Nortel 5510'a

[silverfoxm3]

Customer has (3) 5510's each on different soft versions:
3.01, 4.2, 5.1

What versions at minimum (or at best) do these switches need to be running on for all 3 to talk to eachother?

 

[biv343]

I'd put them all on 5.1X or 6.X. Regardless of release, they all need to be on the same software image to stack them.