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{{Short description|Computer network control protocol}}
{{Refimprove|date=December 2014}}
'''Constraint-based Routing Label Distribution Protocol''' ('''CR-LDP''') is a control protocol used in some computer networks.
As of February 2003, the IETF MPLS working group deprecated CR-LDP and decided to focus purely on [[RSVP-TE]].<ref>{{cite journal |title=The Multiprotocol Label Switching (MPLS) Working Group decision on MPLS signaling protocols |author1=L. Andersson|author2=G. Swallow |rfc=3468 |date=February 2003 |page=6 |doi=10.17487/RFC3468 }}</ref>

It is an extension of the [[Label Distribution Protocol]] (LDP), one of the protocols in the [[Multiprotocol Label Switching]] architecture. CR-LDP contains extensions for LDP to extend its capabilities such as setup paths beyond what is available for the [[routing]] protocol. For instance, a [[label-switched path]] can be set up based on explicit route constraints, [[quality of service]] constraints, and other constraints. Constraint-based routing (CR) is a mechanism used to meet [[traffic engineering (telecommunications)|traffic engineering]] requirements. These requirements are met by extending LDP for support of constraint-based routed label-switched paths (CR-LSPs). Other uses for CR-LSPs include MPLS-based [[virtual private network]]s.
CR-LDP is almost same as basic LDP, in packet structure, but it contains some extra TLVs which basically set up the constraint-based LSP.

==References==
{{Reflist}}

[[Category:MPLS networking]]
[[Category:Network protocols]]

{{Compu-network-stub}}

Constraint-based Routing Label Distribution Protocol - Revision history

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