Chapter 18
| VLAN Commands
Configuring VLAN Interfaces
– 446 –
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)#
switchport
ingress-filtering
This command enables ingress filtering for an interface. Use the
no
form to
restore the default.
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