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## RADIUS-Based Mirroring Sequence of Events

Figure 20 shows the sequence of events that take place during RADIUS-based mirroring. The tables after the figure describe the events indicated by the numbers and letters in the figure. Table 53 describes the configuration process; Table 54 describes the flow of traffic during a mirroring operation that is initiated when the user logs in; and Table 55 describes the flow of traffic when mirroring a user who is already logged in.

Figure 20: RADIUS-Based Packet Mirroring

To create a RADIUS-based packet-mirroring environment, you must complete the processes listed in Table 53.

Table 53: Setting Up the RADIUS-Based Packet-Mirroring Environment

Process | Description
--- | ---
A | The authorized individual requests packet mirroring of the user’s traffic and configures the analyzer device to receive mirrored traffic.
B | The ISP administration configures VSAs in the user’s RADIUS record.
C | The E Series router administrator configures RADIUS server information and the analyzer interface connection to the analyzer device.

Table 54 indicates the sequence of steps for a packet mirroring operation that takes place when a user starts a new session.

Table 54: RADIUS-Based Mirroring During Session Start (User-Initiated)

Step | Description
--- | ---
1 | A user logs in to an E Series router, requesting authentication by the RADIUS server. Attributres in the logon request are examined to determine whether any match a configured trigger. The first match starts the packet mirroring session for the user.
2 | The RADIUS server authenticates the user and sends packet mirroring VSAs and any other configured VSAs to the router. The router creates a secure policy based on the VSAs and starts mirroring the user’s traffic.
3 | The router sends the user’s original traffic to its intended destination.
4 | The router sends the mirrored traffic to analyzer device.
5 | The analyzer device provides information for the requesting individual.

Table 55 indicates the sequence of steps for a packet mirroring operation that is configured for a currently running session.

Table 55: RADIUS-Based Mirroring of Currently Running Session (RADIUS-Initiated)

Step | Description
--- | ---
1 | A user logs in to the E Series router; no mirroring action is configured.
2 | Packet mirroring is enabled on the RADIUS server. Authenticated users are examined to determine whether any match a configured trigger. The first match determines the router to which to send change-of-authorization messages. The RADIUS server sends change-of-authorization messages containing packet mirroring VSAs to the router. The router creates a secure policy based on the VSAs and starts mirroring the user’s traffic.
3 | The router sends the user’s original traffic to its intended destination.
4 | The router sends mirrored traffic to the analyzer device.
5 | The analyzer device provides information for the requesting individual.

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