
Configuring Line Services
10-2 115391-A Rev. A
PPP uses a suite of data link and network control protocols to connect peer
routers. It also allows peers to negotiate and determine data link and network layer
options, such as those listed in Tables 10-
1 and 10-2. When negotiations complete
successfully, PPP encapsulates the data and transmits it over the link.
Table 10-1. Sample Data Link Control Protocol Options
Option Function
Maximum Receive Unit Specifies the maximum transmission unit (MTU)
size for the line.
Authentication Protocol:
• Password Authentication
Protocol (PAP)
• Challenge Handshake
Authentication Protocol
(CHAP)
Imposes network security by requiring an
authentication process.
Link Quality Protocol Enables or disables link quality monitoring and
reporting.
Table 10-2. Network Control Protocol and Options
Protocol Negotiable Options
IP Control Protocol (IPCP) IP Addresses (for backward compatibility), IP
Address (default)
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