584 Chapter 8: WAN Protocols and Design
The dialer in-band command is omitted because an ISDN BRI is used in this case. The only
new command added here is the dialer string command, which shows the phone number that
is to be used for signaling a connection. The signaling occurs on the D channel of the BRI.
When more than one site is dialed from the same interface, several dial strings are needed.
For example, Figure 8-31 adds a third site, GothamCity, to the network. The client's FTP
connections to the FTP server running on Commissioner will be considered interesting traffic
for causing dial connections to GothamCity.
Figure 8-31
Mapping Between Next Hop and Dial String
Example 8-28
SanFrancisco Configuration--Dial Now Can Occur
ip route 172.16.3.0 255.255.255.0 172.16.2.1
!
access-list 101 permit tcp any host 172.16.3.1 eq 80
!
dialer-list 2 protocol ip list 101
!
interface bri 0
ip address 172.16.2.2 255.255.255.0
encapsulation ppp
dialer string 14045551234
dialer-group 2
Clark
Lois
172.16.3.0/24
LosAngeles
172.16.2.1
BRI0
Commissioner
Barbara
172.16.4.0/24
GothamCity
172.16.2.2
BRI0
Dad
Mom
172.16.1.0/24
10.1.2.0/24
172.16.2.2
SanFrancisco
BRI0
Route to 172.16.3.0/24
Route to 172.16.4.0/24
Map 10.1.2.1 to Dial String 1
Map 10.1.2.3 to Dial String 2
ch08.fm Page 584 Monday, March 20, 2000 5:17 PM