Using Dialer Interfaces for DDR

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R4(config)# interface bri 0/0 R4(config-if)# no ip address R4(config-if)# encapsulation ppp R4(config-if)# dialer pool-member 1

R4(config-if)# exit

R4(config)# dialer-list 1 protocol ip permit R4(config)# interface dialer 1

R4(config-if)# ip address 172.16.14.1 2 55.255.255.252 R4(config-if)# encapsulation ppp R4(config-if)# dialer string 8140010 R4(config-if)# dialer remote-name R1

R4(config-if)# dialer pool 1 R4(config-if)# dialer-group 1

R4(config-if)# exit

R4(config)# dialer-list 2 protocol ip list 102 R4(config)# access-list 102 permit tcp any any eq smtp R4(config)# interface dialer 2

R4(config-if)# ip address 172.16.30.1 2 55.255.255.252 R4(config-if)# encapsulation ppp R4(config-if)# dialer string 9650001 R4(config-if)# dialer remote-name CentralOffice

R4(config-if)# dialer pool 1 R4(config-if)# dialer-group 2 R4(config-if)# exit R4(config)# interface serial 0/0 R4(config-if)# backup interface dialer 1

© 2001, Cisco Systems, Inc. All rights reserved. Cisco CCIE Prep v1.0—Module 3-21

The second goal was to allow e-mail transfer to the Central Office. This goal is accomplished with the use of a second dialer interface. Here the only traffic allowed to bring up the link (interesting traffic) is Simple Mail Transfer Protocol (SMTP), which is used to send e-mail. Assign an IP address to this interface, as well as the dialer string used to reach the destination, which has a remote name of CentralOffice. Finally, specify this dialer interface to be a member of pool 1 to use the physical BRI 0/0 interface when needed.

Dialer profiles are extremely versatile and can help accomplish goals not ordinarily obtained through the use of Legacy DDR. Another advantage is that dialer profiles are easy to configure and implement.

R4(config)# interface bri 0/0 R4(config-if)# encapsulation ppp R4(config-if)# ppp authentication chap

R4(config)# interface dialer 1 R4(config-if)# encapsulation ppp R4(config-if)# ppp authentication chap

• There are certain configuration commands that must be configured on both the dial and physical interface.

© 2001, Cisco Systems, Inc. All rights resi

Cisco CCIE Prep v1.0—Module 3-20

When using dialer profiles there are certain configuration commands that must be configured on both the physical interface, as well as the logical interface. In the previous examples, the command encapsulation ppp was used on the physical, as well as the dialer interfaces. If you perform PPP authentication, such as CHAP authentication, the command ppp authentication chap is required on both the physical and the logical interfaces.

R4(config)# interface bri 0/0 R4(config-if)# no ip address R4(config-if)# encapsulation ppp R4(config-if)# ppp authentication chap R4(config-if)# dialer pool-member 1 R4(config-if)# exit

R4(config)# dialer-list 1 protocol ip permit R4(config)# interface dialer 1

R4(config-if)# ip address 172.16.14.1 255.255.255.252 R4(config-if)# encapsulation ppp R4(config-if)# ppp authentication chap R4(config-if)# dialer string 8140010 R4(config-if)# dialer remote-name R1 R4(config-if)# dialer pool 1 R4(config-if)# dialer-group 1 R4(config-if)# exit

R4(config)# dialer-list 2 protocol ip list 102

R4(config)# access-list 102 permit tcp any any eq smtp R4(config)# interface dialer 2

R4(config-if)# ip address 172.16.30.1 2 55.255.255.252

R4(config-if)# encapsulation ppp

R4(config-if)# ppp authentication chap

R4(config-if)# dialer string 9650001

R4(config-if)# dialer remote-name CentralOffice

R4(config-if)# dialer pool 1

R4(config-if)# dialer-group 2

R4(config-if)# exit

R4(config)# interface serial 0/0

R4(config-if)# backup interface dialer 1

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