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Reccomendations for Storm Control Settings

Last Modified: 2012-05-12
I recently finished resolving a broadcast storm in one of our remote sites with 3 Dell Powerconnect 35xx switches wired in series. I've turned on storm control to limit broadcast traffic to 3% on the trunk ports, but I'm wondering how best to tune this since the 35xx series switches don't have much processor capacity and can't provide real-time port statistics.

Here are the major details:
I can't change the physical plant.
There may or may not be daisy-chains of unmanaged switches on some ports
Each switch is trunked to the next in series over the Gigabit ports.
There are no redundant links.
The site fileserver and router are on an edge switch which is set as the spanning-tree root.
The ratio of WAN/LAN traffic is roughly 80/20. Most of this is Citrix sessions with a small amount of SMB for printing and a local database app.
MSTP Spanning tree is enabled on all managed switches.

Here are my goals:
Keep switch CPU load below 25%
Stop broadcast storms as close to the source as possible.
Minimize the impact of any tuning on normal traffic.
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