Can the router-on-a-stick approach to inter-VLAN routing also support inter-VLAN bridging?
Yes. Simply configure a bridge-group on multiple subinterfaces. Example A-6 bridges protocols other than IP, IPX, and AppleTalk between VLANs 1 and 2.
Example A-6 Router-on-a-Stick Configuration That Routes IP, IPX, and AppleTalk but Bridges Other Protocols
no ip address
encapsulation isl 1
ip address 10.1.1.1 255.255.255.0
encapsulation isl 2
ip address 10.1.2.1 255.255.255.0
ipx network 2
encapsulation isl 3
ip address 10.1.3.1 255.255.255.0
appletalk cable-range 300-310 304.101
appletalk zone ZonedOut
ipx network 3
bridge 1 protocol ieee