VTP domain (also called a VLAN management domain) consists of one
switch or several interconnected
switch stacks under the same administrative
responsibility sharing the same VTP domain name. A
switch can be in only one VTP domain. You
make global VLAN configuration changes for the domain.
By default, the
switch is in the VTP no-management-domain
state until it receives an advertisement for a domain over a trunk link (a link
that carries the traffic of multiple VLANs) or until you configure a domain
name. Until the management domain name is specified or learned, you cannot
create or modify VLANs on a VTP server, and VLAN information is not propagated
over the network.
switch receives a VTP advertisement over a
trunk link, it inherits the management domain name and the VTP configuration
revision number. The
switch then ignores advertisements with a
different domain name or an earlier configuration revision number.
you make a change to the VLAN configuration on a VTP server, the change is
propagated to all
switches in the VTP domain. VTP advertisements
are sent over all IEEE trunk connections, including IEEE 802.1Q. VTP dynamically maps VLANs with unique names and
internal index associates across multiple LAN types. Mapping eliminates
excessive device administration required from network administrators.
If you configure a
switch for VTP transparent mode, you can
create and modify VLANs, but the changes are not sent to other
switches in the domain, and they affect only
switch. However, configuration changes made
switch is in this mode are saved in the
switch running configuration and can be saved
switch startup configuration file.