听说过ＲＩＰ、ＩＧＲＰ、ＥＧＩＲＰ、ＯＳＰＦ、ＩＳ－ＩＳ、ＥＧＰ和ＢＧＰ，就是没听说过透明路由．
那么，透明路由到底是什么呢？
Router#config t
Router(config)#bridge ?
<1-255> Bridge Group number for Bridging.
crb Concurrent routing and bridging
irb Integrated routing and bridging
mac-address-table MAC-address table configuration commands
Router(config)#bridge crb
Router(config)#int s1/1
Router(config-if)#br
Router(config-if)#bridge-group 1 ?
circuit-group Associate serial interface with a circuit group
input-address-list Filter packets by source address
input-lat-service-deny Deny input LAT service advertisements matching a
group list
input-lat-service-permit Permit input LAT service advertisements matching a
group list
input-lsap-list Filter incoming IEEE 802.3 encapsulated packets
input-pattern-list Filter input with a pattern list
input-type-list Filter incoming Ethernet packets by type code
lat-compression Enable LAT compression over serial or ATM
interfaces
output-address-list Filter packets by destination address
output-lat-service-deny Deny output LAT service advertisements matching a
group list
output-lat-service-permit Permit output LAT service advertisements matching
a group list
output-lsap-list Filter outgoing IEEE 802.3 encapsulated packets
output-pattern-list Filter output with a pattern list
output-type-list Filter outgoing Ethernet packets by type code
path-cost Set interface path cost
priority Set interface priority
spanning-disabled Disable spanning tree on a bridge group
subscriber-loop-control Configure subscriber loop control
<cr>
Router(config-if)#bridge-group 1
Router(config)#access-list 1 permit host xxx.xxx.xxx.xxx
以上就是简单的透明路由配置，它不同于普通的路由协议，它采用桥接技术进行路由．
