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Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide
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Chapter 8      Configuring VLANs
Using VTP
Configuring VTP Server Mode
When a switch is in VTP server mode, you can change the VLAN configuration 
and have it propagated throughout the network. 
Beginning in privileged EXEC mode, follow these steps to configure the switch 
for VTP server mode:
Command Purpose
Step 1
vlan database Enter VLAN database mode.
Step 2
vtp domain domain-name  Configure a VTP administrative-domain name. 
The name can be from 1 to 32 characters.
All switches operating in VTP server or client mode under 
the same administrative responsibility must be configured 
with the same domain name.
Step 3
vtp password password-value (Optional) Set a password for the VTP domain. The 
password can be from 8 to 64 characters.
If you configure a VTP password, the VTP domain does 
not function properly if you do not assign the same 
password to each switch in the domain.
Step 4
vtp server Configure the switch for VTP server mode (the default).
Step 5
exit Return to privileged EXEC mode.
Step 6
show vtp status Verify the VTP configuration.
In the display, check the VTP Operating Mode and the VTP 
Domain Name fields.