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P-2000W_V2 User’s Guide
Appendix C
PPPoE
PPPoE in Action
An ADSL modem bridges a PPP session over Ethernet (PPP over Ethernet, RFC 2516) from your computer to an ATM PVC (Permanent Virtual Circuit) which connects to a DSL Access Concentrator where the PPP session terminates (see Figure 38 on page 120). One PVC can support any number of PPP sessions from your LAN. PPPoE provides access control and billing functionality in a manner similar to
Benefits of PPPoE
PPPoE offers the following benefits:
It provides you with a familiar
It lessens the burden on the carriers of provisioning virtual circuits all the way to the ISP on multiple switches for thousands of users. For GSTN (PSTN and ISDN), the switching fabric is already in place.
It allows the ISP to use the existing
Traditional Dial-up Scenario
The following diagram depicts a typical hardware configuration where the computers use traditional
| Appendix C PPPoE | 119 |
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