
9.6
Constraint-Based LSP Setup Using LDP (CR-LDP) 439
LSPs or to reposition existing ones and issue a request to the ingress of the LSP.
From there, the request is signaled along the path of the LSP conventionally
using Downstream on Demand label distribution.
The IETF did not specify that only one signaling protocol could be used to
establish constraint-based LSPs in a traffic engineered MPLS network. As a result,
two protocols grew up side-by-side with similar, but not identical, features. The
next three sections examine Constraint-Based LSP Setup Using LDP (CR-LDP),
and Extensions to RSVP for ...