Why mpls ppt

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Thank you! Published by Dale Sullivan Modified over 3 years ago. In conventional IP forwarding, a particular router will typically consider two packets to be in the same FEC if there is some address prefix X in that router's routing tables such that X is the "longest match" for each packet's destination address. As the packet traverses the network, each hop in turn reexamines the packet and assigns it to a FEC. The FEC to which the packet is assigned is encoded as a short fixed length value known as a "label".

When a packet is forwarded to its next hop, the label is sent along with it; that is, the packets are "labeled" before they are forwarded. At subsequent hops, there is no further analysis of the packet's network layer header. Rather, the label is used as an index into a table LFIB which specifies the next hop, and a new label. The old label is replaced with the new label, and the packet is forwarded to its next hop. No packet classification into FEC is done. This path is called a label-switched path.

Label-switched paths are similar to ATM PVCs in that they are simplex in nature; that is, the traffic flows in one direction from the ingress router to a egress router. Duplex traffic requires two label-switched paths; that is, one path to carry traffic in each direction. A label-switched path is created by the concatenation of one or more label-switched hops, allowing a packet to be forwarded from one label-switching router to another label-switching router across the MPLS domain.

A label-switching router is a router that supports MPLS-based forwarding. The label transforms the packet from one that is forwarded based on its IP routing information to one that is forwarded based on information associated with the label.