Re: [foxboro] network storm

  • From: "Davis, Mike A" <mike.davis@xxxxxxxxxxxxxxxx>
  • To: <foxboro@xxxxxxxxxxxxx>
  • Date: Mon, 9 Feb 2009 08:55:25 -0500

In response to Gaylon, let me muddy the water a little more. 

"multicast rate limiting policies.  Although it works fine, it doesn't
(or didn't) fall under the umbrella of officially tested
configurations."

Or normal refer to Comix Multicast Suppression (CMS), CMS is based on
internal policy commands of the switch and the multicast MAC addresses
used. The policy commands allows the switch to rate limit the traffic on
ingress ports, only the DFE-Gold and DFE-Platinum switches can support
this function.

Due to the importance of the multicast protocol within the network,
blanket multicast rate suppression is neither recommended nor practical.
However, the Comix Multicast protocol used primarily between the I/A
workstation and Control Processors can be rate limited without a direct
impact on the MESH Network, but this rate limiting must not impede the
performance of I/A communications between the end devices, because of
this concern, the minimum setting is 1Mbps. Since the CMS is based on
internal policy commands of the switch and the multicast MAC addresses
used, only the DFE-Gold and DEF-Platinum switches can support this
function. 

Monitoring of this function when traffic exceeds the rate limit can only
be performed on the DFE-Platinum series switches via the syslog or trap
servers.

This function has been officially tested however when the deployment of
LDP occurred the configurator software tool had limitation on it ability
to deploy both CMS and LDP this has since been corrected and will be
available on the next release rev 3.1.2
 
Thank You
Mike Davis

-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx]
On Behalf Of Hicks, Gaylon F
Sent: Monday, February 09, 2009 1:02 AM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] network storm

Let me muddy the water a little (more).  VLANs are supported by Foxboro,
and are part of the MESH configurator tool, and a separate network using
separate switch hardware for the ZCP fieldbus is an officially supported
architecture.  

What is not an explicitly approved architecture is using VLANs to
segment the ZCP field bus(es) from the control network, although
functionally it is the same as the separate switch architecture.  And by
"explicitely approved" I mean it isn't a documented and tested
configuration by Foxboro, although it is pretty obvious that it will,
and does, work fine.  The problem with the separate switches on the ZCP
fieldbus is that you can't monitor those switches and ports in SMDH,
where the VLAN solution does let you monitor those ports. 

The same goes for the multicast rate limiting policies.  Although it
works fine, it doesn't (or didn't) fall under the umbrella of officially
tested configurations.

Russ? - Would you or any of the other Foxboro folks care to weigh in on
this?  If I have mis-stated any of this, please do.

For more light reading on the subject, you can take a look at these
documents - 

B0700AX-H - The MESH Control Network System Planning and Sizing 
B0700AZ-K - The MESH Control Network Architecture Guide
B0700CA-H - The MESH Control Network Operation, and Switch Installation
and Configuration Guide

Thanks,
Gaylon Hicks
TVA - Browns Ferry


-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx]
On Behalf Of Jeremy Milum
Sent: Saturday, February 07, 2009 4:03 PM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] network storm

On Sat, Feb 7, 2009 at 12:01 PM, Boulay, Russ
<russ.boulay@xxxxxxxxxxxxxxxx> wrote:
> ** I'll have to give kudo's to Gaylon, as we reviewed his Mesh Network
a few weeks back.
> It was the cleanest running Mesh system that I have reviewed in the
last few years.
> Vlans for fieldbus, some broadcast limiting, Mesh was running at peak
performance.

many of the suggestions that Gaylan mentions are not supported by
foxboro, yet he has the best
network? that's a bit troubling.

do you perhaps have some recommendations you could give us for setting
up our mesh networks?
 
 
 
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