[98216] in North American Network Operators' Group
Re: iPhone and Network Disruptions ...
daemon@ATHENA.MIT.EDU (Adrian Chadd)
Thu Jul 26 05:57:47 2007
Date: Thu, 26 Jul 2007 18:01:02 +0800
From: Adrian Chadd <adrian@creative.net.au>
To: Warren Kumari <warren@kumari.net>
Cc: North American Network Operators Group <Nanog@merit.edu>
In-Reply-To: <A64EC9AE-951D-470E-AFDA-2A295567665B@kumari.net>
Errors-To: owner-nanog@merit.edu
On Wed, Jul 25, 2007, Warren Kumari wrote:
> You have a couple of switches with STP turned off -- someone plugs in
> some random cable, forming a bridge loop....... and everything
> continues running fine, until some time in the future when it all
> goes to hell in a hand-basket. Now, I could understand the system
> remaining stable until the first broadcast / unknown MAC caused
> flooding to happen, but I have seen this system remain stable for
> anywhere from a few days to in a few weeks before suddenly exploding.
If you want to hear about something whacked along those lines - imagine
two access points which had spanning tree disabled, connected to
a pair of switches on a vlan which wasn't running stp (thanks to
platform stp limitations, the switches running pvstp and said
campus having >800 vlans), and said ap's would occasionally associate
in infrastructure mode - which would cause a broadcast storm
on that vlan and fill trunk pipes with spaf. Debugging that one was
hilarious.
Hum.
Adrian
