Cisco WS-C2980G-A Software Guide - Page 195
VTP Version 3 Databases, Transparent and VTP Off Modes
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Chapter 9 Configuring VTP Understanding How VTP Version 3 Works Primary Server • A VTP server reverts to client mode if it cannot store the configuration in NVRAM. • A VTP version 3 secondary server can issue a takeover to become a primary server. The primary server can initiate or change the VTP configuration. To reach the primary server state, you must issue a successful takeover from the switch. The takeover mechanism is propagated to the entire domain. All other potential primary servers in the domain resign to secondary server mode to ensure that there is only one primary server in the VTP domain. You only need the primary server when the VTP configuration for any instance needs to be modified. A VTP domain can operate with no active primary server as the secondary servers ensure persistence of the configuration over reloads. The primary server state is exited due to the following reasons: • A switch reload. • A high-availability switchover between the active and redundant supervisor engines. • A takeover from another server. • A change in the mode configuration. • Any VTP domain configuration change (such as version, domain name, or domain password). Transparent and VTP Off Modes In VTP version 3, the transparent mode is specific to the instance. The off mode in VTP version 3 is similar to the previous VTP versions and is not specific to an instance. In both modes, you are allowed to configure locally the features that VTP is controlling. This feature configuration will also appear in the running configuration (if applicable). The feature stores its local configuration in the same NVRAM block that is used by VTP. Consequently, all NVRAM handling for the feature happens through VTP whether or not the switch is transparent to the feature. In VTP transparent mode, all VTP messages that are received by the switch are still flooded. In VTP off mode, the VTP messages are dropped on the trunks. VTP Version 3 Databases VTP version 1 and VTP version 2 are tied to VLAN information. VTP version 3 is designed to distribute any kind of configuration (referred to as a database) over a VTP domain. Note In software release 8.1(1), the only supported database propagation is for the VLAN database. VTP version 3 databases are described in the following sections: • Valid Databases, page 9-20 • Database Revision Number, page 9-20 • Interaction with VTP Version 1 and VTP Version 2, page 9-21 • Limitations, page 9-21 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 9-19
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