TP-Link T2500-28TCTL-SL5428E T2500-28TCUN V1 User Guide - Page 248
PPPoE Circuit-ID, Network Security, PPPoE Config
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The PPPoE discovery process is illustrated below: 1. The client sends PADI (PPPoE Active Discovery Initiation) packets to the switch. 2. The switch intercepts PADI packets and inserts a unique Circuit-ID tag to them. 3. The switch forwards the PADI packets with Circuit-ID tag to the BRAS. 4. The BRAS responses with the PADO (PPPoE Active Discovery Offer) packets after receiving the PADI packets. 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 238