Nice post on CCIE TO BE about how to block traffic destined for unknown unicast/multicast addresses on a switchport. By default, if a switchport receives unknown unicast traffic it floods it out to all the ports. This behaviour can be stopped using the command "switchport block unicast".
Configuration guide link for this command:
http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/12.2_44_se/configuration/guide/swtrafc.html#wp1087814
Command reference link for this command:
http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/12.2_44_se/command/reference/cli3.html#wp1948063
Configuration guide link for this command:
http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/12.2_44_se/configuration/guide/swtrafc.html#wp1087814
Command reference link for this command:
http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/12.2_44_se/command/reference/cli3.html#wp1948063
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