METHOD AND APPARATUS FOR PATH COMPUTATION ELEMENT AND ROUTING CONTROLLER COOPERATION

摘要

A system, method, and node for a Routing Controller, RC, (202) to obtain from a Path Computation Element, PCE, (204) network resource path metrics (308) across a plurality of domains (320, 322) in a communication network in which each domain includes a plurality of Border Nodes, BNs (324- 338). The RC (202) sends to the PCE (204) a first message requesting a first path computation between each pair of BNs. The first message contains a maximum metric-value indicating a maximum that a path computation must not exceed for a Path Computation Client, PCC, (202) to consider the path computation acceptable Next, the RC sends a second message requesting the PCE to compute a subsequent path computation for each BN pairs for which the first path computation did not exceed the maximum metric-value. The second message contains a minimum metric-value that a path metric must exceed for the PCC to consider the path metric acceptable Next, the RC receives the computed subsequent path computation between BN pairs that exceed the minimum metric-value.