[31449] in resnet
Re: Controling broadcast/multicast storms
daemon@ATHENA.MIT.EDU (Doughty, Marc)
Wed Feb 10 14:34:17 2016
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Date: Wed, 10 Feb 2016 14:33:38 -0500
Reply-To: Resnet Forum <RESNET-L@listserv.nd.edu>
From: "Doughty, Marc" <marc_doughty@brown.edu>
To: RESNET-L@listserv.nd.edu
In-Reply-To: <DFF9F14AF14E6641A829301CD3D2EF3C8D5111E5@CSGMBX200W.pu.win.princeton.edu>
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Wow. It's been a while since I've seen that happen. If it was truly a
'storm' then you might not have Spanning Tree enabled, which prevents loops
from forming. While Spanning Tree used to get a bad rap back in the day,
it's really important to have it on. I'd rather have a limited outage
caused by Spanning Tree clamping-down on a loop than have a broadcast storm.
- Marc Doughty
"If you aren't sure who is the give-way vessel, you are the give-way
vessel."
On Tue, Feb 9, 2016 at 9:29 PM, Joseph M. Karam <jkaram@princeton.edu>
wrote:
> Hi All,
>
>
>
> In the past year we have been hit with a multicast storm and a broadcast
> storm that took out large portions of our network. We are looking at
> options to limiting the damage of one of these storms caused by a
> misbehaving client.
>
>
>
> 1. Has anyone implemented storm controls on their building switch
> ports and/or their core ports?
>
> 2. Are there any issues to be aware of with devices having problems
> with these controls in place?
>
> 3. Are there best practices on what thresholds to put in place
> (either based on percentage of bandwidth or packets/second)?
>
>
>
> Any recommendations would be appreciated. Thank you,
>
>
>
> Joe Karam
>
>
> ___________________________________________________ You are subscribed to
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<div dir=3D"ltr">Wow. It's been a while since I've seen that happen=
. If it was truly a 'storm' then you might not have Spanning Tree e=
nabled, which prevents loops from forming. While Spanning Tree used to get =
a bad rap back in the day, it's really important to have it on. I'd=
rather have a limited outage caused by Spanning Tree clamping-down on a lo=
op than have a broadcast storm.</div><div class=3D"gmail_extra"><br clear=
=3D"all"><div><div class=3D"gmail_signature"><br>- Marc Doughty<br>"If=
you aren't sure who is the give-way vessel, you are the give-way vesse=
l."</div></div>
<br><div class=3D"gmail_quote">On Tue, Feb 9, 2016 at 9:29 PM, Joseph M. Ka=
ram <span dir=3D"ltr"><<a href=3D"mailto:jkaram@princeton.edu" target=3D=
"_blank">jkaram@princeton.edu</a>></span> wrote:<br><blockquote class=3D=
"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding=
-left:1ex">
<div lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72">
<div>
<p class=3D"MsoNormal">Hi All,<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">In the past year we have been hit with a multicast s=
torm and a broadcast storm that took out large portions of our network.=C2=
=A0 =C2=A0We are looking at options to limiting the damage of one of these =
storms caused by a misbehaving client.<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p><u></u><span>1.<span style=3D"font:7.0pt "Times New Roman"">=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span><u></u>Has anyone implemented storm controls on their buildin=
g switch ports and/or their core ports?<u></u><u></u></p>
<p><u></u><span>2.<span style=3D"font:7.0pt "Times New Roman"">=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span><u></u>Are there any issues to be aware of with devices havin=
g problems with these controls in place?<u></u><u></u></p>
<p><u></u><span>3.<span style=3D"font:7.0pt "Times New Roman"">=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span><u></u>Are there best practices on what thresholds to put in =
place (either based on percentage of bandwidth or packets/second)?<u></u><u=
></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Any recommendations would be appreciated.=C2=A0 Than=
k you,<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Joe Karam<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
</div>
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</p></blockquote></div><br></div>
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<p>
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