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Modifying Parameter Instances

Service Manager activates services without considering current parameter instance values. For example, when you deactivate a video service, Service Manager can add 5 Mbps to a parameter associated with the shaping rate of a video queue.

Similarly, Service Manager can deactivate services and restore parameter instances to their previous value. For example, when you deactivate a video service, Service Manager can subtract 5 Mbps from a parameter associated with the shaping rate of a video queue.

Table 135 lists the results of a series of activations and deactivations of parameters using the add and initial-value keywords.

Table 135: Sample Modifications Using the Add and Initial-Value Keywords

Action	QoS Parameter Instance	Result
Activate	qos-parameter video-bw add 5000000 initial-value 0	Parameter instance video-bw is created with a value of 5000000
Activate	qos-parameter video-bw add 1000000 initial-value 0	Parameter instance video-bw is increased by 1000000, for a total of 6000000
Deactivate	qos-parameter video-bw add 1000000 initial-value 0	Parameter instance video-bw is decreased by 1000000, for a total of 500000
Deactivate	qos-parameter video-bw add 5000000 initial-value 0	Parameter instance video-bw is removed

Removing a parameter instance using profiles is based on the number of times a parameter instance is modified, not the value added.

Modifying parameter instances in profiles and modifying explicit parameter instances can cause invalid parameter instance values. Table 136 lists a series of activations and deactivations using parameter instances in profiles and explicit parameter instances. By the second deactivation, the parameter has a negative value (-4000000).

Note: We recommend that you do not configure negative values for Service Manager.

Table 136: Sample Modifications Using Parameter Instances

Action	QoS Parameter Instance	Result
Activate	qos-parameter video-bw add 5000000 initial-value 0	Parameter instance video-bw is created with a value of 5000000
Activate	qos-parameter video-bw add 1000000 initial-value 0	1000000 is added to parameter instance video-bw, for a total of 6000000
Activate	qos-parameter video-bw 2000000	Parameter instance video-bw is set to 2000000
Deactivate	qos-parameter video-bw add 1000000 initial-value 0	1000000 is subtracted from parameter instance video-bw for a total of 1000000
Deactivate	qos-parameter video-bw add 5000000 initial-value 0	5000000 is subtracted from parameter instance video-bw for a total of -4000000
Deactivate	qos-parameter video-bw 2000000	Parameter instance video-bw is removed

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