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Understanding How VTP Version 1 and Version 2 Work
These sections describe how VTP works:
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Understanding the VTP Domain
A VTP domain (also called a VLAN management domain) is made up of one or more interconnected
switches that share the same VTP domain name. A switch can be configured to be in one and only one
VTP domain. You make global VLAN configuration changes for the domain using either the
command-line interface (CLI) or Simple Network Management Protocol (SNMP).
By default, the switch is in VTP server mode and is in the no-management domain state until the switch
receives an advertisement for a domain over a trunk link or you configure a management domain. You
cannot create or modify VLANs on a VTP server until the management domain name is specified or
learned.
If the switch receives a VTP advertisement over a trunk link, it inherits the management domain name
and the VTP configuration revision number. The switch ignores advertisements with a different
management domain name or an earlier configuration revision number.
If you configure the switch as VTP transparent, you can create and modify VLANs but the changes affect
only the individual switch.
When 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 transmitted out all trunk connections, including
Inter-Switch Link (ISL), IEEE 802.1Q, IEEE 802.10, and ATM LAN Emulation (LANE).
VTP maps VLANs dynamically across multiple LAN types with unique names and internal index
associations. Mapping eliminates excessive device administration that is required from network
administrators.
Understanding VTP Modes
You can configure a switch to operate in any one of these VTP modes:
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Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
10-2
Understanding the VTP Domain, page 10-2
Understanding VTP Modes, page 10-2
Understanding VTP Advertisements, page 10-3
Understanding VTP Version 2, page 10-3
Understanding VTP Pruning, page 10-4
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.
Chapter 10
Configuring VTP
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