Technical Documentation

Creating End-to-End LSPs to Traverse the FA-LSP

After you create the FA-LSPs and traffic engineering links, you can configure end-to-end LSPs to travel across the FA-LSPs. Here are some general guidelines for this step:

  • In general, it is best to start your end-to-end LSP at least one hop before the ingress of the FA-LSP and terminate your LSP at least one hop after the egress of the FA-LSP. If you do originate both the end-to-end LSP and the FA-LSP on the same routing platform, you must disable CSPF and configure strict paths for the LSPs.
  • If you configure CSPF, OSPF, and RSVP to create the FA-LSP, the LSP should automatically use the FA-LSP because of the preferred lower metric generated by the reduced number of hops.
  • If you disable CSPF on the FA-LSP with the no-cspf option at the [edit protocols mpls label-switched-path lsp-name] hierarchy level, you must configure the peer interface as a strict next hop in the path for your regular LSP. To manually configure an LSP to travel over the FA-LSP, include the address statement at the [edit protocols mpls path path-name] hierarchy level and include the strict option.

For more information about creating RSVP LSPs, see the JUNOS MPLS Applications Configuration Guide.

Published: 2010-04-15