Specifications

Serial Interface Configuration Examples
IC-122
Cisco IOS Interface Configuration Guide
switchover to the protect interface 3/0/0 on Router B because they are both in APS group 10.
Similarly, if the working interface 2/0/0 on Router B becomes unavailable, the connection will
switchover to the protect interface 3/0/0 on Router A because they are both in APS group 20.
Figure 21 Multiple Working and Protect Interfaces Configuration
Note Configure the working interface before configuring the protect interface to avoid the protect
interface becoming the active circuit and disabling the working circuit when it is finally discovered.
On Router A, which contains the working interface for group 10 and the protect interface for group
20, use the following configuration:
Router# configure terminal
Router(config)# interface ethernet 0/0
Router(config-if)# ip address 7.7.7.6 255.255.255.0
Router(config)# interface pos 2/0/0
Router(config)# aps group 10
Router(config-if)# aps working 1
Router(config)# interface pos 3/0/0
Router(config-if)# aps group 20
Router(config-if)# aps protect 1 7.7.7.7
Router(config-if)# end
Router#
On Router B, which contains the protect interface for group 10 and the working interface for group
20, use the following configuration:
Router# configure terminal
Router(config)# interface ethernet 0/0
Router(config-if)# ip address 7.7.7.7 255.255.255.0
Router(config)# interface pos 2/0/0
router(config)# aps group 20
Router(config-if)# aps working 1
Router(config)# interface pos 3/0/0
Router(config-if)# aps group 10
Router(config-if)# aps protect 1 7.7.7.6
Router(config-if)# end
Router#
To verify the configuration or to determine if a switchover has occurred, use the show aps command.
Router A
E 0/0
POS 2/0/0
Working Interface 10
POS 2/0/0
Working Interface 20
SONET
Network
Equipment
Add/Drop Multiplexer (ADM)
E 0/0
Router B
10326
POS 3/0/0
Protect Interface 20
POS 3/0/0
Protect Interface 10