BRI Configuration Example

ISDN

interface BRIO lp address 10.1.20 0,1 2 5 5.2 55.255,252 oneapeulation ppp ppp authentication chap imIii spidl 510S552GG10ÛÛ1. &552001 isdn spid? 51055520020001 5552002 diatl-ar qroup 1

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The interface bri interface-number command designates the interface that is used for ISDN on a router acting as a TE1 device.

A router without a native BRI interface is a TE2 device. It must connect to an external ISDN TA via a serial interface. On a TE2 router, the interface serial interface-number command must be used.

The default encapsulation on a BRI interface is HDLC. The encapsulation ppp command changes the encapsulation on the ISDN interface. Although HDLC encapsulation offers a simpler configuration, it lacks much of the functionality provided by PPP. Some of the functionality that is lacking includes link control protocol (LCP) options such as Password Authentication Protocol (PAP) and Challenge Handshake Authentication Protocol (CHAP) authentication, as well as multilink capability. Authentication is typically a requirement in networks of today, particularly if calls are to be received from multiple dialup sources. Otherwise, calling line identification (CLID) can be used with HDLC encapsulation to identify callers, providing that the service provider sends this information.

To revert from PPP encapsulation to the default, use the encapsulation hdlc command. Other encapsulation options for BRI interfaces may include Link Access Procedure, Balanced (LAPB) and Frame Relay.

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