The error message similar to this appears in the logs:
%SW_VLAN-4-VTP_USER_NOTIFICATION: VTP protocol user notification: Version 1 device detected on Gi0/10 after grace period has ended.
By default the VLAN Trunking Protocol (VTP) Version on Cisco switches is Version 2 and is compatible with Version 1. This message is just a notification that indicates that there is a switch connected on port Gig0/10 that runs VTP Version 1. Everything continues to work fine, unless you run IPX, and there is nothing harmful for the switch.
In order to resolve this issue, change the VTP version with these commands.
For Cisco IOS -based switches, use these commands: