VTP can only manage VLANs 1 - 1005 (not 1025 - 4094).
Switches that share the VTP domain name will allow global VLAN config changes.
Switches default to VTP server mode and can learn their domain from a
trunk port. Switches will ignore advertisements with different VTP domains
or with earlier config revision numbers. Changes made to the VLAN config on
a VTP server get propogated to all switches in the VTP domain via all
trunk connections (ISL, 802.1Q, etc).
set vtp mode transparent
will allow VLANs to be created and modified on an individual switch
instead of on all the switches in the VTP domain.
Switches can operate in one of three VTP modes: server, client, transparent.
- Server - In VTP server mode, you can create, modify, and delete
VLANs and specify other configuration parameters (such as VTP version
and VTP pruning) for the entire VTP domain. VTP servers advertise
their VLAN configuration to other switches in the same VTP domain and
synchronize their VLAN configuration with other switches based on
advertisements received over trunk links. VTP server is the default
mode.
- Client - VTP clients behave the same way as VTP servers, but you
cannot create, change, or delete VLANs on a VTP client.
- Transparent - VTP transparent switches do not participate in VTP.
A VTP transparent switch does not advertise its VLAN configuration
and does not synchronize its VLAN configuration based on received
advertisements. However, in VTP version 2, transparent switches do
forward VTP advertisements that they receive out their trunk
ports.
Some example VTP commands
set vtp domain testing123
ser vtp mode server
set vtp passwd stay-out
set vtp domain company-name
set vtp mode client
set vtp mode transparent
show vtp domain