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Re: 100mbit nic: intel or 3com?



On Sun, Feb 03, 2002 at 11:35:26AM +1300, Cameron Kerr wrote:
> On Sat, 2 Feb 2002, Igor Mozetic wrote:
> >We have both 3com (905B) and Intel (EExpress Pro100) and both run fine.
> >There is only one catch with Cisco switches - they don't autonegotiate
> >with 3com, so one has to set the switch ports to 100Mb/FullDuplex.
> 
> Really???!!! Is this a targetted incompatibility? There is no good reason
> why autonegotiation would work with one type, and not another. The only
> way to tell if a NIC was from 3Com, would be to check its MAC address. I
> wonder if it would work if you change the first three octets of the MAC
> address of the NIC, as this would prove they Cisco are playing silly
> buggers. (The first three octets of a MAC address identify the
> manufacturer.)

This is a widely known and long-standing incompatibility between Cisco
and 3Com etherlike chipsets.  There's no good "reason" for it, like
most bugs.

-- 
Nathan Norman - Staff Engineer | A good plan today is better
Micromuse Ltd.                 | than a perfect plan tomorrow.
mailto:nnorman@micromuse.com   |   -- Patton

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