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114062 Rev. A 3-1
Chapter 3
Implementation Notes
for All Dial Services
This chapter provides information about Bay Networks implementations for all
three dial services.
Point-to-Point Protocol
Site Manager automatically configures the Point-to-Point Protocol (PPP) on lines
in a demand pool and bandwidth pool, including ISDN B channels. For lines in a
backup pool, PPP is not automatically configured; you select it. PPP routes or
bridges datagrams over point-to-point lines and runs all routing/bridging protocols
that it supports. Synchronous and asynchronous interfaces use PPP.
Dial circuits use a PPP identification mechanism to identify the calling router to
the called router. The identification method relies on one of two PPP
authentication protocols -- Challenge Handshake Authentication Protocol
(CHAP) or Password Authentication Protocol (PAP). These authentication
protocols implement a security feature that identifies peer routers to one another.
The identification process takes place during PPP link negotiation, which occurs
before the routers establish a connection to send data. It enables the destination
router to identify the caller dynamically, allowing a single dial interface (ISDN or
modem) at a remote router to serve as the connection point to multiple routers. For
a router to identify callers, you must fill in the router’s caller resolution table.
When you configure dial services, Site Manager automatically creates a PPP line
record that all pools use. This is a generic record that a circuit uses for
identification.
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