Specifications

6-6
Cisco XR 12000 Series Router SIP and SPA Software Configuration Guide, Release 3.2
Release 3.2, OL-6396-01, Rev.A1 January 9, 2006
Chapter 6 Configuring POS SPAs on Cisco IOS XR Software
Configuration Tasks
Configuring SONET APS
This task explains how to configure basic automatic protection switching (APS) on the router and how
to configure more than one protect or working interface on a router by using the aps group command.
The SONET APS is a feature offering recovery from fiber (external) or equipment (interface and
internal) failures at the SONET line layer.
Note The loopback interface in the example is used as the interconnect. The aps group command is used even
when a single protect group is configured.
To verify the configuration or to determine if a switchover has occurred, use the show aps command.
Summary Steps
1. configure
2. aps group number
3. channel {0 | 1} local {sonet | preconfigure} number
4. Repeat Step 3 for each channel in the group.
5. exit
6. interface loopback number
Step 11
end
or
commit
Example:
RP/0/0/CPU0:router(config-sonet)# end
or
RP/0/0/CPU0:router(config-sonet)# commit
Saves configuration changes.
• When you issue the end command, the system prompts
you to commit changes:
Uncommitted changes found. Commit them before
exiting (yes/no/cancel)? [cancel]:
– Entering yes saves configuration changes to the
running configuration file, exits the configuration
session, and returns the router to EXEC mode.
– Entering no exits the configuration session and
returns the router to EXEC mode without
committing the configuration changes.
– Entering cancel leaves the router in the current
configuration session without exiting or
committing the configuration changes.
• Use the commit command to save the configuration
changes to the running configuration file and remain
within the configuration session.
Step 12
show controllers sonet number
Example:
RP/0/0/CPU0:router# show controllers sonet
0/1/0/0
Verifies the SONET controller configuration.
Command or Action Purpose