MERGE POINT DETERMINATION IN REFRESH INTERVAL INDEPENDENT FAST REROUTE FACILITY PROTECTION

摘要

In one example, techniques of this disclosure may enable a point of local repair (PLR) network device to signal availability of link protection or node protection to a merge point (MP) network device and enable a network device to actively determine whether or not it is a merge point router. Based on whether or not the network device determines it is a MP, the network device may selectively clean up LSP states when there is an upstream link or node failure. The RSVP-TE protocol may be extended to enable a network device to send a tear down message to a downstream router, which may enable the downstream router to conditionally delete locale LSP state information. In some instances, a PLR network device may directly send a tear down message to a MP network device even though the PLR network device may not have a working bypass LSP.

主权项

1. A method comprising:
receiving, by a network device and from an upstream network device, a resource reservation path message to establish a label switched path, wherein the upstream network device is positioned upstream from the network device along the label switched path; determining, by the network device, based on the resource reservation path message, whether the network device is a candidate merge point for the label switched path; determining, by the network device, whether there a remote hello session between the network device and the upstream device; and responsive to determining that the network device is a candidate merge point and determining that there is the remote hello session with the upstream device, determining, by the network device, that the network device is a merge point for the upstream device.