Re: [foxboro] network storm

  • From: Corey R Clingo <corey.clingo@xxxxxxxx>
  • To: foxboro@xxxxxxxxxxxxx
  • Date: Thu, 5 Feb 2009 14:20:26 -0600

I'm sorry it happened to you.  I don't have a mesh system, so I obviously 
haven't experienced this.

But I have to reiterate this thought, and others are free to chime in on 
it:


*** It's not a good idea, or a good design, to cross-connect your two 
"redundant" networks. ***


We saw the issues with this on classic nodebus.  It wasn't physically 
cross-connected, but logically so, as all stations listened on both 
cables.


Mesh addresses some of those nodebus issues to be sure, though it relies 
on the switches functioning properly to do so.  What scares me about mesh 
is the unknown, potential pitfalls there.  Sounds like you ran across one.


I really wish Foxboro had not gone this route, or at least not required it 
to be the case.  I for one do not think the potential ability to ride out 
multiple network failures is worth the tradeoff in isolation of the 
redundant nets.


Corey R Clingo 
BASF Corporation






Michael Jaudon <mjaudon2@xxxxxxxxx> 
Sent by: foxboro-bounce@xxxxxxxxxxxxx
02/05/2009 01:26 PM
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Subject
[foxboro] network storm






We experienced a first for our plant site today.  We had all workstations,
on the mesh side of the network, to "smurf" out.  Upon visually checking 
our
ZCP270s I noticed that of each of the ZCP270s had gone single with it's
associated FT module gone to red/green.
Looking at the switches...we have 3 sets of switches including the root
switch.  On each of the switches the lights were all flashing rapidly and 
in
unison.  It wasn't until we cycled the power on the root switches (one at 
a
time) that the network came back.

Talking to our field service rep...he said the situation we had was a
"network storm".  The cause is unknown.

My question is has anyone ever experienced a "network storm" on a mesh
network and if so what caused it?

Our mesh network has been in operation since Oct 2008 and this is the 
first
issue we have had with it.

We are running a Mesh Network version 8.4.1.

-- 
Mike Jaudon
Tronox, LLC
Hamilton, MS

 



 
 
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