Selective label switched path re-routing

摘要

In one example, a method includes establishing a plurality of label switched paths (LSPs) having a common transit network device other than an ingress network device or an egress network device of any of the plurality of LSPs, and, by the transit network device along the plurality of LSPs, detecting a congestion condition on a link along the plurality of LSPs and coupled to the transit network device. The method also includes, responsive to detecting the congestion condition, and by the transit network device, selecting a subset of the plurality of LSPs to evict from the link, wherein the subset comprises less than all of the plurality of LSPs, and updating a forwarding plane of the transit network device to reroute network traffic received for the selected subset of the plurality of the LSPs for forwarding to a next hop on a bypass LSP that avoids the link.

主权项

1. A method comprising:
establishing a plurality of label switched paths (LSPs) having a common transit network device other than an ingress network device or an egress network device of any of the plurality of LSPs; by the transit network device along the plurality of LSPs, detecting a congestion condition on a link along the plurality of LSPs and coupled to the transit network device; responsive to detecting the congestion condition, and by the transit network device, selecting a subset of the plurality of LSPs to evict from the link, wherein the subset comprises less than all of the plurality of LSPs; outputting an error message to one or more ingress network devices associated with the selected subset of the plurality of LSPs to evict from the link, without outputting an error message to the ingress network devices associated with those of the plurality of LSPs not selected to evict from the link, wherein the error message specifies the respective one of the selected subset of LSPs; and updating a forwarding plane of the transit network device to reroute network traffic received for the selected subset of the plurality of the LSPs for forwarding to a next hop on a bypass LSP that avoids the link.