OK, this is a tough one but it is a common issue it seems...
1. Remember the switch is a smarter bridge.
2. Remember ARP?
3. If a device does not know what to do with a packet it will arp?
4. Check those packets and see if they are not a lot of ARPs.
5. As for the multicast packets, do you...
If you come up short and it looks like you will be short, you will see one or more of your blades power down due to lack of power.
Cisco has a power calculator for determining your exact power consumption and needs.
Have you enabled portfast on the ports with PC's / Servers?
Sometimes when PC's / MACs etc cannot get to network resources, portfast is a lifesaver.
Note: Careful here as you typically want only single access devices attaching to that port (i.e. one nic and not a hub).
You can read the...
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