Troubleshooting VTP Connectivity
After connecting your switches with crossover cables, configured multiple VLANs in your network and probably the lights are green at both ends…yet; you can still receive an error message if the VTP configuration on the switches is not right.
That means the switches will not share VLAN information.
Let’s see and troubleshoot common VTP problems on a network. Study the output of the switched network below:
Incompatible VTP Versions
VTP versions 1 and 2 are incompatible with each other. Switches that only support version 1 cannot participate in the VTP domain along with version 2 switches.
If your network contains switches that support only version 1, you need to manually configure the version 2 switches to operate in version 1 mode or vice versa.
You can use the show VTP Status command to view what version your vtp enabled switches are running on as above displayed. It shows that switches 1 and 2 runs the version 1, while switch 3 runs the version 2. This means they are incompatible on the same network and will require you to configure SW1 and SW2 with version 2.
VTP Version Configuration: e.g.
SW1(config)#vtp version 2
In Summary: Incompatible VTP versions
· VTP versions 1 and 2 are incompatible with each other
· Make sure all switches are running the same VTP versions