dialer-group 1
The dialer-group 1 command enables the dialer-list 1 on the BRI interface, which determines which packets will be interesting and activate the ISDN connection.
isdn spid1 408555432101 5554321
isdn spid2 408555987601 5559876
The isdn spid commands are used if your carrier assigns spids to your
ISDN lines.
ppp authentication chap
This command enables CHAP authentication.
router igrp 1
network 172.16.0.0
ip route 192.168.24.0 255.255.255.0 172.16.20.2
This IP route command creates a static route to the reote router''s network via the remote router''s BRI interface. This is required because dynamic routes are lost when the ISDN link is down.
Note: The command parameters for this example are:
192.168.24.0 = the target network.
255.255.255.0 = the target network mask. A 255 in an octet''s position specifies an exact match for that octet is required, and a 0 in an octet''s position specifies any value will match.
172.16.20.2 = the address of the next hop that can be used to reach the target network.
access-list 100 deny ip 0.0.0.0 255.255.255.255 255.255.255.255 0.0.0. 0
access-list 100 permit ip 0.0.0.0 255.255.255.255 0.0.0.0 255.255.255. 255
This access list determines which IP packets will be interesting and activate the ISDN link. The access-list you should create depends on your particular network design. Note: The command parameters for this example are:
access-list 100 deny ip 0.0.0.0 255.255.255.255 255.255.255.255 0.0.0. 0
defines all broadcast packets as uninteresting.
access-list 100 permit ip 0.0.0.0 255.255.255.255 0.0.0.0255.255.255.255
defines all other IP packets as interesting.
dialer-list 1 list 100
This command points to access-list 100, which determines which IP packets will be interesting.
line con 0
line aux 0
line vty 0 4
password test
login
!
end
Sample Configuration for C4000
C4000#wr t
######
Current configuration:
!
version 10.2
!
hostname C4000
!
enable password test
!
username C2503 password cisco (See username explanation in the followi
ng
section.)
isdn switch-type basic-dms100
!
interface Ethernet0
ip address 192.168.24.65 255.255.255.0
!
interface Serial0
no ip address
shutdown
!
interface Serial1
no ip address
shutdown
!
interface BRI0
ip address 172.16.20.2 255.255.255.0
encapsulation ppp
bandwidth 56
dialer idle-timeout 300
dialer map ip 172.16.20.1 name C2503 speed 56 broadcast 14085554321
dialer map ip 172.16.20.1 name C2503 speed 56 broadcast 14085559876
dialer hold-queue 5
dialer load-threshold 100
dialer-group 1
isdn spid1 415555123401 5551234
isdn spid2 415555678901 5556789
ppp authentication chap
!
router igrp 1
network 172.16.0.0
network 192.168.24.0
!
ip route 172.16.10.0 255.255.255.0 172.16.20.1
access-list 100 deny ip 0.0.0.0 255.255.255.255 255.255.255.255 0.0.0.
0
access-list 100 permit ip 0.0.0.0 255.255.255.255 0.0.0.0 255.255.255.
255
!
!
dialer-list 1 list 100
!
line con 0
line aux 0
line vty 0 4
password test
login
!
end
Explanation of C4000 Configuration
C4000#wr t
######
Current configuration:
!
version 10.2
!
hostname C4000
!
enable password test
!
username C2503 password cisco
The username "C2503" is the hostname of the remote router and is used
by the dialer map command below. The username is case sensitive and mu
st match the remote router''s hostname exactly.
The password, which is used by the CHAP authentication process, is cas
e sensitive and must match the remote router''s password exactly.
Note: To avoid confusion, the unencrypted form of the password cisco i
s shown in this sample configuration. In the actual configuration, the
password would appear in its encrypted form: 7 13061E010803, where 7
denotes the encryption type and 13061E010803 is the encrypted form of
the password cisco. When entering or making changes to the username co
mmand, always type the password in its unencrypted form and do not ent
er the encryption type (7). It is set automatically.
isdn switch-type basic-dms100
The ISDN switch type must match your carrier''s equipment. If you chang
e the switch-type you must reload the router for the new switch type t
o take effect.
interface Ethernet0
ip address 192.168.24.65 255.255.255.0
interface Serial0
no ip address
shutdown
