A method and system enables policy-based traffic forwarding in a data network by implementing policy-based control over propagation of LSA messages through the data network. A route tag is asserted in respect of a link state advertisement (LSA) message advertising a network address. Propagation of the...http://www.google.com.au/patents/US7831733?utm_source=gb-gplus-sharePatent US7831733 - Policy-based forwarding in open shortest path first (OSPF) networks
