Configuring VTP

VTP Advertisements

VTP Mode

Description

VTP

VTP transparent switches do not participate in VTP. A VTP transparent switch does not

transparent

advertise its VLAN configuration and does not synchronize its VLAN configuration based

 

on received advertisements. However, in VTP version 2 or version 3, transparent switches

 

do forward VTP advertisements that they receive from other switches through their trunk

 

interfaces. You can create, modify, and delete VLANs on a switch in VTP transparent mode.

 

In VTP versions 1 and 2, the switch must be in VTP transparent mode when you create

 

extended-range VLANs. VTP version 3 also supports creating extended-range VLANs in

 

client or server mode.

 

In VTP versions 1 and 2, the switch must be in VTP transparent mode when you create

 

private VLANs and when they are configured, you should not change the VTP mode from

 

transparent to client or server mode. VTP version 3 also supports private VLANs in client

 

and server modes. When private VLANs are configured, do not change the VTP mode from

 

transparent to client or server mode.

 

When the switch is in VTP transparent mode, the VTP and VLAN configurations are saved

 

in NVRAM, but they are not advertised to other switches. In this mode, VTP mode and

 

domain name are saved in the switch running configuration, and you can save this information

 

in the switch startup configuration file by using the copy running-configstartup-config

 

privileged EXEC command.

 

In a switch stack, the running configuration and the saved configuration are the same for

 

all switches in a stack.

VTP off

A switch in VTP off mode functions in the same manner as a VTP transparent switch, except

 

that it does not forward VTP advertisements on trunks.

Related Topics

Configuring VTP Mode, on page 24

Example: Configuring the Switch as a VTP Server, on page 35

VTP Advertisements

Each switch in the VTP domain sends periodic global configuration advertisements from each trunk port to a reserved multicast address. Neighboring switches receive these advertisements and update their VTP and VLAN configurations as necessary.

Because trunk ports send and receive VTP advertisements, you must ensure that at least one trunk port is configured on the switch stack and that this trunk port is connected to the trunk port of another switch. Otherwise, the switch cannot receive any VTP advertisements.

VTP advertisements distribute this global domain information:

•VTP domain name

•VTP configuration revision number

•Update identity and update timestamp

•MD5 digest VLAN configuration, including maximum transmission unit (MTU) size for each VLAN

 

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

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Cisco Systems WSC2960XR48FPSI manual VTP Advertisements, Vtp
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WSC2960XR48FPSI specifications

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