Changing the Administrative State of VC Subranges

VC subranges have an administrative state that enables you to remove dynamic ATM 1483 subinterfaces on various subranges that belong to a single VC range. This functionality is important because subrange removal requires that no dynamic ATM 1483 subinterfaces exist for any circuit on that subrange. The removal operation fails if any such interfaces exist.

By default, the administrative state of a VC subrange is up. When you change the administrative state to down by using the atm bulk-config shutdown command, the router deletes all dynamic ATM 1483 subinterfaces on the affected subranges. You can use the show atm subinterface command or the show atm vc command to monitor the progress of the removal of all dynamic ATM 1483 subinterfaces for the specified subrange.

No additional dynamic ATM 1483 subinterfaces can be created for the subrange until you restore the administrative state to up by using the no atm bulk-config shutdown command.

The following example specifies the original VC subranges.

You cannot specify a partial subrange; the specified subrange must exactly match a subrange that has already been configured. The following command changes the administrative state of the second subrange (2, 2, 201, 250) to down. The router removes all dynamic interface columns built on any of the circuits in this subrange. No additional dynamic ATM 1483 subinterfaces can be created until you change the administrative state to up.

The following command changes the administrative state of this same VC subrange to up.

You can change the administrative state of all subranges in a VC range at the same time by issuing the command without specifying any subranges. The following command shuts down all four subranges belonging to the named VC range, test, regardless of their current state.

The time required for the router to complete an administrative state change depends on the number of VC subranges configured.

atm bulk-config

• Use to create a bulk-configured VC range on a static ATM AAL5 interface for use by a dynamic ATM 1483 subinterface.
• For detailed information about how to use this command, see atm bulk-config.
• Example

  host1(config)#atm bulk-config test1 vc-range 0 1 101 600
  vc-range 3 5 201 3200

• Use the no version to remove the specified VC range from the ATM AAL5 interface, to remove the specified subranges from the specified VC range, or to remove all subranges from the specified VC range. The no version also removes any overriding profile assignments for ATM PVCs within the deleted VC range or VC subrange.
• See atm bulk-config.

atm bulk-config modify

• Use to expand or shorten the range of the specified VC subrange. You can modify only a single specific subrange at a time.
• You can expand a subrange if none of the added circuits overlap with any other subrange. You can shorten a subrange if none of the dropped circuits have existing dynamic ATM 1483 subinterfaces.
• Modifying a subrange so that it completely includes at least one other subrange from within the same VC range effectively merges the subranges. Each subrange that is merged with another frees up a subrange for subsequent configuration. The subranges that are merged do not need to be adjacent to each other.
• The router retains any overriding profiles assigned to a subrange if the assignment falls within the modified subrange. If the assignment falls outside of the newly modified subrange, the router drops the overriding profile assignment. If two subranges are merged, the router retains overriding profiles that were assigned to the separate subranges and applies the overriding profiles to the newly merged subrange.
• Example

  host1(config-if)#atm bulk-config test modify vc-range 2 3 210 230

• There is no no version.
• See atm bulk-config modify.

atm bulk-config shutdown

• Use to administratively disable (shut down) a specified VC subrange or all subranges in a VC range. The administrative state of a VC subrange is enabled by default.
• Disabling the VC subrange deletes all dynamic ATM 1483 subinterfaces on the affected subranges. You can use the show atm subinterface command or the show atm vc command to monitor the progress of the removal of all dynamic ATM 1483 subinterfaces for the specified subrange.
• No dynamic ATM 1483 subinterfaces can subsequently be created for the subrange until you restore the administrative state to enabled by using the no atm bulk-config shutdown command.
• Example

  host1(config-if)#atm bulk-config test shutdown vc-range 2 2 201 250

• Use the no version to enable the specified VC subrange or all subranges in a VC range.
• See atm bulk-config shutdown.

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