Avaya a500 Guida Utente
Cajun A500 ATM Switch Overview
1-14
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
TM
, IPX, and DECnet
TM
. 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).