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    Configuring RSVP Label-Switched Paths as Backup Paths for OSPF

    When configuring an OSPF interface for link protection or node-link protection, relying on the shortest-path-first (SPF) calculation of backup paths for one-hop neighbors might result in less than 100 percent backup coverage for a specific network topology. You can enhance coverage of OSPF and LDP label-switched-paths (LSPs) by configuring RSVP LSPs as backup paths.

    When configuring an LSP, you must specify the IP address of the egress router.

    Note: RSVP LSPs can be used as backup paths only for the default topology for OSPFv2 and not for a configured topology. Additionally, RSVP LSP cannot be used a backup paths for non-default instances for OSPFv2 or OSPFv3.

    To configure a specific RSVP LSP as a backup path:

    1. Include the backup statement at the [edit protocols mpls labeled-switched-path lsp-name] hierarchy level.
    2. Specify the address of the egress router by including the to ip-address statement at the [edit protocols mpls label-switched-path] hierarchy level.

    In the following example, the RSVP LSP f-to-g is configured as a backup LSP for protected OSPF interfaces. The egress router is configured with the IP address 192.168.1.4.

    [edit]protocols {mpls {label-switched-path f-to-g {to 192.168.1.4;backup;}}}
     

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    Published: 2012-12-08

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