Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Community Member

duplex mismatch issue

HI

Now duplex mismatch issue

power reset after

3 REPLIES

Re: duplex mismatch issue

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

Thanks EM-

Community Member

Re: duplex mismatch issue

Ok, Sorry

We use 3550-24SMI switch.

Today Ios Upgrade

c3550-ipservicesk9-mz.122-25.SEE3.bin

Upgrade before

c3550-i9q3l2-mz.121-13.EA1c.bin

Ios Upgrade After

Duplex mismacth happen

End-to-End

1case

A:100/FULL

B:A/A half operation

ios upgrade before no duplex mismatch

ios upgrade after duplex mismatch happen

We action

A:A/A

No happen duplex mismatch Configure change after

2case

A:100/FULL

B:AUTO/AUTO HALF opreation

B:100/FULL change Configure after no happen

Silver

Re: duplex mismatch issue

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.

135
Views
4
Helpful
3
Replies
CreatePlease to create content