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Enterasys Xpedition User Reference Manual 365

Configuring PPP Interfaces

Use of LCP Magic Numbers

LCP magic numbers enable you to detect situations where PPP LCP packets are looped

back from the remote system, resulting in an error message. The use of LCP magic

numbers is enabled on the XP by default; however, should you employ a service profile in

which the use of LCP magic numbers has been disabled, undetected “loopback” behavior

may become a problem.

Note: In the event that a PPP WAN interface remains unrecognized at startup due to

loopback interference, you can use the ppp restart command in the CLI to remedy

the situation.

Configuring PPP Interfaces

This section provides an overview of configuring a host of WAN parameters and setting

up WAN interfaces. When working in the PPP environment, you must first define the

type and location of your WAN interfaces. Having established the type and location of

your WAN interfaces, you need to (optionally) define one or more service profiles for your

WAN interfaces, then apply a service profile to the desired interface(s). Examples of this

process are displayed in PPP Port Configuration on page 368.

Defining the Type and Location of a PPP Interface

To configure a PPP WAN port, you need to first define the type and location of one or

more PPP WAN ports on your XP. The following command line displays a simplified

example of a PPP WAN port definition:

If the port is an HSSI port that will be connected to a HSSI port on another router, you can

specify clock <clock-source> in the definition. (This feature is supported on HSSI boards,

part number XP-HSSI-02-AA.)

Setting up a PPP Service Profile

Once you have defined the type and location of your PPP WAN interface(s), you can

configure your XP to more efficiently utilize available bandwidth for PPP

communications.

Note: The XP comes with a set of “default values” for PPP interface configuration

settings, which means that setting up a PPP service profile is not absolutely

necessary to begin sending and receiving PPP traffic on your XP.

Define the type and location of

a PPP WAN port.

port set <port> wan-encapsulation ppp speed <number>

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Cabletron Systems SSIM-R8-02 Spécifications Page 385