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Catalyst 3750-X and 3560-X Switch Software Configuration Guide
OL-21521-01
Chapter 16 Configuring VTP
Configuring VTP

Configuring a VTP Version 3 Primary Server

Beginning in privileged EXEC mode, follow these steps on a VTP server to configure it as a VTP
primary server (version 3 only), which starts a takeover operation:
This example shows how to configure a switch as the primary server for the VLAN database (the default)
when a hidden or secret password was configured:
Switch# vtp primary vlan
Enter VTP password: mypassword
This switch is becoming Primary server for vlan feature in the VTP domain
VTP Database Conf Switch ID Primary Server Revision System Name
------------ ---- -------------- -------------- -------- --------------------
VLANDB Yes 00d0.00b8.1400=00d0.00b8.1400 1 stp7
Do you want to continue (y/n) [n]? y
Enabling the VTP Version
VTP version 2 and version 3 are disabled by default.
• When you enable VTP version 2 on a switch, every VTP version 2-capable switch in the VTP
domain enables version 2. To enable VTP version 3, you must manually configure it on each switch.
• With VTP versions 1 and 2, you can configure the version only on switches in VTP server or
transparent mode. If a switch is running VTP version 3, you can change to version 2 when the switch
is in client mode if no extended VLANs exist, no private VLANs exist, and no hidden password was
configured.
Caution VTP version 1 and VTP version 2 are not interoperable on switches in the same VTP domain. Do not
enable VTP version 2 unless every switch in the VTP domain supports version 2.
• In TrCRF and TrBRF Token ring environments, you must enable VTP version 2 or VTP version 3
for Token Ring VLAN switching to function properly. For Token Ring and Token Ring-Net media,
disable VTP version 2 must be disabled.
Command Purpose
Step 1 vtp primary-server [vlan | mst]
[force]
Change the operational state of a switch from a secondary server (the
default) to a primary server and advertise the configuration to the domain.
If the switch password is configured as hidden, you are prompted to reenter
the password.
• (Optional) vlan—Select the VLAN database as the takeover feature.
This is the default.
• (Optional) mst—Select the multiple spanning tree (MST) database as
the takeover feature.
• (Optional) force—Entering force overwrites the configuration of any
conflicting servers. If you do not enter force, you are prompted for
confirmation before the takeover.