Users Guide
NOTE: You cannot assign an IP address to the Default VLAN (VLAN 1). To assign another VLAN ID to the Default VLAN, use the
default vlan-id vlan-id command.
You can place VLANs and other logical interfaces in Layer 3 mode to receive and send routed trac. For more information, refer to Bulk
Conguration.
To assign an IP address, use the following command.
• Congure an IP address and mask on the interface.
INTERFACE mode
ip address ip-address mask [secondary]
• 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 congure up to eight secondary IP addresses.
Conguring Native VLANs
Traditionally, ports can be either untagged for membership to one VLAN or tagged for membership to multiple VLANs.
You must connect an untagged port to a VLAN-unaware station (one that does not understand VLAN tags), and you must connect a
tagged port to a VLAN-aware station (one that generates and understands VLAN tags).
Native VLAN support breaks this barrier so that you can connect a port 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 trac on the same physical port. The
classic example is connecting a voice-over-IP (VOIP) phone and a PC to the same port of the switch. The VOIP phone is congured to
generate tagged packets (with VLAN = VOICE VLAN) and the attached PC generates untagged packets.
NOTE
: When a hybrid port is untagged in a VLAN but it receives tagged trac, all trac is
accepted.
NOTE: You cannot congure an existing switchport or port channel interface for Native VLAN. Interfaces must have no other
Layer 2 or Layer 3 congurations when using the portmode hybrid command or a message similar to this displays: % Error:
Port is in Layer-2 mode Te 5/6.
To congure a port so that it can be a member of an untagged and tagged VLANs, use the following commands.
1 Remove any Layer 2 or Layer 3 congurations from the interface.
INTERFACE mode
2 Congure the interface for Hybrid mode.
INTERFACE mode
portmode hybrid
3 Congure the interface for Switchport mode.
INTERFACE mode
switchport
4 Add the interface to a tagged or untagged VLAN.
VLAN INTERFACE mode
[tagged | untagged]
1016
Virtual LANs (VLANs)