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Catalyst4500 Series SwitchCiscoIOS Command Reference—Release 12.2(18)EW
78-16201-01
Chapter2Cisco IOS Commands for the Catalyst 4500 Series Switches
vlan internal allocation policy
vlan internal allocation policy
Use the vlan internal allocation policy command to configure the internal VLAN allocation scheme.
Use the no form of this command to return to the default setting.
vlan internal allocation policy {ascending | descending}
no vlan internal allocation policy
Syntax Description
Defaults The default is the ascending allocation scheme.
Command Modes Global configuration mode
Command History
Usage Guidelines You can configure internal VLAN allocation to be from 1006 and up or from 4094 and down.
Internal VLANs and user-configured VLANs share the 1006 to 4094 VLAN spaces. A “first come, first
served” policy is used in allocating these spaces.
The vlan internal allocation policy command allows you to configure the allocation direction of the
internal VLAN.
During system bootup, internal VLANs required for featues in the startup-config file are allocated first.
User-configured VLANs in the startup-config file are configured next. If you configure a VLAN that
conflicts with an existing internal VLAN, the VLAN you configured is put into a nonoperational status
until the internal VLAN is freed and becomes available.
After you enter the write mem command and the system reloads, the reconfigured allocation scheme is
used by the port manager.
Examples This example shows how to configure VLANs in a descending order as the internal VLAN allocation
policy:
Switch(config)# vlan internal allocation policy descending
Switch(config)#
Related Commands show vlan internal usage
ascending Allocates internal VLANs from 1006 to 4094.
descending Allocates internal VLANs from 4094 to 1006.
Release Modification
12.1(19)EW Support for this command was introduced on the Catalyst 4500 series switch.
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