[c-nsp] Cisco 2950 oddities with MDI-X and unicast flooding

Tony Varriale tvarriale at comcast.net
Tue Dec 23 18:27:08 EST 2008

AFAIK 2950 does not support auto mdix.

----- Original Message ----- 
From: "Frank Bulk" <frnkblk at iname.com>
To: <cisco-nsp at puck.nether.net>
Sent: Tuesday, December 23, 2008 8:25 AM
Subject: [c-nsp] Cisco 2950 oddities with MDI-X and unicast flooding

>I had a case of unicast flooding that started Thursday morning and all the
> technotes I was reading weren't helping me.  Since the Cisco 2950T-24 was 
> up
> for over two years and running 12.1(22)EA2, I thought I would upgrade it 
> to
> 12.1(22)EA11 to match all my other 2950s and reboot.
> The upgrade resolved the unicast flooding (can anyone explain how/why that
> should be?) but I lost my inter-office transport link on the Fa0/1 
> (10/100).
> The switch said "down" and the transport gear said "down".  Very strange.
> Seeing that other switches into this transport gear had cross-over cables, 
> I
> snapped in a cross-over cable and voila, the link went up.  Anyone see 
> that
> before?
> Frank
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