bridge irb
 !
 !-------启用集成路由桥接模式
 !
 interface Ethernet0
 ip address 192.168.0.254 255.255.255.0
 ip nat inside
 
 !-------配置内网接口
 
 !
 interface ATM0
 no ip address
 no atm ilmi-keepalive
 pvc 0/35
 encapsulation aal5snap
 !
 bundle-enable
 dsl operating-mode auto
 bridge-group 1
 !
 !--------配置ATM接口，把ATM0接口归属于bridge-group 1
 !
 interface BVI1
 ip address 171.68.1.1 255.255.255.240
 ip nat outside
 
 !---------配置虚拟桥接组1做为NAT的外部接口
 !
 ip nat inside source list 1 interface BVI1 overload
 
 
 ip nat inside source static tcp 192.168.0.5 80 171.68.1.1 80 extendable
 
 
 ip classless
 ip route 0.0.0.0 0.0.0.0 171.68.1.254
 
  access-list 1 permit 192.168.0.0 0.0.0.255
 
  bridge 1 protocol ieee 
  bridge 1 route ip

 !!---------配置桥接协议和IP协议