VTP Domain Name Error and Solution
A VTP domain consists of one or more switches interconnected together under the same administrative responsibility sharing the same VTP domain name.
An improperly configured VTP domain affects VLAN synchronization between switches. That means they will never share VLAN information. A switch drops any wrong VTP advertisement it receives, even if it contains legitimate configuration information.
To avoid incorrect VTP domain name configuration, it is recommended that you set the VTP domain name to one of the sever switch. All other switches in the same VTP domain will accept and automatically configure their VTP domain name when they receive the first VTP summary advertisement.