CCNA Complete Guide 2nd Edition.pdf - Cisco Learning Home

- ISDN Signaling configuration on RT1 with a single remote site:
RT1(config-if)#dialer string 11111111
RT1(config-if)#^Z
RT1#
PC1
E0
172.16.1.1/24
Figure 27-2: Sample ISDN Network with Multiple Remote Sites
- However, with multiple remote sites, the dialing router must know the phone number of the sites,
as well as the phone number to use when calling to each site.
- The dialer map interface subcommand specifies the parameters to reach a destination router,
eg: next-hop address, hostname, and the phone number (dial string).
- Note: PAP or CHAP authentication is required when dialing to more than one site with ISDN.
Both authentication methods require PPP encapsulation. CHAP is used in this example.
- Since RT1 receives CHAP challenges from 2 different remote sites, thus it must know which
router is sending the CHAP request. The name {hostname} parameter in the dialer map
command tells the router which username command to use for the CHAP authentication.
- The broadcast keyword indicates whether broadcasts (eg: routing updates) can be sent across a
PPP link. It does not really forward data link broadcasts.
- ISDN Signaling configuration on RT1 with multiple remote sites:
RT1
ISDN Cloud
BRI0
10.10.10.1/29
RT1#conf t
Enter configuration commands, one per line. End with CNTL/Z.
RT1(config)#ip route 172.16.3.0 255.255.255.0 10.10.10.3
RT1(config)#access-list 101 permit tcp any host 172.16.3.2 eq ftp
RT1(config)#username RT2 password cisco123
RT1(config)#username RT3 password cisco456
RT1(config)#
RT1(config)#int bri0
RT1(config-if)#encapsulation ppp
RT1(config-if)#ppp authentication chap
RT1(config-if)#no dialer string 11111111
RT1(config-if)#dialer map ip 10.10.10.2 broadcast name RT2 11111111
RT1(config-if)#dialer map ip 10.10.10.3 broadcast name RT3 22222222
195
10.10.10.2/29
BRI0
BRI0
10.10.10.3/29
RT2
RT3
E0
172.16.2.1/24
ServerA
E0
172.16.3.1/24
ServerB
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