The 3550 switch also supports an ACL that you can associate with a Layer 2 interface on your switch. These ACLs, referred to as port ACLs, are only supported on a physical interface and not on EtherChannel interfaces. You can apply port ACLs only on an interface in the inbound direction. You can define the following types of ACLs on a Layer 2 interface:
Standard IP ACLs
Extended IP ACLs
MAC extended ACLs
If you apply a port ACL to a trunk port, the ACL filters traffic on every VLAN that is present on that trunk port. If you apply a port ACL to a port with voice VLAN, the ACL filters traffic on both data and voice VLANs.
When you configure a port ACL, you can filter IP traffic by using IP ACLs and non-IP traffic on the same Layer ...