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 a first path message at a tail-end node of a bidirectional tunnel, the 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 bi-directional tunnel; examining the one or more objects of the first path message to determine whether an explicit route object (ERO) is present in the first path message; in response to the ERO being present in the first path message, signaling the reverse direction path specified by the ERO; and in response to the ERO not being present in the first path message,
examining an Extended Association object of the message to determine whether an Association Type of the paths is co-routed or non co-routed; andin response to the Association Type being non co-routed, computing and signaling the reverse direction path.