see ciscopress bcmsn (ccnp) page 544 pdf version.
All hosts on VLAN 1 (PC-1, PC-2, and PC-3) will experience the broadcast storm. All trunk
links between switches will transport the broadcast frames. In addition, all switch supervisor
CPUs will receive and process the broadcasts because each switch has an IP address for
management assigned to VLAN 1. (For this reason, it is recommended to reserve VLAN 1 for
control protocol traffic only. User-generated broadcasts can overload the switch supervisor to
the extent that it no longer can keep track of its control or “overhead” protocols, such as VTP,
CDP, and so forth. Instead, all user traffic should be kept off VLAN 1.)
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