Merging Vlan Subranges - Juniper JUNOSE 11.1.X - LINK LAYER CONFIGURATION 4-7-2010 Configuration Manual

host1(config-if)#vlan bulk-config test modify svlan-range 501 550
agent-circuit-identifier
The router retains any overriding profiles assigned to a subrange after you modify
the subrange if the override assignment still falls within the modified subrange. If
the assignment falls outside of the newly modified subrange, the router drops the
overriding profile assignment.
You cannot modify a subrange at the same time you are adding or removing a
subrange. If the new modified values for a subrange partially overlap with another
subrange, the operation fails and the router displays an error message.

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.
Chapter 18: Configuring Dynamic Interfaces Using Bulk Configuration
Configuring VLAN Dynamic Subinterfaces
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