Configuring Link Protection for Point-to-Multipoint LSPs

Link protection helps to ensure that traffic going over a specific interface to a neighboring router can continue to reach this router if that interface fails. When link protection is configured for an interface and a point-to-multipoint LSP that traverses this interface, a bypass LSP is created that handles this traffic if the interface fails. The bypass LSP uses a different interface and path to reach the same destination.

To extend link protection to all of the paths used by a point-to-multipoint LSP, link protection must be configured on each router that each branch LSP traverses. If you enable link protection on a point-to-multipoint LSP, you must enable link protection on all of the branch LSPs.

The Internet draft draft-ietf-mpls-rsvp-te-p2mp-01.txt, Extensions to RSVP-TE for Point to Multipoint TE LSPs, describes link protection for point-to-multipoint LSPs.

To enable link protection on point-to-multipoint LSPs, complete the following steps:

1. Configure link protection on each branch LSP. To configure link protection, include the link-protection statement:

   link-protection;

   You can include this statement at the following hierarchy levels:

   • [edit protocols mpls label-switched-path branch-lsp-name]
   • [edit logical-systems logical-system-name protocols mpls label-switched-path branch-lsp-name]
2. Configure link protection for each RSVP interface on each router that the branch LSP traverses. For information on how to configure link protection on the RSVP interfaces, see Configuring Link Protection on the Interfaces Used by the LSPs.

For more information on how to configure link protection, see Configuring Node Protection or Link Protection.

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