Giuseppe Larosa Tue, 05/06/2008 - 08:23
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Hello,


give a look at the following link


http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.1E/native/configuration/guide/storm.html


I try to guess: we can have unicast storm when the switch is forwading frames with an unknown unicast MAC address destination. These frames are processed like broadcast / multicast and are sent to all ports in the VLAN with the exception of the source port.


So you can protect your ports from this case of traffic unicast with a destination that have never spoken.


Hope to help

Giuseppe



Giuseppe Larosa Tue, 05/06/2008 - 08:27
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Hello,

sorry my answer was only half.


Broadcast stom control instead controls the level of BW that can be used by frames with a broadcast destination.

A broadcast storm happens during a bridging loop and frames that are over the threshold are dropped anc counted as output drops in the output of show interface .

We use 1% level on gigabit and tengigabit interfaces on our network.

This can help during troubles caused by bridging loops.


hope to help

Giuseppe

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