Patent ID: 9025442
Filing Date: 2015-05-05
Classification: H04L

Abstract:
1. A method in a first provider edge (PE) router in a multiprotocol label switching (MPLS) network, the MPLS network comprising the first PE router communicatively coupled to a second PE router, for providing a primary and a redundant pseudo wire (PW) between the first PE router and the second PE router, wherein the primary and the redundant PW use disjoint bidirectional reservation protocol traffic engineering (RSVP-TE) label-switched-paths (LSPs), the method comprising: establishing a first bidirectional RSVP-TE LSP, wherein the first bidirectional RSVP-TE LSP includes a first upstream path for transporting traffic from the first PE router to the second PE router, and a first downstream path for transporting traffic from the second PE router to the first PE router; transmitting a first label distribution protocol (LDP) label mapping message to the second PE router, wherein the first LDP label mapping message includes a first transport path include field that causes the second PE router to use the first downstream path for the primary PW; establishing a second bidirectional RSVP-TE LSP, wherein the second bidirectional RSVP-TE LSP includes a second upstream path for transporting network traffic from the first PE router to the second PE router, and a second downstream path for transporting network traffic from the second PE router to the first PE router, wherein the second bidirectional RSVP-TE LSP and the first bidirectional RSVP-TE LSP are disjoint RSVP-TE LSPs; and transmitting a second LDP label mapping message to the second PE router, and wherein the second LDP label mapping message includes a second transport path include field that causes the second PE router to use the second downstream path for the redundant PW.