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Cajun A500 ATM Switch Overview

Cajun A500 ATM Switch User Guide

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Initially, the PPP task configures the channel for dialin mode and starts the PPP network 

interface; this creates and starts the PPP daemon. The PPP daemon waits on 

initialization, send, receive, and control events. The serial port and modem are initialized 

through the PPP daemon. The PPP task has the following duties when set up: 

U Checks message queue for a trap message - If there is a trap message, it saves 

the information in a private log. If the trap is the first one in, the log starts a hold 

trap message timer.If the log is almost full (ten events) then change PPP network 

configuration to dialout and send trap. After last trap is sent out the PPP channel 

waits five seconds and then shuts down the dialout connection and returns to 

waiting for dialin connection.

U Checks to see if hold trap message timer has expired - If yes, then configure 

the channel for dial out and send the trap.After the last trap is sent out the PPP 

channel, wait five seconds and then shuts down the dialout connection and goes 

back to waiting for dialin connection.

U Checks the link status - If link was up and then goes down again, reset the 

modem and start waiting for dialin connect again.

The PPP task does not break down a dialin connection enricher to send out a trap 

in the above cases. Instead it waits for dialin link to be disconnected.

Authentication Configuration

PPP defines a Link Control Protocol, which enables negotiation of an Authentication 

Protocol for authenticating its peer before allowing Network Layer protocols to transmit 

over the link. Authentication configuration options are: 

U Password Authentication Protocol (PAP)

U Challenge Handshake Authentication Protocol (CHAP)

The IP Control Protocol (IPCP) is negotiated last. After this step completes, the entire link 

opens so that applications can begin passing data. These authentication protocols are 

intended for use primarily by hosts and routers that connect to a PPP network server via 

switched circuits or dialup lines, but might be applied to dedicated links as well. The 

server can use the identification of the connecting host or router in the selection of 

options for network layer negotiations.