Jun 11 11:23:16: %SW_VLAN-4-VTP_USER_NOTIFICATION: VTP protocol user notification: A received VTP update has the same version number as the VTP database of this switch but different database contents. The update is being dropped. This may occur if the database is updated while a part of the network is down.
Re: %SW_VLAN-4-VTP_USER_NOTIFICATION on Catalyst 4000
it seems your switch is receiving VTP update from the neighbour which has the same config number but different content.
You should check VLANs on these two switches and find the difference.
Then decide which VLAN database is correct - i.e. find the VTP server with the correct VLAN database. Make any change in VLAN database on this switch(add an empty VLAN, e.g.). It will increase the config revision number and force all switches in the VTP domain to synchronize with this VLAN database.
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