Private-Vlan - Cisco Catalyst 3750 Command Reference Manual

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private-vlan

Use the private-vlan VLAN configuration command on the switch stack or on a standalone switch to

configure private VLANs and to configure the association between private-VLAN primary and

secondary VLANs. Use the no form of this command to return the VLAN to normal VLAN

configuration.

This command is available only if the stack master is running the enhanced multilayer image (EMI). We

strongly recommend that the stack members also run the EMI when private VLANs are configured.

Syntax Description

secondary-vlan-list

The switch must be in VTP transparent mode when you configure private VLANs.

The default is to have no private VLANs configured.

Command Modes

VLAN configuration

Command History

Usage Guidelines

Before configuring private VLANs, you must disable VTP (VTP mode transparent). After you configure

a private VLAN, you should not change the VTP mode to client or server.

VTP does not propagate private-VLAN configuration. You must manually configure private VLANs on

all switches in the Layer 2 network to merge their Layer 2 databases and to prevent flooding of

private-VLAN traffic.

You cannot include VLAN 1 or VLANs 1002 to 1005 in the private-VLAN configuration. Extended

VLANs (VLAN IDs 1006 to 4094) can be configured in private VLANs.

Catalyst 3750 Switch Command Reference

private-vlan {association [add | remove] secondary-vlan-list | community | isolated | primary}

no private-vlan {association | community | isolated | primary}

Create an association between the primary VLAN and a secondary VLAN.

Specify one or more secondary VLANs to be associated with a primary

VLAN in a private VLAN.

Associate a secondary VLAN to a primary VLAN.

Clear the association between a secondary VLAN and a primary VLAN.

Designate the VLAN as a community VLAN.

Modification

This command was introduced.

Catalyst 3750 Switch Cisco IOS Commands