Traffic forwarding in a layer 2 edge network

摘要

Methods and network devices are provided for forwarding a message in a layer 2 edge network that includes an access server device connected to sender and gateway devices. Forwarding information including destination IP address, destination MAC address, destination VLAN ID and destination device ID is established. A message is received by the access server device from the sender device. The message includes first destination MAC address, first destination IP address, first destination VLAN ID, and first destination device ID. When the first destination MAC address of a received message is a MAC address of the gateway device, the received message is forwarded according to the first destination MAC address, first destination VLAN ID and first destination device ID. Otherwise the message is modified and forwarded according to second destination MAC address, second destination VLAN ID, and second destination device ID determined to be associated with the first destination IP address.

主权项

1. A method for forwarding a message in a layer 2 edge network that includes an access server device connected to a sender device and a gateway device, the method comprising the access server device:
establishing forwarding information that includes information of destination IP address, destination media access control (MAC) address, destination virtual local area network identifier VLAN ID and destination device ID; receiving, from the sender device, a message with first destination media access control (MAC) address, first destination IP address, first destination virtual local area network identifier (VLAN ID), and first destination device ID; determining whether the first destination MAC address of a received message is not a MAC address of the gateway device; if the first destination MAC address is determined not to be the MAC address of the gateway device, forwarding the received message according to the first destination MAC address, first destination VLAN ID and first destination device ID; otherwise, if the first destination MAC address is determined to be the MAC address of the gateway device, determining second destination MAC address, second destination VLAN ID and second destination device ID associated with the first destination IP address based on the forwarding information; replacing the first destination MAC address with second destination MAC address, first destination VLAN ID with second destination VLAN ID, and first destination device ID with the second destination device ID; replacing a source MAC address of the received message with the MAC address of the gateway device; encapsulating the received message according to the second destination device ID and a device ID of the access server device; and forwarding the encapsulated message according to next hop adjacency information associated with the second destination device ID.