DEVICE AND METHOD FOR LIMITING TUNNEL TRAFFIC IN A COMMUNICATION NETWORK

摘要

There is disclosed an apparatus and method for limiting tunnel traffic in a network. Traffic engineering tunnels are used to direct traffic along a predefined path, which may differ from the path that internet protocol (IP) routing would determine. Interior gateway rotocol ((IGP) cut through will allow the forwarding of all destinations downstream of a tunnel through the tunnel, without the operator needing to specify a forwarding equivalence class (FEC). But congestion in the tunnel and network instability may result from this approach. A solution to these problems is disclosed which limits the traffic in the tunnel to only that with destination addresses of the tunnel's egress router or nodes directly supported thereby. Other solutions are disclosed which allow tunnel traffic to nodes having destination addresses other than those being directly supported by the tunnel's egress router. All of these solutions are achieved in both pre-determined forwarding entry and dynamic packet-by packet embodiments.