address is the AR's address; AR changes the first packet's destination address to an address of a CPE connected to the AR, to obtain a second packet, where the AR and the CPE are connected by using a Layer 2 network, and the CPE's address is a multicast address; and the AR sends the second packet. The method is used for quickly informing, after the CGN restarts or undergoes an active/standby switchover, the CPE that an exception occurs, for example, the CGN restarts or undergoes an active/standby switchover, so that a CGN has relatively small load when recreating NAT mapping.

主权项

1. A method for informing a carrier grade network address translation (CGN) exception, comprising:
receiving, by a receiving unit of an access router (AR), a first packet sent in a unicast manner by a carrier grade network address translation (CGN) device, wherein the first packet comprises information for indicating Restart announce, a source address of the first packet is an address of the CGN device, and a destination address of the first packet is an address of the AR; changing, by a generating unit of the AR, the destination address of the first packet to an address of a customer premise equipment (CPE) connected to the AR, to obtain a second packet, wherein the AR and the CPE are connected by using a Layer 2 network, and the address of the CPE is a multicast address; and sending, by a sending unit of the AR, the second packet to the CPE.