Cisco WS-C2980G-A Software Guide - Page 191
Partitioned VTP Domains, VTP Version 3: Primary Servers, Secondary Servers, and Clients
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Chapter 9 Configuring VTP Understanding How VTP Version 3 Works Figure 9-3 VTP Version 3: Primary Servers, Secondary Servers, and Clients VTP1/VTP2 Terminology VTP3 Terminology Server Client Is allowed to change the domain configuration Saves the configuration in NVRAM Cannot change the domain configuration Don't save the configuration in NVRAM Primary Server Secondary Server Client 94281 Partitioned VTP Domains VTP version 3 restricts the configuration rights for a domain to a unique primary server, as follows: • VTP configuration is possible only on a primary server. • The identifier (ID) of the primary server that generated the database is attached to the VTP advertisements. • A VTP switch keeps the ID of a primary server and accepts VTP database updates from its current primary server only. Because the ID of a primary server is always sent along with the VTP configuration, any switch that has a configuration also knows the corresponding primary server. As in VTP version 1 and VTP version 2, the switches that do not have a VTP configuration accept the first configuration that they receive (provided that it passes the optional authentication scheme that is described in the "VTP Version 3 Authentication" section on page 9-13). VTP version 3 switches lock on the primary server that generated their configuration and only listen to further VTP database updates from this primary server. This differs significantly from VTP version 1 and VTP version 2 where a switch would always accept a superior configuration from a neighbor in the same domain. A VTP version 3 switch only accepts a superior configuration that is from the same domain and that is generated by the same primary server. Ideally, there should be only one primary server in a VTP version 3 domain, but if there are several, the domain is partitioned in groups following the update of their respective primary server (see Figure 9-4). In Figure 9-4, the Cisco VTP domain is partitioned between switches accepting server X or server Y as a primary server. The switches that are from different partitions do not exchange database information even though they are part of the same domain. If server X changes the VTP configuration, only the left partition of the network accepts it. 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 9-15
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