Network Layer 2 discovery on latest OPManager release

Network Layer 2 discovery on latest OPManager release

Hi,
 
I installed the latest 8720 release. I added several switches and routers that are connected eachother. I selected one layer3 device but I can see only one switch connected to this device.
How the Layer 2/3 discovery works?
What I need to configure on the devices?
What are the vendor currently supported?
What if I have Cisco devices separated by a Juniper firewall (let's say)?
 
Thanks in advance for your support.
 
Roberto D.

                  New to ADSelfService Plus?