Compatible Systems 5.4 - Manual (Page 160)

154 Chapter 9 - Bridging
Exclude Non-Routed Protocols
This checkbox determines whether this interface will bridge protocols which
the router does not route. Examples are NetBEUI and DEC LAT.
• If checked, the interface will not bridge protocols that the router does not
route.
• If unchecked, protocols which the router does not route will be bridged
to all other interfaces which also have bridging turned on (and do not
have this checkbox checked).