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End-to-End DSL Architectures by Wayne C. Vermillion

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Multiprotocol Label Switching (MPLS)

VPNs provide the appearance, functionality, and usefulness of a dedicated private network. The VPN feature for MPLS allows a Cisco IOS network to deploy scalable Layer 3 VPN backbone service with private addressing, controlled access, and service-level guarantees between sites. The MPLS standard, published by the IETF, evolved from Cisco developments.

This section describes the basic premise of MPLS, identifies the elements of an MPLS-VPN network, and relates those elements to each other in terms of connectivity.

MPLS itself is a high-performance method of forwarding packets (frames) through a network. It lets routers at the edge of a network apply simple labels to packets (frames). ATM switches or existing ...

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