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Merging VC Subranges

You can merge multiple subranges of any particular VC range to form a single unified subrange, conserving subrange resources. Merging takes place only when you modify a subrange so that it completely includes at least one other subrange of the same VC range. The merged subranges do not need to be adjacent to each other.

If the encompassing subrange has any circuits that are outside the subranges to be merged, those circuits are added. The encompassing subrange must cover a subrange completely to incorporate it in the merged subrange. The merge operation fails if the encompassing subrange completely overlaps some subranges but only partially overlaps with another subrange. The encompassing subrange does not have to encompass all subranges of the VC range.

Each subrange that is merged with another frees up a subrange. E-series routers currently support a maximum of 300 bulk-configured VC ranges per chassis. Therefore, if a VC range consists of 5 subranges, 295 subranges are still available for subsequent configuration. If you merge 2 of those subranges, resulting in a new total of 4 subranges in the VC range, then 296 subranges are available for configuration.

The router retains any overriding profile assignments on the subranges made before the merger, and applies them to the new merged subrange. You can separate merged subranges either by removing the merged subrange and then adding new separate subranges or by modifying the merged subrange to remove some portion of the subrange and then adding a new subrange.

The following example specifies the original VC subranges.



host1(config-if)#atm bulk-config test vc-range
1 1 101 150 vc-range 2 2 201 250  vc-range
5 5 501 550 vc-range 3 3 301 350

The following command merges two subranges, (1, 1, 101, 150) and
(2, 2, 201, 250), and effectively replaces them with the new subrange (1, 2, 101, 250).



host1(config-if)#atm bulk-config test modify
vc-range 1 2 101 250

To separate the merged subranges, you can modify the unified subrange and add subranges as needed, provided that no dynamic ATM 1483 subinterfaces currently exist for any circuit within those subranges.

If you merge subranges by using SNMP, the new merged subrange takes the lowest instance value of the incorporated subranges. For example, if a VC range has three subranges with instance values of 2, 4, and 5 and the subranges with instance values of 2 and 5 are merged, the new merged subrange has an instance value of 2.

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