Constraint-Based Routing and Operation in MPLS TE

The most important requirement of TE is that the characteristics, as well as resource availability, on links on the network (in addition to bandwidth that would be used for cost computations) be propagated across the network to allow efficient choice of possible TE LSP paths. In link-state routing protocols, the preferred path still predominantly takes into consideration the bandwidth on the link between any two routers to compute the cost or metric associated with that path, prior to preferred path allocation. Enabling the use of link-state routing protocols to efficiently propagate information pertaining to resource availability in their routing updates is performed by additional extensions ...

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