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Command Mode
Interface Configuration (Ethernet, Port Channel)
Command Usage
• 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)#
Displaying VLAN Information
Command
show vlan
show interfaces status vlan
show interfaces switchport
show vlan
This command shows VLAN information.
Syntax
show vlan [id vlan-id | name vlan-name]
•
id - Keyword to be followed by the VLAN ID.
vlan-id - ID of the configured VLAN. (Range: 1-4094, no leading zeroes)
•
name - Keyword to be followed by the VLAN name.
vlan-name - ASCII string from 1 to 32 characters.
Function
Shows VLAN information
Displays status for the specified VLAN interface
Displays the administrative and operational status of an
interface
VLAN Commands
Mode Page
NE, PE
4-143
NE, PE
4-91
NE, PE
4-93
4-143
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