Backup Autotunnel Assignment - Cisco ASR 9000 Series Configuration Manual
Aggregation services router mpls
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Also See for ASR 9000 Series:
- Command reference manual (1138 pages) ,
- Routing configuration manual (702 pages) ,
- Reference manual (696 pages)
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Implementing MPLS Traffic Engineering
They protect LSPs by enabling the node upstream of a link or node failure to reroute the LSPs and their traffic
around a node failure to the next-hop node. NNHOP backup tunnels also provide protection from link failures
because they bypass the failed link and the node.
This figure illustrates node protection.
Figure 11: 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.)
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
OL-28381-02
Static backup and Backup AutoTunnel cannot exist together on the same interface or
Note
link.
Note
Node protection is always preferred over link protection in the Backup AutoTunnel
assignment.
Cisco ASR 9000 Series Aggregation Services Router MPLS Configuration Guide, Release 4.3.x
MPLS Traffic Engineering
119
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