Cisco 300 Series Cli Manual page 1089

Stackable managed switches

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User Guidelines

The switch requires an internal VLAN in the following cases:

One VLAN for each IP interface is defined directly on an Ethernet port or on

a Port channel.

One VLAN for each IPv6 tunnel.

One VLAN for 802.1x.

When a switch needs an internal VLAN it takes a free VLAN with the highest VLAN

Use the vlan prohibit-internal-usage command to define a list of VLANs that cannot

be used as internal VLANs after reload.

If a VLAN was chosen by the software for internal usage, but you want to use that

VLAN for a static or dynamic VLAN, do one of the following

Add the VLAN to the Prohibited User Reserved VLAN list.

Copy the Running Configuration file to the Startup Configuration file

Reload the switch

Create the VLAN

Example 1—The following example specifies that VLANs 4010, 4012, and

4090-4094 cannot be used as internal VLANs:

vlan prohibit-internal-usage add 4010,4012,4090-4094

Example 2—The following specifies that all VLANs except 4000-4107 cannot be

used as internal VLANs:

vlan prohibit-internal-usage all

vlan prohibit-internal-usage remove 4000-4107

Example 3—The following specifies that all VLANs except 4000-4107 cannot be

used as internal VLANs:

Virtual Local Area Network (VLAN) Commands

OL-32830-01 Command Line Interface Reference Guide