Configuring VTP

VTP Modes

Note Before adding a VTP client switch to a VTP domain, always verify that its VTP configuration revision number is lower than the configuration revision number of the other switches in the VTP domain. Switches in a VTP domain always use the VLAN configuration of the switch with the highest VTP configuration revision number. If you add a switch that has a revision number higher than the revision number in the VTP domain, it can erase all VLAN information from the VTP server and VTP domain.

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 sent over all IEEE trunk connections, including IEEE 802.1Q. VTP dynamically maps VLANs with unique names and internal index associates across multiple LAN types. Mapping eliminates excessive device administration required from network administrators.

If you configure a switch for VTP transparent mode, you can create and modify VLANs, but the changes are not sent to other switches in the domain, and they affect only the individual switch. However, configuration changes made when the switch is in this mode are saved in the switch running configuration and can be saved to the switch startup configuration file.

Related Topics

Adding a VTP Client Switch to a VTP Domain, on page 32

VTP Modes

Table 4: VTP Modes

VTP Mode

Description

VTP server

In VTP server mode, you can create, modify, and delete VLANs, and specify other

 

configuration parameters (such as the VTP version) for the entire VTP domain. VTP servers

 

advertise their VLAN configurations to other switches in the same VTP domain and

 

synchronize their VLAN configurations with other switches based on advertisements received

 

over trunk links.

 

VTP server is the default mode.

 

In VTP server mode, VLAN configurations are saved in NVRAM. If the switch detects a

 

failure while writing a configuration to NVRAM, VTP mode automatically changes from

 

server mode to client mode. If this happens, the switch cannot be returned to VTP server

 

mode until the NVRAM is functioning.

VTP client

A VTP client functions like a VTP server and transmits and receives VTP updates on its

 

trunks, but you cannot create, change, or delete VLANs on a VTP client. VLANs are

 

configured on another switch in the domain that is in server mode.

 

In VTP versions 1 and 2 in VTP client mode, VLAN configurations are not saved in NVRAM.

 

In VTP version 3, VLAN configurations are saved in NVRAM in client mode.

Catalyst 2960-XR Switch VLAN Configuration Guide, Cisco IOS Release 15.0(2)EX1

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Cisco Systems WSC2960XR48FPSI manual VTP Modes, Related Topics, VTP Mode Description
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WSC2960XR48FPSI specifications

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