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5. Upon receiving the PADO packets with the Circuit-ID tag, the switch will remove the tag

and send the packets to the client. The switch will forward the PADO packets without the

Circuit-ID tag directly.

6. The client sends PADR (PPPoE Active Discovery Request) packets according to the

process.

7. The switch intercepts PADR packets and inserts a unique Circuit-ID tag to them.

8. The switch forwards the PADR packets with Circuit-ID tag to the BRAS.

9. The BRAS processes the received Circuit-ID tag in the PADR packets and extracts the

Circuit-ID field to the RADIUS for accounting. And the BRAS allocates a PPP process

session ID for this PPP session.

10. The BRAS responses with the PADS (PPPoE Active Discovery Session-confirmation)

packets after receiving the PADR packets.

11. Upon receiving the PADS packets with the Circuit-ID tag, the switch will remove the tag

and send the packets to the client. The switch will forward the PADS packets without the

Circuit-ID tag directly.

On the PPPoE Circuit-ID page, you can enable the PPPoE Circuit-ID function globally. Each

port’s PPPoE Circuit-ID Insertion feature and type can be configured separately.

Choose the menu Network Security→PPPoE Config→PPPoE Circuit-ID to load the following

page.

Figure 13-26 PPPoE Circuit-ID Config