What is an OLC state?
Description
Performing a maintenance operation on an NE can generate a considerable number of NFM-P alarms that are not of interest to an operator. You can configure the OLC state of a service or equipment object to specify whether the object is in service or in maintenance mode. During a subsequent maintenance operation, you can filter alarms using the OLC state as a criterion in order to display only the alarms of interest.
Note: The NFM-P raises alarms against service and equipment objects regardless of the OLC state, which is not deployed to NEs.
You can set the OLC state on the following equipment and service objects:
Note: A shelf OLC state is inherited from the parent NE, and is not configurable.
On equipment and service properties forms, you can configure the NFM-P to change the OLC state of an object after a specified time, depending on the current OLC state. In a device discovery rule, you can configure the default OLC state for NEs, and can specify that the current OLC state reverts when the NE discovery is complete. You can also specify that the NFM-P raise an informational alarm about an object OLC state reverting to the opposite state. See the NSP NFM-P User Guide for information about device discovery rules and OLC states.
Setting the OLC state
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CAUTION Service Disruption |
Changing the OLC state of an object also changes the OLC state of child objects that are not locked in maintenance mode, and may affect NFM-P system performance.
Ensure that you change the OLC state of an object that has many child objects only during a period of low NFM-P activity, such as during a scheduled maintenance period.
Note: An OLC state change operation may take several minutes to complete, depending on the number of objects that the state change affects.
A child object inherits the OLC state of the parent object. However, you can lock the OLC state of a child object in maintenance mode to prevent the inheritance in the event that the parent OLC state changes. Locking the OLC state of an object also locks the OLC state of each child object.
You can specify a global default OLC state for discovered services; see How do I set the NFM-P system preferences?.
During a shutdown or turn-up operation, the OLC state of the parent object overwrites the OLC state of each child object, unless the OLC state of a child object is locked in maintenance mode. The NFM-P Task Manager logs the OLC state change of an object, but does not log the OLC state changes of the child objects.
Note: When an OLC state change affects a large number of objects, alarms raised against affected objects before the state change is propagated show the previous OLC state. Also, if an operator shuts down an equipment or service object via CLI, the associated NE trap handling for the child objects requires additional processing which can cause the same propagation delay and OLC state misrepresentation in alarms.
Functional description
When the OLC state of an NE is set to maintenance mode, all child objects such as access interfaces, card slots, daughter cards, and ports are set to maintenance mode, as is each service site on the NE.
When the OLC state of a composite service or service is set to the maintenance mode, the following child objects are affected:
When the OLC state of a composite service or services changes to in service, the OLC states of the associated sites and SAPs do not change if the host equipment objects are in maintenance mode.
The OLC state of an object must be in service before you can change the OLC state of a child object. You can change the OLC state of a parent object regardless of the OLC state of a child object, but if a child object has more than one parent object and the OLC state of one parent is set to maintenance, the child object is set to maintenance. You cannot change the OLC state of an object when a parent OLC state is set to maintenance.
You can configure the default OLC state for objects that become administratively down from the OLC tab of the System Preferences form; see How do I set the NFM-P system preferences?.
You must add the OLC state property to manually created service templates, as described in How do I add the OLC state property to a manually created service template? .