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Cisco ONS 15530 Configuration Guide and Command Reference
78-14227-01, Cisco IOS Release 12.1(10)EV2
Chapter7 Configuring APS
Requesting a Switchover or Lockout
The Cisco ONS 15530 supports APS switchover and lockout requests from the CLI. These requests have
priorities depending on the condition of the protection signal and the existence of other switchover
requests. There are three types of switchover requests:
•Lockout requests—Have the highest priority and take effect regardless of the condition of the
protection signal. A lockout prevents the active signal from switching over from the working path
to the protection path.
•Forced switchover requests—Have the next highest priority and are only prevented if there is an
existing lockout on the protection path, or the signal on the protection path has failed when
switching from working to protection.
•Manual switchover requests—Have the lowest priority and are only honored if there is no lockout,
forced switchover, or signal failure or degrade.
In summary, the priority order is:
1. Lockout
2. Signal failure on the protection path
3. Forced switchover
4. Signal failure on the working path
5. Signal degrade on the protection path
6. Signal degrade on the working path
7. Manual switchover
If a request or condition of a higher priority is in effect, a lower priority request is rejected.
Note APS lockouts and forced or manual switchover requests do not persist across processor card
switchovers or system reloads.
Requesting a Switchover or Lockout
To prevent switchovers to the protection signal, or to request a signal switchover, use the following
commands in privileged EXEC mode:
Examples
The following example shows how to request a forced switchover from working to protection except if
a lockout is in effect on the protection path:
Switch# aps switch blue force working-to-protection
The following example shows how to prevent a switchover to the protection path:
Switch# aps lockout blue
Command Purpose
aps lockout group-name Locks out all switchovers to the protection path.
aps switch group-name {force | manual}
{protection-to-working |
working-to-protection}
Requests a signal switchover of the active signal from the
working path to the protection path, or vice versa, within
an associated interface pair.