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PPP Concepts

308639-14.00 Rev 00

2-7

Figure 2-2 demonstrates how a PPP interface initializes.

Figure 2-2. Initializing the PPP Interface

Router A Router B

PPP0002A

1. PPP interface comes alive on network; begin LCP negotiations:

2. LCP opened; begin authentication phase, PAP or CHAP:

3. Authentication complete; begin NCP negotiations:

4. NCP open; begin transmitting data:

Send Configure-Request

Send Authenticate-Request

Send Authenticate-ACK

Send Configure-Request

Send Configure-ACK

Send Configure-Request

Send Configure-ACK

PAP* CHAP*

Challenge

Response

Response Match

*Shows Router A initating authentication. Router B can also initiate authentication.

Send Data

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Avaya Configuring PPP Services Manual do Utilizador Página 35