Avaya a500 사용자 가이드

Cajun A500 ATM Switch Overview

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Cajun A500 ATM Switch User Guide

Point to Point Protocol (PPP)

The Cajun A500 ATM Switch provides Point to Point Protocol (PPP) functionality. PPP

provides a standard method for transporting packets of any protocol over a

point-to-point link. It encapsulates network packets into a format suitable for a serial

link. PPP can carry many different types of networking protocols, including TCP/IP,

UDP/IP, AppleTalk

, IPX, and DECnet

. The Cajun A500 functionality enables you to

call into the A500 and access Telnet, TFTP, and the SNMP functionality. In addition, the

Cajun A500 can dial out when triggered by a Trap/Notify event.

PPP has three main components:

U A method for encapsulating datagrams over serial links.

U A Link Control Protocol (LCP) for establishing, configuring, and testing the

data-link connection.

U A family of Network Control Protocols (NCPs) for establishing and configuring

different network-layer protocols.

In order to establish communications over a point-to-point link, each end of the PPP link

must first send LCP packets to configure the data link during Link Establishment phase.

After the link has been established, PPP provides for an optional Authentication phase

before proceeding to the Network-Layer Protocol phase.

Figure 1-7 displays the software architecture for the Cajun A500 with PPP. This

architecture enables applications (Telnet, TFTP, SNMP, Trap) to run over PPP as if it was

any other network interface (i.e. ethernet).