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This chapter is from the book

This chapter is from the book

Summary

MPLS provides native TE capabilities that can improve network efficiency and service guarantees. These MPLS TE capabilities bring explicit routing, constraint-based routing, and bandwidth reservation to MPLS networks. MPLS TE relies on extensions to existing IP protocols (IS-IS, OSPF, and RSVP). MPLS TE also supports its routing and bandwidth-reservation capabilities per class through the DS-TE extensions. DS-TE retains the same overall operation characteristics of MPLS TE but introduces minor protocol extensions to accommodate multiple classes. DS-TE enforces BCs on network links that complement the bandwidth allocation that DiffServ can provide in the forwarding plane provides. DS-TE can use two different BC models (MAM and RDM). Last, MPLS TE provides a fast protection mechanism for link and node failures using FRR. This mechanism relies on presignaled backup TE LSPs to provide fast protection (in milliseconds) in a scalable manner to other TE LSPs.

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