Zitat von marzli2
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Understanding and Configuring VLAN Trunk Protocol (VTP)* [Virtual LANs/VLAN Trunking Protocol (VLANs/VTP)] - Cisco Systems
Hier habe ich noch etwas gefunden.
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How a Recently Inserted Switch Can Cause Network Problems
Note: In order to see a Flash demonstration of this problem, see the Flash Animation: VTP section of this document.
This problem occurs when you have a large switched domain that is all in the same VTP domain, and you want to add one switch in the network.
This switch was previously used in the lab, and a good VTP domain name was entered. The switch was configured as a VTP client and was connected to the rest of the network. Then, you brought the ISL link up to the rest of the network. In just a few seconds, the whole network was down. What can have happened?
The configuration revision number of the switch that you inserted was higher than the configuration revision number of the VTP domain. Therefore, your recently introduced switch, with almost no configured VLANs, erased all VLANs through the VTP domain.
This happens whether the switch is a VTP client or a VTP server. A VTP client can erase VLAN information on a VTP server. You can tell that this has happened when many of the ports in your network go into inactive state but continue to be assigned to a nonexistent VLAN.
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