Mpls Traffic Engineering; Backup Autotunnels - Cisco ASR 9000 Series Configuration Manual

Implementing MPLS Traffic Engineering
tunnels between a given ingress and egress can be configured, and the flow is distributed using load sharing
among the tunnels.
Related Topics
Building MPLS-TE Topology, on page 155
Creating an MPLS-TE Tunnel, on page 158
Build MPLS-TE Topology and Tunnels: Example, on page 252

MPLS Traffic Engineering

Multiprotocol Label Switching (MPLS) is an Internet Engineering Task Force (IETF)-specified framework
that provides efficient designation, routing, forwarding, and switching of traffic flows through the network.
TE is the process of adjusting bandwidth allocations to ensure that enough bandwidth is available for
high-priority traffic.
In MPLS TE, the upstream router creates a network tunnel for a particular traffic stream and sets the bandwidth
available for that tunnel.

Backup AutoTunnels

The MPLS Traffic Engineering AutoTunnel Backup feature enables a router to dynamically build backup
tunnels on the interfaces that are configured with MPLS TE tunnels. This feature enables a router to dynamically
build backup tunnels when they are needed. This prevents you from having to build MPLS TE tunnels statically.
The MPLS Traffic Engineering (TE)—AutoTunnel Backup feature has these benefits:
• Backup tunnels are built automatically, eliminating the need for users to preconfigure each backup tunnel
• Protection is expanded—FRR does not protect IP traffic that is not using the TE tunnel or Label
This feature protects against these failures:
• P2P Tunnel NHOP protection—Protects against link failure for the associated P2P protected tunnel
• P2P Tunnel NNHOP protection—Protects against node failure for the associated P2P protected tunnel
• P2MP Tunnel NHOP protection—Protects against link failure for the associated P2MP protected
Related Topics
Enabling an AutoTunnel Backup, on page 167
Removing an AutoTunnel Backup, on page 168
Establishing MPLS Backup AutoTunnels to Protect Fast Reroutable TE LSPs, on page 169
Establishing Next-Hop Tunnels with Link Protection, on page 171
Configure the MPLS-TE Auto-Tunnel Backup: Example, on page 262
OL-28381-02
and then assign the backup tunnel to the protected interface.
Distribution Protocol (LDP) labels that are not using the TE tunnel.
tunnel
Cisco ASR 9000 Series Aggregation Services Router MPLS Configuration Guide, Release 4.3.x
MPLS Traffic Engineering
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