How to check switch port for auto-negotiation ?

I am using CISCO switch, Can I confirm it using command ?

show interface f0/1 (something like this? what do I need to look-out for ? )

The best way is to simply check your model on Cisco site, or check in the manual.Anyway it should have auto negotiation, because that is the feature switches have for many years as default.

To be sure give as the exact model of switch you are using.

You can also check for commands and output here: http://www.cisco.com/en/US/tech/tk389/tk214/technologies_tech_note09186a0080094781.shtml#auto_neg

and here: http://www.cisco.com/en/US/tech/tk389/tk214/technologies_tech_note09186a0080094781.shtml#cfg_ts

Use "set port speed 1/1 auto" for switching your port to autonegotiation. It's in such state by default.

Personally I would recommend you do NOT use autonegotiate with a Cisco switch. I have found this to be the cause of many network problems, always with Cisco switches.
I always force link speed on port and end device to ensure I have full control and avoid issues.

I tend to force 100/FD on all ports as soon as I install a new switch and do the same on the server NIC's. Using CiscoWorks allows this to propogate around the estate for larger clients.

Hope this helps
Barny

IPKON_Networks:
From WikiPedia (http://en.wikipedia.org/wiki/Autonegotiation)

In some large installations that have had to deal with negotiation issues, network staff may believe that "autonegotiation doesn't work", and consider turning it off a best-practice. This should be avoided - once autonegotiation is turned off, it will not work by definition, creating a self-enforcing problem.

gtworek,

I agree that, if the standards are followed then autonegotiation would be the best practice. I would love this to be the case as it would make life so much easier.
However, I have real, very recent examples where the entire network is set to AN and there are still negotiation failures. Setting manually is still the only reliable method to resolve the issue.
It has been down to versions of NIC, and sometimes versions of IOS on the switches (bought at the same time, and the same model yet shipped with slightly different versions!!!!).
The situation is still better than it was 10 years ago but it has by no means gone away.
I would say in the defence of the wiki article (not a fan myself) that you should consider very carefully the choice of going manual. I believe that it should be an all or nothing approach and manual is an admin overhead that some people feel is not worth it.
It is along the same lines as DHCP vs manual IP setting. Consider the overhead of going manual here.... can you support that overhead?
Barny