North American Network Operators Group

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Re: iPhone and Network Disruptions ...

  • From: Adrian Chadd
  • Date: Thu Jul 26 05:57:38 2007

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