Foundry Networks Switch and Router Installation And Configuration Manual page 194

Foundry Switch and Router Installation and Configuration Guide
BigIron(config)# interface pos 2/1
BigIron(config-posif-2/1)# aps working 1
BigIron(config-posif-2/1)# aps manual 1
BigIron(config-posif-2/1)# exit
Syntax: aps manual <circuit-number>
The <circuit-number> is a valid POS APS circuit number. In addition, you can specify 0 as the <circuit-number>
(aps manual 0) to manually force traffic from the protect interface to the working interface.
Configuring the Wait-To-Restore Interval for a Working Interface
You can configure an interface to automatically revert to being a working interface after it has been available for a
specified amount of time. For example, to cause an interface to switch back to being a working interface 3
minutes after becoming available, enter commands such as the following:
BigIron(config)# interface pos 2/1
BigIron(config-posif-2/1)# aps protect 1
BigIron(config-posif-2/1)# aps revert 3
BigIron(config-posif-2/1)# exit
Syntax: aps revert <minutes>
Setting POS APS Timers
You can configure the interval at which the process controlling the protect interface sends hello packets to the
process controlling the working interface, as well as how long the process controlling the protect interface waits for
a response before declaring the working interface down.
For example, to configure the protect interface process to send hello packets every 3 seconds and wait a
maximum of 6 seconds for a response, enter commands such as the following on the protect interface:
BigIron(config)# interface pos 3/1
BigIron(config-posif-3/1)# aps protect 1 10.0.0.1
BigIron(config-posif-3/1)# aps timers 3 6
BigIron(config-posif-3/1)# exit
Syntax: aps timers <hello-timer> <response-timer>
The <hello-timer> is the interval between hello packets. The default is 1 second.
The <response-timer> is the amount of time the protect interface process waits for a response from the working
interface process before declaring the working interface down. The default is 3 seconds.
Setting Thresholds for POS APS
A switchover from the working interface to the protect interface can occur due to poor signal quality, bit rate errors,
or link failure. You can set the thresholds for when an APS switchover occurs.
For example, to set thresholds for bit error rate, signal degradation, and signal failure on a POS interface:
BigIron(config)# interface pos 2/1
BigIron(config-posif-2/1)# pos threshold b1-tca 9
BigIron(config-posif-2/1)# pos threshold sd-ber 5
BigIron(config-posif-2/1)# pos threshold sf-ber 5
BigIron(config-posif-2/1)# exit
Syntax: pos threshold <alarm> <threshold>
The <alarm> parameter can be one of the following:
b1-tca B1 bit error rate alarm.
b2-tca B2 bit error rate alarm.
b3-tca B3 bit error rate alarm.
sd-ber Signal degradation alarm.
sf-ber Signal failure alarm.
6 - 32 December 2000