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Create a VLAN

The Default VLAN is part of the system startup configuration, and is by default,

VLAN 1. You may make another VLAN the Default VLAN. The Default

VLAN cannot be deleted, disabled, or configured (you cannot assign it an IP

address), and only untagged interfaces can belong to it.

When an interface is configured, a switchport automatically places it in the

default VLAN as an untagged interface. All switchports must belong to at least

one VLAN, so to remove a switchport from the Default VLAN, you must place

it as tagged or untagged in some other VLAN, or remove the switchport

configuration.

Task

Create a VLAN

Display all VLANs.

A port may either be an untagged member of a single VLAN, or a tagged

member of perhaps multiple VLANs.

•

Untagged Ports — ports that do not append an 802.1Q VLAN tag to frames

on egress, and do not accept tagged frames on ingress (tagged frames are

dropped). Untagged ports must be connected to VLAN-unaware devices.

•

Tagged Ports — ports that append an 802.1Q tag to frames on egress, and

accept only tagged frames on ingress (untagged frames are dropped). Tagged

ports must be connected to VLAN-aware devices.

When you configure an enabled port as a switchport, the port is placed in the

default VLAN. To remove a switchport from the default VLAN, remove the

switchport configuration. To move the port to another VLAN, add it to the

desired VLAN as either a tagged or untagged member.

To view just the interfaces that are in Layer 2 mode, enter the show interfaces

switchport command in the EXEC mode.

Command Syntax

interface vlan vlan-id

show vlan vlan-id

Installing the Software

Command Mode

CONFIGURATION

EXEC Privilege