CR-LDP, constraint-based LDP, is one of the protocols in the MPLS 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, an LSP can be setup based on explicit route constraints, QoS constraints, and other constraints. Constraint-based routing (CR) is a mechanism used to meet 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 VPNs.
Protocol Structure
CR-LDP has the same structure as LDP except the following additional TLV parameters.
| Value | Parameter |
| 821 | LSPID |
| 822 | ResCls |
| 503 | Optical Session Parameters |
| 800 | Explicit Route |
| 801-804 | ER-Hop TLVS |
| 810 | Traffic Parameters |
| 820 | Preemption |
| 823 | Route Pinning |
| 910 | Optical Interface Type |
| 920 | Optical Trail Desc |
| 930 | Optical Label |
| 940 | Lambada Set |
Related Terms: MPLS, LDP, RSVP-TE, IP, ATM, RSVP, OSPF
Sponsor Source: CR-LDP is defined by IETF (http://www.ietf.org) RFC3212.
Reference:
http://www.javvin.com/protocol/rfc3031.pdfMultiprotocol Label Switching Architecture
http://www.javvin.com/protocol/rfc3212.pdfCR-LDP Specification