Cisco WS-C2960-24TC-L Software Guide - Page 193
VTP Version 3: Reconfiguring a Partitioned VTP Domain
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Chapter 9 Configuring VTP Understanding How VTP Version 3 Works Figure 9-5 VTP Version 3: Reconfiguring a Partitioned VTP Domain VTP Instance Partition Y Partition W Partition Z 94283 78-15486-01 Partition X In Figure 9-5, server X has the correct configuration for the domain. To reconfigure this partitioned VTP domain, you need to issue a takeover message from server X to the entire domain, advertising server X as the new primary server for this specific instance. All switches in the domain will then lock onto primary server X and will only accept instance configuration updates that are initiated by server X. Therefore, all switches in the domain will synchronize their VTP configuration to server X for that instance. Initiating the takeover mechanism is a critical operation due to the following: • The takeover erases conflicting configurations that are potentially stored on other primary servers in the VTP domain. VTP lists all the switches with conflicting configurations (when you enter the show vtp conflicts command) and prompts you for confirmation before taking over (a server has conflicting information if it belongs to the same VTP domain but has a different primary server). • The takeover leaves this switch (server X in Figure 9-5) as the only primary server controlling the VTP domain. If you have a hidden password configured, you need to reenter the password to do a takeover. Switches refuse the takeover request if they are not correctly authenticated. If no authentication is enabled, any server is able to take over. After a takeover, there should only be one primary server controlling the entire VTP domain for a particular instance. If this is not the case, it might be due to the following: • Some switches may be temporarily disconnected and unreachable when the takeover message is sent. • The takeover message might be lost on some links (however, the takeover messages are repeated to reduce this risk). In both cases, you can correct the problem by issuing additional takeover messages. For more information on takeovers, see the "Configuring a VTP Version 3 Takeover" section on page 9-28. Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 9-17
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