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NXA-ENET24 - Software Management Guide
Configuring VLAN Interfaces (Cont.)
Command Function
switchport allowed vlan
This command configures VLAN
groups on the selected interface.
Use the no form to restore the default.
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 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 neces-
sary to add at most one VLAN as untagged, and this should corre-
spond 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)#
switchport gvrp See page 263.
switchport forbidden vlan
This command configures forbidden
VLANs.
Use the no form to remove the list of
forbidden VLANs.
Syntax:
switchport forbidden vlan {add vlan-list | remove vlan-
list}
no switchport forbidden 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: No VLANs are included in the forbidden list.
Command Mode: Interface Configuration (Ethernet, Port Channel)
Command Usage: This command prevents a VLAN from being auto-
matically added to the specified interface via GVRP.
If a VLAN has been added to the set of allowed VLANs for an inter-
face, then you cannot add it to the set of forbidden VLANs for that
same interface.
Example: The following example shows how to prevent port 1 from
being added to VLAN 3:
Console(config)#interface ethernet 1/1
Console(config-if)#switchport forbidden vlan add 3
Console(config-if)#
switchport priority default Sets a port priority for incoming untagged frames