SIGNALING CO-ROUTED AND NON CO-ROUTED LSPS OF A BIDIRECTIONAL PACKET TE TUNNEL

摘要

Particular embodiments may enable setup and signaling of co-routed and non co-routed label switched paths (LSPs) of a bidirectional packet traffic engineering (TE) tunnel in an unambiguous manner with respect to provisioning of the LSPs/tunnel. A head-end node may set up the bidirectional packet TE tunnel by computing a forward (and possibly a reverse) direction LSP, and then signal the bidirectional TE tunnel utilizing, e.g., extensions to an associated Resource Reservation Protocol (RSVP) signaling method. The extensions to the associated RSVP signaling method include a plurality of additional Association Types of an Extended Association object carried in a RSVP Path message transmitted by the head-end node to the tail-end node over the forward direction LSP, wherein the additional Association Types explicitly identify the provisioning of the forward and reverse direction LSPs as co-routed or non co-routed.

主权项

1. A method comprising:
receiving, at a tail-end node of a bidirectional tunnel, a first path message transmitted by a head-end node over a forward direction path of the bidirectional tunnel, the first path message including one or more objects used to set up and signal a reverse direction path of the bidirectional tunnel; signaling an explicit route object (ERO) specified in the first path message in the event the first path message specifies an ERO; and computing and signaling a reverse path message in the event the ERO is not present, an Association Type specified as non co-routed in an Extended Association object within the first path message and a record route object (RRO) is not present in the first path message.