3COM 3300 is not accepting connections from hubs.

[sanmcp]

I've just RMA'ed this Superstack II 3300 and got it back two days ago. It works except it doesn't accept traffics from hubs at all. Switch to Switch connections works fine.

For example, I have a 3com 24 port dual speed hub. If I connect a straight through cable to one of the ports on the hub and connect the other end to one of the ports on 3300 switch. No traffic is flowing between them. However, If connect the 3300 to any of the switches, it works fine.

I think I recevied a faulty unit. Or is there any setting that would restrict traffic from hubs but allow switch traffics?

Thanks

 

[sanmcp]

Just to clarify:

This set up works fine:
Switch-to-3300 or 3300-to-switch

This setup is not working:
3300-to-hub or 3300-to-hub

 

[sanmcp]

Never mind. I figured out. The hub's port 24 is configured as the uplink. I didn't see crossover and straight through sign right next to the port 24.