Cisco WS-C2948G-GE-TX Configuration Manual page 194

Chapter 9 Configuring VTP
Understanding How VTP Version 3 Works
Figure 9-4 VTP Version 3: Partitioned VTP Domain
Domain Cisco Domain Cisco
Primary Server X Primary Server Y
Partitions exist because of discrepancies in the domain configuration that cannot automatically be
resolved by VTP. Partitions are the result of a misconfiguration or an independent configuration of a
temporarily disconnected part of the domain. This behavior of VTP version 3 protects the domain from
accepting a conflicting configuration after the insertion of a misconfigured switch. If a new switch is
added to a domain, it will not propagate its configuration until you manually designate it as the new
primary server.
For information on using the takeover mechanism to reconfigure partitioned VTP domains, see the
"Reconfiguring a Partitioned VTP Domain" section on page 9-16.
Reconfiguring a Partitioned VTP Domain
Partitioning of a VTP domain is specific to the instance; one instance may be partitioned while another
might not be partitioned. In VTP version 3, you are required to remove any partitions because the
protocol cannot determine which primary server has the final, desired configuration. Figure 9-5 shows a
VTP domain that has been divided into four partitions for one specific VTP instance.
Catalyst 4500 Series, Catalyst 2948G, Catalyst 2948G-GE-TX, and Catalyst 2980G Switches Software Configuration Guide—Release 8.2GLX
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