# Configuring Router to Mirror Users Already Logged In

When a mirroring operation is initiated for a user who is already logged in (RADIUS-initiated mirroring), the RADIUS server uses change-of-authorization messages and passes the required RADIUS attributes and the identifier of the currently running session to the E Series router. The router uses this information to create the secure policy and attaches it to the interface that is created for the user. The E Series router must be configured to accept change-of-authorization messages from the RADIUS server.

1. Specify the RADIUS dynamic-request server that sends change-of-authorization messages to the router, and enter RADIUS configuration mode.
   host1(config)#radius dynamic-request server 192.168.11.0
2. Specify the UDP port used to communicate with the RADIUS server.
   host1(config-radius)#udp-port 3799
3. Create the key used to communicate with the RADIUS server.
   host1(config-radius)#key mysecret
4. Configure the router to receive change-of-authorization messages from the RADIUS server.
   host1(config-radius)#authorization change host1(config-radius)#exit host1(config)#exit
5. Verify your RADIUS-initiated mirroring configuration.

       host1#show radius dynamic-request servers

                      RADIUS Request Configuration
                      ----------------------------
                                              Change
                       Udp                      Of
        IP Address     Port   Disconnect   Authorization   Secret
       -------------   ----   ----------   -------------   ------
        10.10.3.4      3799   enabled      enabled         mysecret

6. Configure the analyzer interface to send the mirrored traffic to the analyzer device.
   host1(config)#interface fastEthernet 4/0 host1(config-if)#ip analyzer

   Alternatively, for increased security, create the analyzer interface at one end of an IPSec tunnel to the analyzer device.

   host1(config)# interface tunnel ipsec:mirror3 transport-virtual-router default host1(config-if)#ip analyzer host1(config-if)#exit host1(config)#ip route 192.168.99.2 255.255.255.255 tunnel ipsec:mirror3