VDOM AND ROOT INTERCOMMUNICATION

[Quantum_sec]

i have an urgent situation ans i need your expertise, i have implemented a vdom on my network, i had issues with one of my segments or ip blocks, i configured another root interface, but unfortunately, this new root interface is not able to communicate with some of the existing vdom's, Kindly share a guide or your support shall be appreciated.

Thanks 

[funkylicious]

https://docs.fortinet.com/document/fortigate/7.6.4/hardware-acceleration/327022/using-vlans-to-add-m...

or

https://docs.fortinet.com/document/fortigate/7.6.4/administration-guide/335646/inter-vdom-routing-co... 

[ezhupa]

When creating VDOMs on the FGT, the VDOMs itself are connected via intervdom links.
Think of it as logically separating the device into 2 virtual devices.
For communication between these VDOMs to work, you would need policies to allow the traffic from one side to the other like they were 2 separate devices.
The below link that was added by @funkylicious is very useful in understanding the components and understanding how it works.

https://docs.fortinet.com/document/fortigate/7.6.4/administration-guide/335646/inter-vdom-routing-co...