Cisco CRS Configuration Guide

This figure illustrates node protection.
Figure 12: Node Protection
Backup AutoTunnel Assignment
At the head or mid points of a tunnel, the backup assignment finds an appropriate backup to protect a given
primary tunnel for FRR protection.
The backup assignment logic is performed differently based on the type of backup configured on the output
interface used by the primary tunnel. Configured backup types are:
•
Static Backup
•
AutoTunnel Backup
•
No Backup (In this case no backup assignment is performed and the tunnels is unprotected.)
Static backup and Backup AutoTunnel cannot exist together on the same interface or
link.
Note
Node protection is always preferred over link protection in the Backup AutoTunnel
assignment.
Note
In order that the Backup AutoTunnel feature operates successfully, the following configuration must be applied
at global configuration level:
ipv4 unnumbered mpls traffic-eng Loopback 0
The Loopback 0 is used as router ID.Note
Cisco IOS XR MPLS Configuration Guide for the Cisco CRS Router, Release 5.1.x
170
Implementing MPLS Traffic Engineering
MPLS Traffic Engineering

Cisco CRS Specifications

General

Operating System	Cisco IOS XR
Product Type	Core Router
Form Factor	Modular Chassis
Dimensions	Varies by chassis type
Weight	Varies by chassis type
Architecture	Distributed
Switch Fabric	Multi-stage
Interface Support	Ethernet, SONET/SDH, OTN
Interfaces/Ports	Varies by line card
Port Density	Varies by line card
Routing Protocol	BGP, IS-IS, OSPF, MPLS
Management	CLI, SNMP
Power Supply	Redundant, hot-swappable
Cooling	Redundant, Hot-swappable Fan Trays
Supported Protocols	IPv4, IPv6, MPLS
Management Interfaces	Ethernet, console
Security Features	ACLs