Referring to the diagram, Switch_2 was not there and communication between private networks was working fine.
I added Switch_2 (a layer 2 switch) to the network to extend the business network and lost communication in Site_2 private network.
We have this access list on Firewall_1 (Site_1):
access-list To_xx_inbound extended permit ip any host "IP address of Firewall_2 interface e0/1"
And I need to add another access list so that communication to the private network established by bypassing Switch_2 (managed by business network).
Appreciate your help.
Thanks,
Ali