This read-create value is the 802 MAC source address that incoming frames' source address is compared against, subject to wildcarding defined by a separate mask object, with matching frames potentially subject to this filter entry's associated action. An admin sets this to the specific source MAC address, or a masked range, that should trigger this filter's associated processing action. For example, setting this object to a known rogue device's MAC address configures the filter to match and act on any traffic originating from that address.