Network Layer Protocol Phase

The Network Control Protocols (NCP) are used to configure the appropriate network layer. Solstice PPP implements the Internet Protocol Control Protocol (IPCP) to configure IP over PPP.

Once the network layer is configured by an exchange of NCP frames, IP datagrams can be encapsulated for transmission across the link. LCP frames may be exchanged periodically to test and maintain the link.

During the network layer protocol phase, LCP, NPC, and IP frames should be transmitted in the PPP frames. All other frames are discarded.