Cisco IOS: Bridge Group

interface GigabitEthernet1
 description ## ISP INTERFACE ##
 no ip address
 duplex auto
 speed auto
 bridge-group 1
!
!
interface Vlan3
 description "Bridged DMZ"
 no ip address
 ip virtual-reassembly in
 bridge-group 1
!
!
interface BVI1
 description ## ISP INTERFACE ##
 ip address [IP_ADDRESS]
 no ip redirects
 no ip unreachables
 no ip proxy-arp
 ip nat outside
 ip virtual-reassembly in
 service-policy output LLQ
!
!
bridge 1 protocol ieee
bridge 1 route ip
!