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Answers to Chapter 6 Q&A Section 415
router rip
network 172.16.0.0
network 172.17.0.0
network 172.18.0.0
passive-interface bri0
exit
dialer-list 1 protocol ip permit
!RouterB
isdn switch-type basic-ni1
Interface e0
ip address 172.19.1.2 255.255.255.0
interface bri0
encapsulation ppp
ip address 172.17.1.2 255.255.255.0
dialer map ip 172.17.1.1 broadcast 9725556789
dialer map ip 172.17.1.1 broadcast 9725556788
dialer load-threshold 127
snapshot client 5 720 dialer
dialer map snapshot 1 name RouterA 9725556789
ppp Multilink
isdn spid1 97267856770101 9726785677
isdn spid2 97267856780101 9726785678
exit
router rip
network 172.17.0.0
network 172.18.0.0
network 172.19.0.0
passive-interface bri0
exit
dialer-list 1 protocol ip permit
25
Configure Router A and B so that the ISDN link is activated only in cases in which the
HDLC link is down or has reached 85 percent capacity. The backup timers for failure are
at your discretion.
!RouterA
interface serial 0
ip address 172.18.1.1 255.255.255.0
backup interface bri 0
backup delay 5 60
backup load 85 4
interface bri0
encapsulation ppp
ip address 172.17.1.1 255.255.255.0
dialer map ip 172.17.1.2 broadcast 9726785677
dialer map ip 172.17.1.2 broadcast 9726785678
dialer load-threshold 127
ppp Multilink
isdn spid1 97255567890101 9724446789
isdn spid2 97255567880101 9725556788
!RouterB
interface serial 0
ip address 172.18.1.2 255.255.255.0