Patent ID: 8804496
Filing Date: 2014-08-12
Classification: H04L

Abstract:
1. A method comprising: signaling, with a first pseudowire stitching point, to at least one of a head-end network device or a tail-end network device an ability of the first pseudowire stitching point to act as a stitching point for a multi-segment pseudowire, wherein the multi-segment pseudowire extends from the head-end network device to the tail-end network device, wherein a primary path of the multi-segment pseudowire includes the first pseudowire stitching point and a second pseudowire stitching point, wherein the multi-segment pseudowire transits a plurality of packet switch network tunnels, and wherein the signaling comprises advertising reachability information of the first pseudowire stitching point to at least one of the head-end network device or the tail-end network device, wherein, for each respective pseudowire stitching point on a primary path of the multi-segment pseudowire that signals an ability to act as a stitching point for the multi-segment pseudowire, a backup path that excludes the respective pseudowire stitching point is computed prior to a failure of the respective pseudowire stitching point; detecting a failure of the second pseudowire stitching point with the first pseudowire stitching point; and transmitting data indicative of the failure of the second pseudowire stitching point to the head-end network device from the first pseudowire stitching point, wherein the pre-computed backup path that excludes the second pseudowire stitching point is selected by the head-end network device in response to receipt of the data, and the pre-computed backup path is selected by the tail-end network device in response to receipt of a signal initiated by the head-end network device to the tail-end network device over the pre-computed backup path, the signal indicative of selection of the pre-computed backup path by the head-end network device.