2.1 PPP Overview
The PPP protocol consists of the Link Control Protocol (LCP), Network Control Protocol (NCP),
and PPP extension protocols. PPP establishes links through a series of negotiations.
A point-to-point (P2P) connection is a simple WAN connection. Link layer protocols of a PPP
link are as follows:
l Point-to-Point Protocol (PPP): supports synchronous and asynchronous transmission.
l High-level Data Link Control protocol (HDLC): supports only synchronous transmission.
Located at the data link layer of the Open Systems Interconnection (OSI), PPP supports
synchronous or asynchronous full-duplex links to transmit data from point to point. PPP is widely
used because:
l It provides user authentication.
l It supports synchronous and asynchronous communications.
l It can be easily expanded.
PPP defines a set of protocols, including:
l Link Control Protocol (LCP): is used to establish, monitor, and terminate data links.
l Network Control Protocol (NCP): is used to establish and configure different network-layer
protocols, and negotiate the format and type of packets transmitted over data links.
l Authentication protocols: include Password Authentication Protocol (PAP) and Challenge-
Handshake Authentication Protocol (CHAP), which are used for network security
authentication.
2.2 PPP Features Supported by the S9300
A PPP link is set up by using PAP or CHAP authentication.
PPP can be configured on POS interfaces of the S9300 to implement the following functions:
l PAP or CHAP authentication
l PPP negotiation timeout
l PPP polling interval
l Suppression of direct route learning
2.3 Setting PPP Parameters
This section describes how to configure PPP as the encapsulation protocol on an interface and
set PPP parameters, including negotiation timeout interval, polling interval, and suppression of
direct route learning.
2.3.1 Establishing the Configuration Task
Before configuring the PPP protocol on an interface, familiarize yourself with the applicable
environment, complete the pre-configuration tasks, and obtain the data required for the
configuration. This will help you complete the configuration task quickly and accurately.
Quidway S9300 Terabit Routing Switch
Configuration Guide - WAN Access 2 PPP Configuration
Issue 02 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
17
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