Reference Guide

834 | Virtual LANs (VLAN)
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Assign an IP address to a VLAN
VLANs are a Layer 2 feature. For two physical interfaces on different VLANs to communicate, you must
assign an IP address to the VLANs to route traffic between the two interfaces.
The
shutdown command in INTERFACE mode does not affect Layer 2 traffic on the interface; the
shutdown command only prevents Layer 3 traffic from traversing over the interface.
To assign an IP address, use the following command in INTERFACE mode:
In FTOS, VLANs and other logical interfaces can be placed in Layer 3 mode to receive and send routed
traffic. For details, refer to Bulk Configuration
.
Native VLANs
Traditionally, ports can be either untagged for membership to one VLAN or tagged for membership to
multiple VLANs. An untagged port must be connected to a VLAN-unaware station (one that does not
understand VLAN tags), and a tagged port must be connected to a VLAN-aware station (one that generates
and understands VLAN tags).
Native VLAN support breaks this barrier so that a port can be connected to both VLAN-aware and
VLAN-unaware stations. Such ports are referred to as hybrid ports. Physical and port-channel interfaces
may be hybrid ports.
Native VLAN is useful in deployments where a Layer 2 port can receive both tagged and untagged traffic
on the same physical port. The classic example is connecting a VOIP phone and a PC to the same port of
the switch. The VOIP phone is configured to generate tagged packets (with VLAN = VOICE VLAN), and
the attached PC generates untagged packets.
To configure a port so that it can be a member of an untagged and tagged VLANs:
Note: An IP address cannot be assigned to the Default VLAN, which, by default, is VLAN 1. To assign
another VLAN ID to the Default VLAN, use the default vlan-id vlan-id command.
Command Syntax Command Mode Purpose
ip address ip-address mask [secondary] INTERFACE Configure an IP address and mask on the interface.
• ip-address mask — Enter an address in
dotted-decimal format (A.B.C.D) and the mask
must be in slash format (/24).
• secondary — This is the interface’s backup IP
address. You can configure up to eight secondary
IP addresses.
Step Task Command Command Mode
1 Remove any Layer 2 or Layer 3 configurations from the interface. INTERFACE