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Merging VLAN Subranges

You can merge multiple subranges of any particular VLAN 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 VLAN range. The merged subranges do not need to be adjacent to each other.

If the encompassing subrange has any VLAN IDs or S-VLAN IDs that are outside the subranges to be merged, those VLAN IDs or S-VLAN IDs 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 VLAN range.

Each subrange that is merged with another frees up a subrange. E-series routers currently support a maximum of 300 bulk-configured VLAN ranges per chassis. Therefore, if a VLAN 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 VLAN 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 VLAN subranges.



host1(config-if)#vlan bulk-config test svlan-range
101 150 1 1 

 svlan-range
201 250 2 2 svlan-range 501 550 5 5 svlan-range 301 350 3 3

The following command merges two subranges (S-VLAN IDs 101–150 and VLAN ID 1) and (S-VLAN IDs 201–250 and VLAN ID 2) and effectively replaces them with the new subrange encompassing S-VLAN IDs 101–250 and VLAN IDs 1–2.



host1(config-if)#vlan bulk-config test modify
svlan-range 101 250 1 2

To separate the merged subranges, you can modify the unified subrange and add subranges as needed, provided that no dynamic VLAN subinterfaces currently exist for any VLAN ID 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 VLAN 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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