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Chapter 14
Configuring VTP
Passwords
You can configure a password for the VTP domain, but it is not required. If you do configure a domain
password, all domain switches must share the same password and you must configure the password on
each switch in the management domain. Switches without a password or with the wrong password reject
VTP advertisements.
If you configure a VTP password for a domain, a switch that is booted without a VTP configuration does
not accept VTP advertisements until you configure it with the correct password. After the configuration,
the switch accepts the next VTP advertisement that uses the same password and domain name in the
advertisement.
If you are adding a new switch to an existing network with VTP capability, the new switch learns the
domain name only after the applicable password has been configured on it.
When you configure a VTP domain password, the management domain does not function properly if you
Caution
do not assign a management domain password to each switch in the domain.
VTP Version
Follow these guidelines when deciding which VTP version to implement:
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Configuration Requirements
When you configure VTP, you must configure a trunk port on the switch stack so that the switch can send
and receive VTP advertisements to and from other switches in the domain.
For more information, see the
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 switch must be in VTP transparent
mode.
VTP does not support private VLANs. If you configure private VLANs, the switch must be in VTP
transparent mode. When private VLANs are configured on the switch, do not change the VTP mode from
transparent to client or server mode.
78-16180-02
All switches in a VTP domain must run the same VTP version.
A VTP Version 2-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 Version 2 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 Version 2. If there is a Version 1-only switch, it does not exchange VTP
information with switches that have 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.
"Configuring VLAN Trunks" section on page
Catalyst 3750 Switch Software Configuration Guide
Configuring VTP
13-16.
14-9
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