If you start with two independent SDNs with ER605/OC200/TL-SG22110P each with their own ISP.

• SDN#1 has a VLAN 31 (192.168.31.1/24)
• SDN#2 has a VLAN 32 (192.168.32.1/24)

• On SDN#1 if the managed switch provided VLAN 31 (untagged) to Server 1A and Camera 1B then they should be able to communicate with each other (e.g., the Server record the Camera). Devices 1A and 1B could access the internet via Router ER605#1.
• Likewise SDN #2 if the managed switch provided VLAN 32 (untagged) to Camera 2A and 2B then they should be able to communicate with each other as well. Devices 2A and 2B could access the internet via Router ER605#2.

• QUESTION: If the two SDN were nearby, how could VLAN 31 and VLAN 32 be interconnected to allow Server 1A to record Cameras 2A and 2B?
• Could a simple switch (TL-SG108) be added combining the untagged networks VLAN 31 and VLAN32 without causing problems in either SDN thus allowing Server 1A see Cameras 2A and 2B? What might the complications be?
  • Could the subnet mask for the Devices be made wider without causing problems? (e.g., router problems)
  • Seems like the DHCP ranges for each router on their VLAN should be easily set up to not cause problems?