Mpls Configuration Overview; Lsps; Paths - Alcatel-Lucent 7450 Manual

Ethernet service switch

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MPLS Configuration Overview

Multiprotocol Label Switching (MPLS) enables routers to forward traffic based on a simple

label embedded into the packet header. A router examines the label to determine the next hop

for the packet, saving time for router address lookups to the next node when forwarding

packets. MPLS is not enabled by default and must be explicitly enabled.

In order to implement MPLS, the following entities must be configured:

To configure MPLS-signaled label-switched paths (LSPs), an LSP must run from an ingress

router to an egress router. Configure only the ingress router and configure LSPs to allow the

software to make the forwarding decisions or statically configure some or all routers in the

path. The LSP is set up by Resource Reservation Protocol (RSVP), through RSVP signaling

messages. The router automatically manages label values. Labels that are automatically

assigned have values ranging from 1,024 through 1,048,575 (see

A static LSP is a manually set up LSP where the nexthop IP address and the outgoing label are

explicitly specified.

To configure signaled LSPs, you must first create one or more named paths on the ingress

router. For each path, the transit routers (hops) in the path are specified.

LSPs on page 172

Paths on page 172

Router Interface on page 173

Label Values on page

7450 ESS MPLS Guide