Patent ID: 8804570

Claim:
A method comprising: detecting, by a first provider edge (PE) device, a topology change event; unblocking, by the first PE device, a port of the first PE device based on the topology change event; generating, by the first PE device, a first message based on unblocking of the port, the first message including information to prompt a second PE device to flush a routing table of the second PE device and to prompt the second PE device to generate a second message to transmit to a first customer edge (CE) device that is connected to the second PE device, and the second PE device and the first CE device corresponding to a first affected site, the first PE device corresponding to a second affected site, and the topology change event including a break of a connection between the first affected site and the second affected site; transmitting, by the first PE device, the first message to the second PE device; and receiving, by the first PE device and from the second PE device, a packet sent by an end host connected to the first affected site.