Vtp Advertisements - Cisco WS-C3550-12G Software Configuration Manual

Multilayer switch

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Creating and Maintaining VLANs

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 and that this trunk port is connected to the trunk port of a second

switch. Otherwise, the switch cannot receive any VTP advertisements. For more information on

trunk ports, see the

VTP advertisements distribute this global domain information:

VTP advertisements distribute this VLAN information for each configured VLAN:

"Understanding VLAN Trunks" section on page

VTP domain name

VTP configuration revision number

Update identity and update timestamp

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

Frame format

VLAN IDs (ISL and 802.1Q)

Additional VLAN configuration information specific to the VLAN type

Catalyst 3550 Multilayer Switch Software Configuration Guide

Using the VLAN Trunking Protocol

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Catalyst 3550