18-9
Catalyst2950 and Catalyst2955 Switch Software Configuration Guide
78-11380-10
Chapter18 Configuring VTP Configuring VTP

VTP Version

Follow these guidelines when deciding which VTP version to implement:
•All switches in a VTP domain must run the same VTP version.
•A VTP version2-capable switch can operate in the same VTP domain as a switch running VTP
version 1 if version 2 is disabled on the version 2-capable switch (version 2 is disabled by default).
•Do not enable VTP version2 on a switch unless all of the switches in the same VTP domain are
version-2-capable. When you enable version 2 on a switch, all of the version-2-capable switches in
the domain enable version2. If there is a version 1-only switch, it does not exchange VTP
information with switches with version 2 enabled.
•If there are TrBRF and TrCRF Token Ring networks in your environment, you must enable VTP
version 2 for Token Ring VLAN switching to function properly. To run Token Ring and Token
Ring-Net, disable VTP version 2.

Configuration Requirements

When you configure VTP, you must configure a trunk port so that the switch can send and receive VTP
advertisements. For more information, see the “Configuring VLAN Trunks” section on page17-15.
If you are configuring VTP on a cluster member switch to a VLAN, use the rcommand privileged EXEC
command to log into the member switch. For more information about the command, refer to the
command reference for this release.
If you are configuring extended-range VLANs on the switch, the swi tch mu st be in VT P tra nsp aren t
mode.
Configuring a VTP Server
When a switch is in VTP server mode, you can change the VLAN configuration and have it propagated
throughout the network.
Note If extended-range VLANs are configured on the switch, yo u c anno t ch an ge VT P mo de to se rver. You
receive an error message, and the configuration is not allowed.
Beginning in privileged EXEC mode, follow these steps to configure the switch as a VTP server:
Command Purpose
Step1 configure terminal Enter global configuration mode.
Step2 vtp mode server Configure the switch for VTP server mode (the default).
Step3 vtp domain domain-name Configure the VTP administrative-domain name. The name can be from
1 t o 32 char acters. All switches operati ng in VTP server or client mod e
under the same administrative responsibility must be configured with the
same domain name.