On that SF300 switch...make sure you load the 1.1.2.0 firmware image on it. Older versions (1.1.1.8 and below) have a MAC table bug. Entries no longer expire and new entries don't come in, and the stuck entries are ignored. This causes port flooding; the switch would behave like a hub, sending multicast traffic to all ports with all traffic. When I called Cisco support they told me that it appears after 49.8 days of uptime. Reboot and it behaves for 49 more days. Cisco initially sent me beta firmware with the fix, but they have since fixed this in 1.1.2.0. Good luck on your install, let us all know how it goes!
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