[c-nsp] autonegotiation fail

[Hank Nussbacher]

On Thu, 22 Sep 2005, Vincent De Keyzer wrote:

See:
http://kb.pert.switch.ch/cgi-bin/twiki/view/PERTKB/DuplexAndAutoNeg
as well as Cisco specific:
http://www.cisco.com/warp/public/473/46.html

-Hank

> Welcome to the club! I guess you also have noticed the CRC errors on the
> interface counters.
>
> I would say that forcing to 100/FD is usually a good idea on Cisco trunks
> (switch/swith but sometimes also switch/some routers, like the 7206 VXR).
>
> On access ports, you'd better leave it to auto-negotiation. Workstations
> usually negotiate better with a Cisco than another Cisco (conflicting
> interests I assume :-).
>
> Vincent
>
>
> > -----Original Message-----
> > From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
> > bounces at puck.nether.net] On Behalf Of Horváth Szabolcs
> > Sent: jeudi 22 septembre 2005 17:23
> > To: cisco-nsp at puck.nether.net
> > Cc: Timár Csaba
> > Subject: [c-nsp] autonegotiation fail
> >
> > Hello!
> >
> > We have many switches in our network: 2912MfXL, 2924CXLv, 2924MXL,
> > 2924XLv,
> > 295024, 295024C, 3548XL, wsc1900LiteFx. The software versions are very
> > heterogenous.
> >
> > We observed that in some cases the autonegotiation between Cisco Catalyst
> > switches failed. For example:
> >
> > We did the measures with iperf (dast.nlanr.net/Projects/Iperf/).
> > The results:
> > 	individual test: ~85 Mbit/s up, ~85 Mbit/s down
> > 	bidirectional test: ~80 Mbit/s up, ~7 Mbit/s down(!)
> >
> > So we set the link to 100 Mbit/full duplex by manually.
> > The results:
> > 	bidirectional test: ~85 Mbit/s up, ~85 Mbit/s down(!)
> >
> > We want to force every switch-switch connection to 100 Mbit/full duplex.
> >
> > What do you suggest?
> > What are the common pitfalls in this situation?
> >
> > Thanks for your reply,
> > Szabolcs Horvath
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>
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