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14-13
Cisco 10000 Series Router Software Configuration Guide
OL-2226-23
Chapter 14 Configuring Automatic Protection Switching
Single-router Automatic Protection Switching
Example 14-3 Clearing SR-APS Commands on a Channel
Example 14-3 shows how to clear SR-APS commands on redundant Channelized OC-12 POS cards in
slots 5 and 6:
Router# aps clear pos 5/0/0
Example 14-4 Forcing a SR-APS Switch
Example 14-4 shows how to force a switch from the working channel to the protection channel:
Router# aps force POS 5/0/0 from working
Example 14-5 Performing a Manual SR-APS Switch
Example 14-5 show how to manually switch the active channel from the working channel to the
protection channel:
Router# aps manual POS 5/0/0 from working
Threshold Commands
Threshold commands allow you to specify criteria that trigger a cutover. In addition to the criteria set by
these commands, cutovers are triggered by Section Loss of Signal (SLOS) critical alarms, Section Loss
of Frame (SLOF) critical alarms, and Line Alarm Indicate Signal (LAIS) major alarms.
Specifying SR-APS Signal Degrade BER Threshold
Use the aps signal-degrade BER threshold command to modify the bit error rate threshold that, if
exceeded, triggers an APS cutover.
aps signal-degrade BER threshold value
[no] aps signal-degrade
Where value can be in the range of 10
-5
to 10
-9
. Enter this value as a single digit between 5 and 9.
The default signal degrade BER threshold value is 10
-6
.
Router# aps lockout [POS | SONET]
slot#/subslot#/port#
Prevents a channel from automatically switching to the active,
working, or protection state.
Router# aps manual [POS | SONET]
slot#/subslot#/port# from [working | protection]
Manually switches from the working channel to the protection
channel, or from the protection channel to the working channel.
from working—Manually switches from the working channel to
the protection channel.
Note This command has no effect if the protection channel is
currently the active channel.
from protection—Manually switches from the protection
channel to the working channel.
Note This command has no effect if the working channel is
currently the active channel.
Command Purpose