Discovering devices on a network

[augustin]

I've installed OSM 3.0 Evaluation copy and cannot discover any device on my network.
On the seed device I mentioned IP address of the stack ( 8 units of Nortel Baystack 450-24T )
When I try to discover network I receive the message:
'The seed device appears to be isolated. No links are visible through SNMP'.
The stack is configured at SNMP configuration with
Trap #1 IP Address = IP address of my station ( where is installed OSM 3.0 ), Community String = public Authentication Trap: Enabled and AutoToplogy:Enabled

 

[betafork]

I had the same problem before. It stopped after I upgraded the devices. Sometimes it actually helped reinstalling the same firmware version.