MPLS FAQ For Beginners

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Q. What protocol and port numbers do LDP and TDP use to distribute labels to LDP/TDP peers?

A. LDP uses TCP port 646, and TDP uses TCP port 711. These ports are opened on the router interface only when mpls ip is configured on the interface. The use of TCP as a transport protocol results in reliable delivery of LDP/TDP information with robust flow control and congestion handling mechanisms.

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