How can a create a connection between two KVM private network? [closed]

I have two KVM node. In both sever there is a bridge connection for the interface prv1 with network 192.168.15.0/28 and in other KVM node there is a bridge connection for the interface prv1 with network 192.168.15.16/28 . I can create a VM from both interface. But, how can I make a connection so that 192.168.15.0/28 network can be reachable to 192.168.15.16/28 ?

Below is my network diagram in which I want access between VM1 and VM2. Any guide will be appreciate. enter image description here

It's not clear what you are asking for. Your diagrams shows VMs are actually having IPs from the 10.10.15.X range which you aren't mentioning in your question. Besides you didn't told if the prv1 interfaces from both nodes are physically connected to each other.

Do you need a connection for VMs or for the bridges prv1 on the physical nodes? If later, you will a router of some sort between those 2 subnetworks or a dirty hack with onlink routes providing you really have physical connection between prv1 interfaces on your hosts (physical nodes).

I might update my answer once you will update your question to make it more obvious what you require to achieve.