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LCP, Authentication, and NCP Stage

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Within some of the PPP phases described previously, PPP also goes into specific stages such as LCP negotiation, authentication, and NCP negotiation. For more information, refer to RFC 1548 and RFC 1661. LCP (Mandatory Phase) LCP is a phase in which parameters to establish, configure, and test the data-link connection are negotiated. An LCP state of open means that LCP was successfully completed, while an LCP state of closed indicates an LCP failure. This diagram shows a conceptual view of an LCP handshake: The LCP negotiation also uses a parameter called MagicNumber, which is used to determine if the link is looped back. A random string is sent across the link and, if the same value is returned, then the router determines that the link is looped back. Authentication (Optional Phase by Default) In this stage, the authentication is performed with the authentication protocol (CHAP or PAP) agreed upon in LCP negotiation. For PAP related information, refer to Configuring and Troubleshooting…

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