4250/4950 lockup problems

[m4sherman]

I have 5 4250's I'm trying to connect to a 4950 switch. I can connect 4 of the 4250's to the 4950 and they work fine, but when I try to add the 5th 4250, the whole group locks up. I've tried connecting via the "UP/Down" ports and via the numbered ports. I have fast tree spanning enabled.

Any ideas?

Thanks,

Kerry

 

[bkonner]

Howdy,

I had trouble with my 4950 switches last year. I did a firmware upgrade which resolved the problem.

Bkonner

 

[kipcc]

If I remeber correctly, the most number of 4200 in a stack is 4. That could be the reason, couldn't it?