Method for construction forwarding table in an MPLS L3VPN

摘要

The present invention is a multi-protocol label exchange: Using a virtual IPv4 address (Multi Protocol Label Switching MPLS) network private network (Virtual Private Network: VPN) forwarding table construction relates to a method for providing a service. Forwarding table construction method according to the invention, in a multi-protocol label switching network, a VRF identifier and the VPN Label information extracted from at least one of PE (Provider Edge) VRF table for a VPN entry received on the router (VPN Routing and Forwarding) and it generates a prefix using the VRF route entry identifier and prefix and extended prefix. And, the route prefix entries and generates the forwarding table containing an identifier for the next hop information. According to the invention, by providing a plurality of forwarding tables for the VPN service without expansion of memory, it can be performed stably packet forwarding.