VLAN Commands 4

switchport allowed vlan

This command configures VLAN groups on the selected interface. Use the no form to restore the default.

Note: Each port can only have one untagged VLAN. If a second VLAN is defined for a port as untagged, the other VLAN that had untagged status will automatically be changed to tagged. Setting a VLAN untagged will also change the native VLAN of the port to this VLAN.

Syntax

switchport allowed vlan {add vlan-list[tagged untagged] remove vlan-list}

no switchport allowed vlan

add vlan-list- List of VLAN identifiers to add.

remove vlan-list- List of VLAN identifiers to remove.

vlan-list- Separate nonconsecutive VLAN identifiers with a comma and no spaces; use a hyphen to designate a range of IDs. Do not enter leading zeros. (Range: 1-4094).

Default Setting

All ports are assigned to VLAN 1 by default.

The default frame type is untagged.

Command Mode

Interface Configuration (Ethernet, Port Channel)

Command Usage

A port, or a trunk with switchport mode set to hybrid, must be assigned to a VLAN as untagged.

If a trunk has switchport mode set to trunk (i.e., 1Q Trunk), then you can only assign an interface to VLAN groups as a tagged member.

Frames are always tagged within the switch. The tagged/untagged parameter used when adding a VLAN to an interface tells the switch whether to keep or remove the tag from a frame on egress.

The interface can be added to a VLAN as an untagged member regardless of connected devices to this interface. The default setting is untagged VLAN 1. Note that each port can only have one untagged VLAN. If a second VLAN is defined for a port as untagged, the other VLAN that had untagged status will automatically be changed to tagged. Setting a VLAN untagged will also change the native VLAN of the port to this VLAN.

If a VLAN on the forbidden list for an interface is manually added to that interface, the VLAN is automatically removed from the forbidden list for that interface.

4-173

Page 415
Image 415
SMC Networks SMC8150L2 manual Switchport allowed vlan