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LDP Operation

Because LDP runs on top of an interior gateway protocol (IGP) such as IS-IS or OSPF, you must configure LDP and the IGP on the same set of interfaces. After both are configured, LDP begins transmitting and receiving LDP messages through all LDP-enabled interfaces.

Because of LDP's simplicity, it cannot perform true traffic engineering like RSVP. LDP does not support bandwidth reservation or traffic constraints.

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