Chapter 18
| VLAN Commands
Configuring VLAN Interfaces
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switchport allowed
vlan
This command configures VLAN groups on the selected interface. Use the no form
to restore the default.
Syntax
switchport allowed vlan {vlan-list | add vlan-list [tagged | untagged] |
remove vlan-list}
no switchport allowed vlan
vlan-list - If a VLAN list is entered without using the add option, the
interface is assigned to the specified VLANs, and membership in all
previous VLANs is removed. The interface is added as a untagged member
if switchport mode is set to access. Packets are sent as are (that is, with or
without tags) if switchport mode is set to trunk or hybrid.
Separate nonconsecutive VLAN identifiers with a comma and no spaces;
use a hyphen to designate a range of IDs. (Range: 1-4094).
add vlan-list - List of VLAN identifiers to add. When the add option is used,
the interface is assigned to the specified VLANs, and membership in all
previous VLANs is retained.
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. (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
â—† A port, or a trunk with switchport mode set to hybrid, must be assigned to at
least one VLAN as untagged.
â—† 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.
â—† 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.
â—† If none of the intermediate network devices nor the host at the other end of the
connection supports VLANs, the interface should be added to these VLANs as
an untagged member. Otherwise, it is only necessary to add at most one VLAN
as untagged, and this should correspond to the native VLAN for the interface.
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