VTP Operation
VTP advertisements are ?¬‚ooded throughout the management domain. VTP advertisements
are sent every 5 minutes or whenever VLAN con?¬?gurations change. Advertisements are
transmitted over the default VLAN (VLAN 1) using a multicast frame. A con?¬?guration
revision number is included in each VTP advertisement. A higher con?¬?guration revision
number indicates that the VLAN information being advertised is more current than the
stored information. Figure 2-12 illustrates this operation.
Figure 2-12 VTP Operation
CAUTION The erase startup-con?¬?g command does not affect the vlan.dat ?¬?le on
Cisco IOS switches. VTP clients with a higher con?¬?guration revision number can
overwrite VLANs on a VTP server in the same VTP domain. Delete the vlan.dat ?¬?le and
reload the switch to clear the VTP and VLAN information. See documentation for your
speci?¬?c switch model to determine how to delete the vlan.dat ?¬?le.
1. Add New VLAN
2. Rev 3 Rev 4
Client Client
Server 4 4
3. Rev 3 Rev 4
4. Sync New VLAN
Information
3. Rev 3 Rev 4
4. Sync New VLAN
Information
Implementing VLANs and Trunks 29
One of the most critical components of VTP is the con?¬?guration revision number.
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