EPHRAIM MANI Wed, 07/25/2007 - 16:46
User Badges:
  • Bronze, 100 points or more

What is that can you brief us more on this or what exactly you require here.

Thanks EM-

sungjin78 Wed, 07/25/2007 - 16:57
User Badges:

Ok, Sorry

We use 3550-24SMI switch.

Today Ios Upgrade


Upgrade before


Ios Upgrade After

Duplex mismacth happen




B:A/A half operation

ios upgrade before no duplex mismatch

ios upgrade after duplex mismatch happen

We action


No happen duplex mismatch Configure change after



B:AUTO/AUTO HALF opreation

B:100/FULL change Configure after no happen

Pavel Bykov Wed, 07/25/2007 - 22:43
User Badges:
  • Silver, 250 points or more

Set both sides to A/A, or set your both sides to 100/F (or 1000/F if it's a Gigabit port)

Duplex is negotiated at the start. When you are using AUTO (A/A), there is negotiation, but when you have manual settings (100/F), no negotiation is taking place from that side!

I.E. Only side with A/A will negotiate duplex.

Negotiation implementation is not very consistent throughout vendors. So i would recommend switching to 100/F or 1000/F whenever you would experience problems.

I think the problem you got was because of switch reload, not because of switch upgrade. It was just luck that port got correct settings in the case before.


This Discussion