594 Chapter 8: WAN Protocols and Design
Foundation Summary
The Foundation Summary is a collection of tables and figures that provide a convenient review
of many of the key concepts in this chapter. For those of you already comfortable with the topics
in this chapter, this summary could help you recall a few details. For those of you who just read
this chapter, this review should help solidify some key facts. For any of you doing your final
prep before the exam, these tables and figures will hopefully be a convenient way to review the
day before the exam.
Table 8-35 summarizes the configuration commands used for HDLC and PPP configuration:
Table 8-36 summarizes the more popular commands used for Frame Relay configuration.
Table 8-35
PPP and HDLC Configuration Commands
Command
Configuration Mode
encapsulation {hdlc | ppp | lapb}
Interface subcommand
compress [predictor | stac | mppc [ignore-pfc]] Interface
subcommand
Table 8-36
Frame Relay Configuration Commands
Command
Configuration
Mode
Purpose
encapsulation frame-
relay [ietf | cisco]
Interface
Defines Frame Relay encapsulation; is used
rather than HDLC, PPP, and so on.
frame-relay lmi-type
{ansi | q933a | cisco}
Interface
Defines the type of LMI messages sent to the
switch.
bandwidth num
Interface
Sets the route's perceived speed of the interface.
Bandwidth is used by some routing protocols to
influence the metric.
frame-relay map protocol
protocol-address dlci
[payload-compress
{packet-by-packet | frf9
stac}] [broadcast] [ietf |
cisco]
Interface
Statically defines a mapping between a network
layer address and a DLCI.
keepalive sec
Interface
Defines whether and how often LMI status
enquiry messages are sent and expected.
interface serial num.sub
[point-to-point |
multipoint]
Global
Creates a subinterface, or references a
previously created subinterface.
ch08.fm Page 594 Monday, March 20, 2000 5:17 PM