Cisco Cisco IOS Software Release 12.4(15)T

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Transparent Bridging Support for Authentication Proxy
  Configuration Examples for Transparent Authentication Proxy
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Cisco IOS Security Configuration Guide
bridge 1 protocol ieee
!
Router# show ip auth-proxy cache
Authentication Proxy Cache
Client Name AuthRule, Client IP 10.0.0.1, Port 1145, 
timeout 60, Time Remaining 60, state ESTAB
Authentication Proxy in Integrated Route Bridge Mode: Example
In an integrated routing and bridging environment, a bridged network is interconnected with a router 
network. Both routing and bridging can occur in the same router with connectivity between routed and 
bridged domains. 
The following example (see 
) shows how to configure authentication proxy in an integrated 
routing and bridging environment in which network users (that is, hosts on the bridged interface 
FastEthernet 5/0) are challenged for user credentials before being given access to protected resources. 
Figure 3
Authentication Proxy in Integrated Route Bridge Mode: Sample Topology
!
aaa new-model
!
aaa authentication login default group radius
aaa authorization auth-proxy default group radius 
aaa accounting auth-proxy default start-stop group radius
!
ip cef
!
ip auth-proxy name AuthRule http inactivity-time 60
!
bridge irb
!
interface FastEthernet3/0
no ip address
duplex half
bridge-group 1
!