Configuring Mpls-Te; Building Mpls-Te Topology - Cisco NCS 5500 Series Configuration Manual

Mpls ios xr release 6.2.x
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Implementing MPLS Traffic Engineering
MPLS-TE Path Calculation Module
This calculation module operates at the LSP headend. The module determines a path to use for an LSP. The
path calculation uses a link-state database containing flooded topology and resource information.
RSVP with TE Extensions
RSVP operates at each LSP hop and is used to signal and maintain LSPs based on the calculated path.
MPLS-TE Link Management Module
This module operates at each LSP hop, performs link call admission on the RSVP signaling messages, and
keep track on topology and resource information to be flooded.
Link-state IGP
Either Intermediate System-to-Intermediate System (IS-IS) or Open Shortest Path First (OSPF) can be used
as IGPs. These IGPs are used to globally flood topology and resource information from the link management
module.
Label Switching Forwarding
This forwarding mechanism provides routers with a Layer 2-like ability to direct traffic across multiple hops
of the LSP established by RSVP signaling.

Configuring MPLS-TE

MPLS-TE requires co-ordination among several global neighbor routers. RSVP, MPLS-TE and IGP are
configured on all routers and interfaces in the MPLS traffic engineering network. Explicit path and TE tunnel
interfaces are configured only on the head-end routers. MPLS-TE requires some basic configuration tasks
explained in this section.

Building MPLS-TE Topology

Building MPLS-TE topology, sets up the environment for creating MPLS-TE tunnels. This procedure includes
the basic node and interface configuration for enabling MPLS-TE. To perform constraint-based routing, you
need to enable OSPF or IS-IS as IGP extension.
Before You Begin
Before you start to build the MPLS-TE topology, the following pre-requisites are required:
• Stable router ID is required at either end of the link to ensure that the link is successful. If you do not
• Enable RSVP on the port interface.
assign a router ID, the system defaults to the global router ID. Default router IDs are subject to change,
which can result in an unstable link.
MPLS Configuration Guide for Cisco NCS 5500 Series Routers, IOS XR Release 6.2.x
Configuring MPLS-TE
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