System, method and apparatus for signaling and responding to ERO expansion failure in inter-domain TE LSP

摘要

A system, method and apparatus for performing a constraint base shortest path computation (CSPF) in a manner excluding those nodes indicated as having failed an ERO expansion, the indication being provided via an error code within an RSVP path message associated with setup of an alternate LSP.

主权项

1. In a network supporting Resource Reservation Protocol (RSVP) Inter-Domain Traffic Engineering Label Switched Paths (TE-LSPs), a method comprising:
performing, by a router in a first area, a constrained shortest path first (CSPF) computation associated with a Label Switched Path (LSP) to be terminated at an egress label edge router (LER) in a second area; said CSPF computation excluding those nodes indicated as having failed an explicit route object (ERO) expansion at an area border router (ABR) between said first and second areas, said indication being provided via an error code within an RSVP path message associated with setup of an alternate LSP, said error code identifying the ABR associated with the failed ERO expansion in an excluded route object (XRO) object associated with said alternate LSP.