There is provided a method and apparatus for synchronization of topology state information between two network nodes in a communications network. The communications network has a routing protocol for intermittent advertisement of local state information throughout the network. The two network nodes include...http://www.google.de/patents/US6876625?utm_source=gb-gplus-sharePatent US6876625 - Method and apparatus for topology database re-synchronization in communications networks having topology state routing protocols
