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Advertising Label-Switched Paths into OSPFv2

One main reason to configure label-switched paths (LSPs) in your network is to control the shortest path between two points on the network. You can advertise LSPs into OSPFv2 as point-to-point links so that all participating routing devices can take the LSP into account when performing SPF calculations. The advertisement contains a local address (the from address of the LSP), a remote address (the to address of the LSP), and a metric with the following precedence:

  1. Use the LSP metric defined under OSPFv2.
  2. Use the LSP metric configured for the label-switched path under MPLS.
  3. If you do not configure any of the above, use the default OSPFv2 metric of 1.

Note: If you want an LSP that is announced into OSPFv2 to be used in SPF calculations, there must be a reverse link (that is, a link from the tail end of the LSP to the head end). You can accomplish this by configuring an LSP in the reverse direction and also announcing it in OSPFv2.

 

Related Documentation

 

Published: 2012-12-08

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