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Chapter 4
Configuring the PA-POS-1OC3
To disable SONET payload scrambling, use the no pos scramble-atm command.
Step 3
Router(config)# interface pos 3/0
Router(config-if)# no pos scramble-atm
Configuring APS
The following example shows the configuration of automatic protection switching (APS) on router A
and router B. (See
router B is configured with the protect interface. If the working interface on router A becomes
unavailable, the connection will automatically switch over to the protect interface on router B.
Figure 4-1
Router A
Router B
On router A, which contains the working interface, use the following configuration:
Router# configure terminal
Router(config)# interface loopback 1
Router(config-if)# ip address 10.7.7.7 255.255.255.0
Router(config)# interface pos 2/0/0
Router(config-if)# aps group 1
Router(config-if)# aps working 1
Router(config-if)# pos ais-shut
Router(config-if)# end
Router#
On router B, which contains the protect interface, use the following configuration:
Router# configure terminal
Router(config)# interface loopback 2
Router(config-if)# ip address 10.7.7.6 255.255.255.0
Router(config)# interface pos 3/0/0
Router(config-if)# aps group 1
Router(config-if)# aps protect 1 10.7.7.7
Router(config-if)# pos ais-shut
Router(config-if)# end
Router#
The loopback interface is used as the interconnect. The aps group command is used even when a single
Note
protect group is configured.
To verify the configuration or to determine if a switchover has occurred, use the show aps command.
OL-6514-04
Figure
4-1.) In this example, router A is configured with the working interface, and
Basic APS Configuration
POS 2/0/0
Working interface
E 0/0
POS 3/0/0
E 0/0
Protect interface
PA-POS-1OC3 Single-Port Port Adapter Installation and Configuration Guide
SONET
network
equipment
Add Drop Multiplexer (ADM)
Customizing the Configuration
4-11
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