
Cisco IOSSoftware Configurationforthe Cisco12000Series One-PortChannelized OC-12/STM-4(DS1/E1)ISE Line
Configuring the Serial Interfaces
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Cisco IOS Release 12.0(27)S1
Configuring Automatic Protection Switch
On the 1-Port CHOC-12 ISE line card, you configure APS at the SONET controller level, and not at the
interface level as in Packet-Over-Sonet.
The minimum configuration tasks to complete for configuring APS are as follows:
• Configure APS working and protect interfaces
Use the aps working and the aps protect controller configuration commands to specify the working
and protect channels.
• Configure other APS features (Optional)
Other APS features include the following:
–
group
–
lockout
–
manual
–
reflector
–
revert
–
signalling
–
timers
–
unidirectional
• Monitor and maintain APS (Optional)
Use the show aps, show controllers sonet, and show interfaces EXEC commands to monitor APS
configurations.
• Configure SONET Alarm Reporting (Optional)
For procedures on how to configure automatic protection switching on the 1-Port CHOC-12 ISE line
card, see the document, Automatic Protection Switching of Packet-over-SONET Circuits, at the following
URL:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios112/ios112p/gsr/posapsgs.htm
Two SONET connections are required to utilize APS and, in a Telco environment, the SONET circuits
must be provisioned for APS. At the time of provisioning, the operation (ie. 1+1), mode (ie.
bidirectional) and revert operation (that is, no revert) need to be specified. If the SONET connections are
homed on two separate routers (the normal configuration), then a communications channel between the
two routers (NOT utilizing the working and protect SONET circuits) needs to be set up for APS
communication.
In enabling APS operation, it is recommended to configure the working channel first. Normal operation
with 1+1 operation is to configure it as working channel 1.
Configuration on the router hosting the working channel:
Router# configure terminal
Router(config)# interface ethernet 0/0
Router(config-if)# ip address 7.7.7.7 255.255.255.0
Router(config-if)# exit
Router(config)# controller sonet 4/0
Router(config-controller)# aps working 1
Configuration on the router hosting the protect channel:
Router# configure terminal
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