Although it is not mandatory, it is really a must for dial-up lines. LCP, the Link Control Protocol, is used on top of HDLC to negotiate options pertaining to the data link, such as the Maximum Receive Unit (MRU) that states the maximum datagram size one side of the link agrees to receive.Īn important step at the configuration stage of a PPP link is client authorization. PPP achieves this by adding a protocol field to the basic HDLC frame that identifies the type of packet is carried by the frame.
As opposed to the more primitive SLIP encapsulation, a PPP frame is capable of holding packets from other protocols than IP, such as Novell's IPX, or Appletalk. This discussion is far from complete if you want to know more about PPP, you are urged to read its specification in RFC-1548, as well as the dozen or so companion RFCs.Īt the very bottom of PPP is the High-Level Data Link Control Protocol, abbreviated HDLC, which defines the boundaries around the individual PPP frames, and provides a 16-bit checksum.
Below, we will briefly cover these basic building blocks of PPP. For each of these capabilities, PPP has a separate protocol. It lets the communicating sides negotiate options such as the IP address and the maximum datagram size at startup time, and provides for client authorization.
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PPP is a protocol to send datagrams across a serial connection which grew out of the older SLIP (Serial Line Interface Protocol) protocol. Cisco Default Administratitve Distances.
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