MPLS is strategically significant for TE because it can potentially provide most of the functionality available from the overlay model (described in the preceding section), with much better integration with IP. MPLS for TE is attractive because it enables you to do the following:
Manually or dynamically build explicit LSPs
Efficiently manage LSPs
Define traffic trunks and map them to LSPs
Associate a set of attributes with traffic trunks to change their characteristics
Associate a set of attributes with resources that constrain the placement of LSPs and traffic trunks mapped to those LSPs
Aggregate and deaggregate traffic (whereas IP routing only allows aggregation)
Easily incorporate a constraint-based routing framework ...