Patent ID: 8964732
Filing Date: 2015-02-24
Classification: H04L

Abstract:
1. A topology transparent zone in an Autonomous System domain comprising: a plurality of interconnected topology transparent zone nodes comprising at least some topology transparent zone edge nodes, wherein the topology transparent zone edge nodes are connected to a plurality of neighboring external nodes in the Autonomous System domain via a plurality of external links; and a plurality of internal links each of which interconnects a pair of the topology transparent zone nodes, wherein the topology transparent zone (TTZ) nodes exchange a plurality of link state advertisements (LSAs) with one another describing the links connected to the TTZ nodes without distributing any link state information related to the topology transparent zone's inner-topology to any of the external nodes, wherein a common router advertisement is constructed and distributed to the neighboring external nodes, wherein the common router advertisement comprises a router link state advertisement (LSA) comprising: an LSA header comprising a link state type field specifying a router LSA type; a router links field comprising a plurality of router links each of which describe a different one of the external links; and a number of links field specifying the number of router links in the router links field, wherein the LSA header further comprises a Link state identifier (ID) field specifying a unique ID that is associated with the topology transparent zone, and an advertising router field specifying a unique ID associated with the topology transparent zone, and wherein the unique ID is a topology transparent zone ID, a largest router ID, or a smallest router ID among the router IDs of the topology transparent zone nodes.