Specifications

APS Configuration Examples
Configuring Serial Interfaces IC-121
APS Configuration Examples
The following examples show how to configure basic APS on a router and how to configure more
than one protect/working interface on a router by using the aps group command.
Basic APS Configuration
The following example shows the configuration of APS on Router A and Router B (see Figure 20).
In this example, Router A is configured with the working interface, and Router B is configured with
the protect interface. If the working interface on Router A becomes unavailable, the connection will
automatically switchover to the protect interface on Router B.
Figure 20 Basic APS Configuration
On Router A, which contains the working interface, 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-if)# aps working 1
Router(config-if)# end
Router#
On Router B, which contains the protect interface, 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 3/0/0
Router(config-if)# aps protect 1 7.7.7.7
Router(config-if)# end
Router#
To verify the configuration or to determine if a switchover has occurred, use the show aps command.
Multiple APS Interface Configuration
To configure more than one protect/working interface on a router, you must use the aps group
command. The following example shows the configuration of grouping more than one
working/protect interface on a router. In this example, Router A is configured with a working
interface and a protect interface, and Router B is configured with a working interface and a protect
interface. If the working interface 2/0/0 on Router A becomes unavailable, the connection will
Router A
E 0/0
POS 2/0/0
Working Interface
SONET
Network
Equipment
Add/Drop Multiplexer (ADM)
E 0/0
Router B
POS 3/0/0
Protect Interface
10325