Note: The following configuration is for IPX only. It is a good idea to consider adding TCP/IP to the routers as well as IPX. Even though your network demands are strictly IPX, having TCP/IP on the routers will allow easier management and configuration through a remote telnet session.

Get An IPX Configuration With TCP/IP Added For Easier Management
Faxback Doc #0514

This sample configuration dynamically routes only IPX between two Cisco IOS routers using snapshot IPX RIP/SAP, and PPP with CHAP authentication over an ISDN link. With snapshot IPX RIP/SAP, routing updates are exchanged between routers during a brief user defined interval rather than the constant periodic exchange required of normal RIP/SAP. Aside from this snapshot interval, the ISDN line activates only when traffic demands. This is known as dial-on-demand routing (DDR). In contrast, the periodic exchange of normal RIP would force the ISDN line to be permanently active, potentially resulting in high ISDN costs.

An alternative to DDR using a snapshot routing protocol is DDR using static routes. Routing tables are statically created by the network administrator eliminating the need for snapshot routing exchanges. For smaller networks, static routes may suffice. However, for larger networks, manually maintaining static routing tables on every router can be an administrative chore. Fortunately, the duration and frequency of the snapshot routing interval can be configured such that any ISDN costs due to dynamic routing are relatively negligible compared with the benefits of simplified network administration.

Get A DDR Configuration Using Static Routes if static routing is still desired.
Faxback Doc #0517

Get A DDR Configuration Using Static Routes With TCP/IP Added For Easier Management
Faxback Doc #0514

Info On PPP Faxback Doc #ppp

Info On Snapshot Routing Faxback Doc #snapshot

Before You Begin

Get The IOS ISDN Command Glossary. Faxback Doc #0551 Detailed descriptions of all IOS commands used in ISDN configurations. Also provides links to the IOS Command Reference if more information is required

Get The IOS Command Line Interface Tutorial Faxback Doc #ios_tutorial Instructions on configuring an IOS router using the command line interface

Note: Commands followed by a <*> are on by default and do not have to be configured. The "!" marks that appear in the configuration are automatically entered by the router and function as line separators for easier reading.

Atlanta Router Configuration
In IOS "show running-config" format

version 11.2 <*>
service udp-small-servers <*>
service tcp-small-servers <*>
!
hostname Atlanta
!
enable secret cisco
!
username Boston password gocisco1
no ip domain-lookup
ipx routing 0000.0caa.1111
isdn switch-type basic-ni1
!
interface Ethernet0
no ip address <*>
 ipx network 100 encapsulation SAP
 ipx network 101 encapsulation NOVELL-ETHER secondary
!
interface BRI0
no ip address <*>
 encapsulation ppp
 dialer rotary-group 0
 isdn spid1 014045551111000 5551111
 isdn spid2 014045552222000 5552222
 no fair-queue <*>
 no cdp enable <*>
!
interface Dialer0
no ip address <*>
 encapsulation ppp
 ipx network AAAA
 no ipx route-cache
 ipx watchdog-spoof
 dialer in-band
 dialer idle-timeout 300
 dialer map snapshot 1 name Boston speed 56
 dialer map ipx AAAA.0000.0cbb.2222 name Boston speed 56 broadcast 16175553333
 dialer map ipx AAAA.0000.0cbb.2222 name Boston speed 56 broadcast 16175554444
 dialer hold-queue 10
 dialer load-threshold 200 either
 dialer-group 1
 snapshot server 15
 no fair-queue <*>
 no cdp enable <*>
 ppp authentication chap
 ppp multilink
!
dialer-list 1 protocol ipx permit
!
line con 0
 password console
 login
line aux 0 <*>
line vty 0 4 <*>
 login <*>
!
end <*>

Boston Router Configuration
In IOS "show running-config" format

version 11.2 <*>
service udp-small-servers <*>
service tcp-small-servers <*>
!
hostname Boston
!
enable secret cisco
!
username Atlanta password gocisco1
no ip domain-lookup
ipx routing 0000.0cbb.2222
isdn switch-type basic-5ess
!
interface Ethernet0
no ip address <*>
 ipx network 200
!
interface BRI0
no ip address <*>
 encapsulation ppp
 dialer rotary-group 0
 isdn spid1 0155533330 5553333
 isdn spid2 0155533330 5554444
 no fair-queue <*>
 no cdp enable <*>
!
interface Dialer0
no ip address <*>
 encapsulation ppp
 ipx network AAAA
 no ipx route-cache
 ipx watchdog-spoof
 dialer in-band
 dialer idle-timeout 300
 dialer map snapshot 1 name Atlanta speed 56 14045551111
 dialer map ipx AAAA.0000.0caa.1111 name Atlanta speed 56 broadcast 14045551111
 dialer map ipx AAAA.0000.0caa.1111 name Atlanta speed 56 broadcast 14045552222
 dialer hold-queue 10
 dialer load-threshold 200 either
 dialer-group 1
 snapshot client 15 600 suppress-statechange-update dialer
 no fair-queue <*>
 no cdp enable <*>
 ppp authentication chap
 ppp multilink
!
dialer-list 1 protocol ipx permit
!
line con 0
 password console
 login
line aux 0 <*>
line vty 0 4 <*>
 login <*>
!
end <*>

After You've Tried

You've tried the configuration and it doesn't work. Help is available!

Get IOS Router ISDN Troubleshooting Assistance Faxback Doc #isdn_ts

All contents copyright © Cisco Systems, Inc. Important notices.