Link Configuration Frames

Link configuration frames are transmitted during the link establishment phase. The data field of a link configuration frame carries information used to negotiate the configuration options for the link. The Link configuration frames are:

• Configure-request

  Code 0x01. Request the establishment of a link with a particular configuration. Represents the start of the link establishment phase. Terminate-request frames are transmitted periodically until either a valid response is received, or the number of frames sent exceeds the value of the lcp_max_restart parameter in the file ppp.conf.

• Configure-ack

  C ode 0x02. Acknowledge the receipt of a recognizable Configure-request frame, and accept the requested configuration. Represents the end of the link establishment phase.

• Configure-nak

  Code 0x03. Acknowledge the receipt of a recognizable Configure-request frame, but reject some or all of the requested configuration.

• Configure-reject

  Code 0x03. Reject a Configure-request frame because it is not recognizable or because the requested configuration is not acceptable.