Re: [foxboro] network storm

From: "Chaiket, Thom" <tchaiket@xxxxxxxx>
To: <foxboro@xxxxxxxxxxxxx>
Date: Tue, 24 Feb 2009 11:59:32 -0500
Hi List--

We are seeing the same symptoms (synchronized blinking of CPU/MGR/RPS
lights on one MESH switch) described in the earlier post of this chain.
However, powering down/up didn't do the trick for us.  

I reached out to Tech Support and was informed that our switches fell
into that category affected by the power supply issue (a notification
was out sometime last year, and our field technician then verified that
these switches were okay before they were installed.  ???)  All in all,
we are going to get these switches replaced VERY SOON.

Other than cycling power, has anyone done anything successfully to get
the switches back up temporarily or otherwise?

Thanks,

t


-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx]
On Behalf Of Hicks, Gaylon F
Sent: Monday, February 09, 2009 12:44 pm
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] network storm

Thanks Mike.  I think I have officially reached the limits of my
knowledge.  

But, having never let not knowing stop me from speaking (or typing),
I'll throw this out.  We had the COMEX Multicast Suppession limits on
our network set up 64Kb/sec, and it worked fine, and was pretty much
impervious to a COMEX multicast storm (the silver bullet for I/A
processors).  We upped that to 128 Kb/sec while troubleshooting a
problem that ultimately ended up being a bad ZCP, but based on the
network sniffing we did on our system, 64kb/sec is more than enough
bandwidth for COMEX Multicast for our application.  Your mileage may
vary.

To the best of my knowledge (see "limits" above), the COMEX multicast is
only used when initially opening displays on a workstation, and when
ZCPs/FCMs boot up (not sure about that one).  Otherwise, the COMEX
multicast traffic is really, really, really, low.  But, as Mike stated
below, if the normal COMEX multicast traffic doesn't get through, you
are going to have some issues, primarily with workstations.

Ain't switches fun?

Thanks,
Gaylon



 
 
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Re: [foxboro] network storm

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