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11-2 Internetwork Design Guide

Introduction

The topology shown in Figure 11-1 includes all of the Cisco routers that can be conﬁgured for ISDN.

In Figure 11-1, Router A and Router C are located in central ofﬁces and are equipped with multiple

ISDN interfaces for use by the remote sites (Router B and Router D) that dial in.

Figure 11-1 ISDN Network Topology

Remote Site Options

The remote site can be a Cisco 750, a LAN2LAN for ISDN card, an AccessPro PC card, a Cisco

1003/4, a Cisco 2503/4, or a Cisco 2516/7.

The Cisco 750 series (formerly Combinet) provides ISDN connectivity for telecommuters and

professionals who work at home that need IP and IPX routing or bridging functionality over ISDN.

The Cisco 751 supports up to four devices on the directly attached LAN. The Cisco 752 also supports

four devices and includes a built-in NT1. The Cisco 753 supports four devices, includes a built-in

NT1, and includes an analog interface that allows a standard analog telephone, fax machine, or

modem to share the ISDN BRI line with data trafﬁc, reducing the overall cost of the telecommuting

solution. Unlike the other products described in this chapter, the Cisco 750 series routers do not run

the Cisco Internetwork Operating System (Cisco IOS) software, so the commands and conﬁguration

examples in this chapter do not apply to the Cisco 750 series.

The LAN2LAN for ISDN card is suitable for telecommuters and professionals who work at home

that already have a PC. The card can be installed in the ISA or EISA slot of a PC chassis and is

available in single BRI (requires one slot) and four-port BRI (requires two slots) conﬁgurations. The

card comes with an Open Data-link Interface (ODI) workstation driver. LAN2LAN for ISDN

supports IP and IPX routing and bridging over ISDN connections, with special software features to

allow automatic dial-on-demand routing (DDR), bandwidth on demand, maintenance of virtual

host-client connections, and data compression. The LAN2LAN card is conﬁgured through a menu

interface, so the commands and conﬁgurations examples in this chapter do not apply to this card.

The AccessPro PC card is suitable for small remote ofﬁces that already have a PC. The card can be

installed in the ISA or EISA slot of a PC chassis and provides one ISDN BRI, two synchronous serial

ports, and either one Ethernet interface or one Token Ring interface. The AccessPro runs the Cisco

IOS software and does not rely on the PC for route processing—all routing functionality resides on

the card itself, so the AccessPro card does not affect the performance of other applications that may

Router C Router D

Router A Router B

Cisco 4000 series

with MBRI NPM

Cisco 7000 series

with MIP controller or

Cisco 4000 series

with PRI NPM

Cisco 750 series

Cisco 1003/4

Cisco 2503/4

Cisco 2516/7

LAN2LAN for ISDN card

AccessPro PC card

Central sites

Remote sites

S4438

Leased line

ISDN

1 2 3 4 5 6 7 ... 33 34

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