netstat -ni - A lot of collisions...

sthaug at sthaug at
Mon Nov 6 21:24:54 UTC 2006

> I've never paid much attention to what ifconfig says, or what
> managed switches say, as far as speed or duplex negotiation go.
> Most vendors do not play well together.  I'll repeat that because
> it needs repeating: most vendors do not play well together.
> Example: anyone familiar with Cisco Catalysts knows of the
> long-standing problem with auto-neg which ultimately requires
> both ends of the connection be set to 100/full.

I disagree. Autonegotiation used to be a problem, and we used to force
all links to 100/full. But that was 3-4 years ago. These days, the
situation is much improved - and in most cases autonegotiation "just
works". That includes *lots* of Cisco Catalyst switches.

Steinar Haug, Nethelp consulting, sthaug at

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