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414 Chapter A: Answers to the "Do I Know This Already?" Quizzes and Q&A Sections
21
Configure both routers A and B so that a second B channel is initialized if the first reaches
50 percent saturation in either direction. Also, the call should disconnect after 30 seconds
of idle time. Note: This is not a dial backup situation.
!RouterA
interface bri0
dialer load-threshold 127
dialer idle-timeout 30
!RouterB
interface bri0
dialer load-threshold 127
dialer idle-timeout 30
22
Configure Router C for T1 PRI connectivity using B8ZS and ESF. Configure the
appropriate IP addressing on interface S 0:23.
!RouterC
controller t1 0
framing esf
linecode b8zs
pri-group timeslots 1-23
interface s0:23
ip address 172.17.1.3 255.255.255.0
23
Now assume that Router C is being implemented in an E1 environment using the default
settings for framing and linecode. Make the appropriate configuration changes.
!RouterC
controller e1 0
framing crc4
linecode hdb3
pri-group timeslots 1-30
interface s0:15
ip address 172.17.1.3 255.255.255.0
24
Remove the static routes between A and B. Implement a solution that enables dynamic
routing without keeping the link up constantly.
!RouterA
isdn switch-type basic-ni1
Interface e0
ip address 172.16.1.1 255.255.255.0
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
snapshot server 5 dialer
dialer map snapshot 1 name RouterB 9726785677
ppp Multilink
isdn spid1 97255567890101 9725556789
isdn spid2 97255567880101 9725556788