! Listing 7.19: Spoke router with ISDN backup driven by loss of hub or critical server ! !Copyright (C) 2001 by Vincent C Jones. All Rights Reserved. version 11.0 ! hostname Spoke123 ! username Backup password Secret123 ! isdn switch-type basic-ni1 ! interface Loopback0 description Network Management and ISDN source address ip address 10.101.23.1 255.255.255.255 ! interface Ethernet0 description spoke 123 LAN ip address 10.1.23.1 255.255.255.0 ! interface Serial0 no ip address bandwidth 56 encapsulation frame-relay ! interface Serial0.21 point-to-point ip address 10.101.23.13 255.255.255.252 bandwidth 56 delay 2000 frame-relay interface-dlci 21 broadcast ! interface BRI0 ip unnumbered Loopback0 encapsulation ppp bandwidth 56 delay 5000 no keepalive isdn spid1 21255501230000 isdn spid2 21255510100000 dialer idle-timeout 170 dialer map ip 10.0.0.10 name Backup speed 56 broadcast 18005551111 dialer hold-queue 10 dialer-group 1 ppp authentication chap ! router eigrp 1 network 10.0.0.0 no auto-summary ! ip host TestISDN 10.0.0.10 ip classless ip route 0.0.0.0 0.0.0.0 10.0.0.1 200 ! Use frame if up ip route 0.0.0.0 0.0.0.0 10.0.0.10 210 ! Otherwise, get a backup link up ip route 10.0.0.10 255.255.255.255 BRI0 ip route 10.0.24.7 255.255.255.255 10.0.0.10 210 ! Try ISDN to server ! logging 10.0.130.50 access-list 102 deny eigrp any any access-list 102 permit ip any any dialer-list 1 protocol ip list 102 ! end