SESSION-BASED FORWARDING

摘要

The present disclosure discloses a method and network device for session based forwarding. Specifically, the disclosed system receives a first packet in a session, and performs a route lookup to determine a route for the first packet. Then, the system caches a reference to the route and a neighbor in the session, and also caches a reference to the session in a tunnel within which packets in the session are to be forwarded. Based on a comparison between the route version number cached in the session and the route version number in a route table corresponding to the route referenced by a route index in the session, the system determines whether the route is stale. If so, the system performs another route lookup to update the route. Moreover, the system uses cached reference to the session in the tunnel for forwarding subsequent packets in the session.

主权项

1. A method comprising:
receiving, by a network device, a first packet in a session; performing, by the network device, a route lookup based on a header of the first packet to determine a route for the first packet; and caching, by the network device, a reference to the route and a neighbor in the session such that subsequent packets in the session are routed based on the cached reference in lieu of subsequent route lookups.