LDP Support

The Label Distribution Protocol (LDP) is a protocol defined by the IETF for the purpose of establishing MPLS LSPs. Using LDP, peer LSRs exchange label binding information to create LSPs. The LDP features supported in this release include:
  • Downstream unsolicited label advertisement.
  • Liberal label retention.
  • Ordered control mode.
  • Advertisement of labels for direct interfaces, RIP routes, and static routes.
  • Ability to use multiple IGP routing protocols (for example IS-IS, OSPF, and BGP).
  • LDP loop detection.
  • Configurable LDP timers.


To use BGP as an IGP routing protocol, issue the enable mpls ldp bgp-routes command.