Cisco 4506-E Software Guide - Page 178
Understanding the VTP Domain, Understanding VTP Modes
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Understanding How VTP Version 1 and Version 2 Work Chapter 9 Configuring VTP These sections describe how VTP works: • Understanding the VTP Domain, page 9-2 • Understanding VTP Modes, page 9-2 • Understanding VTP Advertisements, page 9-3 • Understanding VTP Version 2, page 9-3 • Understanding VTP Pruning, page 9-4 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, and IEEE 802.10. 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: • 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. Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 9-2 78-15486-01