Chapter 8 Configuring VLANs
VLANs in the VTP Database
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Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide
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Configuring VLANs in the VTP Database
You use the CLI vlan database VLAN database command to add, change, and
delete VLANs. In VTP server or transparent mode, commands to add, change, and
delete VLANs are written to the file vlan.dat, and you can display them by
entering the privileged EXEC show vlan command. The vlan.dat file is stored in
nonvolatile memory. The vlan.dat file is upgraded automatically, but you cannot
return to an earlier version of Cisco IOS after you upgrade to this release.
Caution You can cause inconsistency in the VLAN database if you attempt to manually
delete the vlan.dat file. If you want to modify the VLAN configuration or VTP,
use the VLAN database commands described in the Catalyst 2900 Series XL
and Catalyst 3500 Series XL Command Reference.
You use the interface configuration command mode to define the port membership
mode and add and remove ports from VLANs. The results of these commands are
written to the running-configuration file, and you can display the file by entering
the privileged EXEC show running-config command.
Note VLANs can be configured to support a number of parameters that are not
discussed in detail in this section. For complete information on the commands
and parameters that control VLAN configuration, refer to the
Catalyst 2900 Series XL and Catalyst 3500 Series XL Command Reference.
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