Use this command to configure the list of allowed VLANs that can receive and send traffic on this interface in tagged format when in trunking mode. The default is all.
The VLANs list can be modified using the add or remove options or replaced with another list using the vlan-list, all, or except options. If all is chosen, all VLANs are added to the list of allowed vlan. The except option provides an exclusion list.
Trunk ports accept tagged packets, where tagged packets are processed on the VLAN ID contained in the packet, if this VLAN is in the allowed VLAN list. Tagged packets received with a VLAN ID to which the port is not a member are discarded and MAC learning is not performed. If a VLAN is added to the system after a port is set to the Trunk mode and it is in the allowed VLAN list, this VLAN is assigned to this port automatically.
| Default | all |
| Format | switchport trunk allowed vlan {vlan-list | all | {add vlan-list} | {remove vlan-list} | {except vlan-list }} |
| Mode | Interface Config |
| Parameter | Description |
|---|---|
| all | Specifies all VLANs from 1 to 4093. This keyword is not allowed on commands that do not permit all VLANs in the list to be set at the same time. |
| add | Adds the defined list of VLANs to those currently set instead of replacing the list. |
| remove | Removes the defined list of VLANs from those currently set instead of replacing the list. Valid IDs are from 1 to 4093; extended-range VLAN IDs of the form X-Y or X,Y,Z are valid in this command. |
| except | Lists the VLANs that should be calculated by inverting the defined list of VLANs. (VLANs are added except the ones specified.) |
| vlan-list | Either a single VLAN number from 1 to 4093 or a continuous range of VLANs described by two VLAN numbers, the lesser one first, separated by a hyphen. |
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