System and method for providing link, node and pg policy based routing in pnni based atm networks

Abstract

A system and method for providing link, node, and PG policy based routing in PNNI based ATM networks is disclosed. A computer implemented method signals and routes a call in the network. Upon detecting the call's arrival, its service request is accessed. Upon determining that the service request relates to an attribute of a link, a routing path is sought that conforms to the service request, as by accessing information relating to the routing path and comparing the information to the service request. A conforming routing path is selected, and the call is routed via that path. A computer implemented method advertises an attribute of links, nodes, policies, etc. Data relating to the route's attribute can be provided to a node as a GAT IE component of a PNNI signaling setup message for multi-peer group networks, and advertised using PTSEs within a peer group.

1 . A method for routing a data message comprising:
 receiving at an intermediary node, a request for routing the data message;   analyzing the request to determine if the request comprises a filtering attribute specifying a preferred or non-preferred attribute characterizing links or nodes, or combinations thereof, for routing the data message;   filtering a set of links or nodes, or combinations thereof, based at least in part on the filtering attribute to generate a subset of preferred links or nodes, or combinations thereof for routing the data message;   wherein the set comprises links or nodes, or combinations thereof, that are available to route the data message and wherein the subset contains links or nodes, or combinations thereof that conform to the filtering attribute;   performing one or more routing computations on the subset to determine a routing path formed by the links or nodes conforming to the filtering attribute; and   routing the data message according to the determined routing path.