Chapter 19
| VLAN Commands
Configuring VLAN Interfaces
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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.
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
◆
If a port or trunk has switchport mode set to
access
, then only one VLAN can be
added with this command. If a VLAN list is specified, only the last VLAN in the
list will be added to the interface.
◆
A port, or a trunk with switchport mode set to
hybrid
, must be assigned to at
least one 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.
◆
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.
◆
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.
Example
The following example shows how to add VLANs 1, 2, 5 and 6 to the allowed list as
tagged VLANs for port 1:
Console(config)#interface ethernet 1/1
Console(config-if)#switchport allowed vlan add 1,2,5,6 tagged
Console(config-if)#
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