Bulk-Configured VC Ranges

An active bulk-configured VC range is associated with a dynamic ATM 1483 subinterface that supports a dynamic upper-layer encapsulation type. For ATM line modules that support VC oversubscription, the maximum number of active bulk-configured VCs per line module is less than the maximum number of individual VCs created from the total number of bulk-configured VC ranges that the line module supports. For information about configuring dynamic ATM 1483 subinterfaces with bulk-configured VC ranges, see Configuring ATM 1483 Dynamic Subinterfaces.

When the maximum number of active bulk-configured VCs has been reached, the router prevents all additional subscribers associated with the remaining inactive bulk-configured VCs from connecting to the line module until one of the following conditions occurs:

• At least one currently active subscriber logs out, which causes the router to tear down the dynamic interface column for that subscriber. Although the dynamic ATM 1483 subinterface and its associated VC remain configured on the router, the subinterface becomes inactive and can be replaced by one of the bulk-configured VCs waiting to become active.
• The router tears down at least one dynamic interface column in its entirety, which involves administratively shutting down the associated dynamic ATM 1483 subinterface.

When either of these conditions occurs, the router enables the first inactive bulk-configured VC that receives traffic to connect to the router as a replacement for the subscriber that logged out.

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