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

Chapter 9 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.
Note 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:
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VTP advertisements distribute this VLAN information for each configured VLAN:
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"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
VLAN.
Frame format
VLAN IDs (ISL and 802.1Q)
VLAN name
VLAN type
VLAN state
Additional VLAN configuration information specific to the VLAN type
Catalyst 3550 Multilayer Switch Software Configuration Guide
Using the VLAN Trunking Protocol
9-22.
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