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Catalyst 2950 and Catalyst 2955 Switch Command Reference
OL-10102-01
Chapter 2 Catalyst 2950 and 2955 Cisco IOS Commands
vlan (VLAN configuration)
Command Modes VLAN configuration
Command History
Usage Guidelines You can only use this command mode for configuring normal-range VLANs, that is, VLAN IDs 1 to
1005.
Note To configure extended-range VLANs (VLAN IDs 1006 to 4094), use the vlan global configuration
command.
VLAN configuration is always saved in the VLAN database. If VTP mode is transparent, it is also saved
in the switch running configuration file, along with the VTP mode and domain name. You can then save
it in the switch startup configuration file by using the copy running-config startup-config privileged
EXEC command.
When you save VLAN and VTP configuration in the startup configuration file and reboot the switch, the
configuration is determined in these ways:
• If both the VLAN database and the configuration file show the VTP mode as transparent and the
VTP domain names match, the VLAN database is ignored. The VTP and VLAN configurations in
the startup configuration file are used. The VLAN database revision number remains unchanged in
the VLAN database.
• If the VTP mode is server, or if the startup VTP mode or domain names do not match the VLAN
database, the VTP mode and the VLAN configuration for the first 1005 VLANs use VLAN database
information.
• If the image on the switch or the configuration file is earlier than Cisco IOS Release 12.1(9)EA1,
the switch reboots with information in the VLAN database.
The following are the results of using the no vlan commands:
• When the no vlan vlan-id form is used, the VLAN is deleted. Deleting VLANs automatically resets
to zero any other parent VLANs and translational bridging parameters that refer to the deleted
VLAN.
• When the no vlan vlan-id bridge form is used, the VLAN source-routing bridge number returns to
the default (0). The vlan vlan-id bridge command is used only for FDDI-NET and Token Ring-NET
VLANs and is ignored in other VLAN types.
• When the no vlan vlan-id media form is used, the media type returns to the default (ethernet).
Changing the VLAN media type (including the no form) resets the VLAN MTU to the default MTU
for the type (unless the mtu keyword is also present in the command). It also resets the VLAN parent
and translational bridging VLAN to the default (unless the parent, tb-vlan1, or tb-vlan2 are also
present in the command).
• When the no vlan vlan-id mtu form is used, the VLAN MTU returns to the default for the applicable
VLAN media type. You can also modify the MTU using the media keyword.
• When the no vlan vlan-id name vlan-name form is used, the VLAN name returns to the default
name (VLANxxxx, where xxxx represent four numeric digits [including leading zeros] equal to the
VLAN ID number).
Release Modification
12.0(5.2)WC(1) This command was introduced.
12.1(13)EA1 The value for vlan-id variable was changed.
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