Foundry Networks Switch and Router Installation And Configuration Manual page 192

Foundry Switch and Router Installation and Configuration Guide
Single-Device APS Configuration
The working and protect interfaces can reside on the same device. Figure 6.9 illustrates this kind of configuration.
Figure 6.9 Single-device POS APS configuration
The working interface resides on POS interface 2/1, and the protect interface resides on POS interface 3/1. The
working and protect interfaces can also reside on the same module.
The following commands configure the working and protect interfaces in Figure 6.9:
BigIron(config)# interface loopback 1
BigIron(config-lbif-1)# ip address 10.0.0.1/24
BigIron(config-lbif-1)# exit
BigIron(config)# interface pos 2/1
BigIron(config-posif-2/1)# aps working 1
BigIron(config-posif-2/1)# exit
BigIron(config)# interface pos 3/1
BigIron(config-posif-3/1)# aps protect 1 10.0.0.1
BigIron(config-posif-3/1)# exit
Configuring Optional Parameters
You can configure optional POS APS parameters to do the following:
• Configure an authentication string for communication between the process controlling the working interface
and the process controlling the protect interface
• Force a protect interface to take over as a working interface
• Prevent a protect interface from taking over from a working interface
• Manually cause a switchover from a working interface to a protect interface
• Configure the WTR (wait-to-restore) interval for a working interface
• Set the timers that the protect interface uses for sending hello packets and waiting for a response from the
working interface
• Set thresholds for bit error rate, signal degradation, and signal failure on a POS interface
Configuring an Authentication String
The working and protect interfaces are synchronized using the APS Protect Group Protocol, which provides
communication between the process controlling the working interface and the process controlling the protect
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Working Interface POS 2/1
BigIron
BigIron
Protect Interface POS 3/1
SONET ADM
December 2000