Description: The value of this object determines whether the switch is to operate as a single bridge or as a bridge per VLAN (the default). In multiple bridge mode the switch maintains a separate filtering database for each VLAN, whereas in single bridge mode it uses a single database for them all. Thus in multiple bridge mode the MAC address of a station can be learnt on more than one port provided they are in separate VLANs, while in single bridge mode the switch makes just one entry for each address. Multiple bridge mode is useful in that separate VLANs may be joined by a bridge external to the switch, whereas in single bridge mode VLANs may only be connected by routers. Not all switches will support both modes, and any attempt to set the mode to an unsupported value will be rejected.