
Configuring PPP Services
2-2
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PPP Overview
Point-to-Point Protocol (PPP) is a standard method of routing or bridging
datagrams between peer routers or other devices over serial point-to-point links
(Figure 2-1
).
Figure 2-1. Point-to-Point Network Connection
PPP serves three major functions:
• Data link layer connection and management
• Network layer connection and management
• Datagram encapsulation
PPP uses a suite of data link and network control protocols to connect peer
routers. PPP also allows peers to negotiate and determine data link and network
layer options, such as those listed in Table 2-1
and Table 2-2. When negotiations
complete successfully, PPP encapsulates the data and transmits it over the link.
LAN LAN
Router Router
Synchronous line
PPP0001A
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