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Implementing Basic DDR 149
Passive Interfaces
Static routes used in place of dynamic routing functions also allow the link to be dropped.
However, you must take care in your configuration.
To continue the discussion, an IGRP example is used; consider the basic IGRP/DDR
configuration in Example 6-10.
Example 6-9
Optional Configuration Parameters
RouterA(config)#interface BRI0
RouterA(config-if)#ip address 10.12.1.1 255.255.255.0
RouterA(config-if)#encapsulation ppp
RouterA(config-if)#dialer idle-timeout 180
RouterA(config-if)#isdn spid1 21455511110101 2145551111
RouterA(config-if)#isdn spid2 21455511120101 2145551112
RouterA(config-if)#isdn answer 2145552222
RouterA(config-if)#isdn answer 2145552223
RouterA(config-if)#dialer map ip 10.12.1.2 2145552222
RouterA(config-if)#dialer map ip 10.12.1.2 2145552223
RouterA(config-if)#dialer-group 1
!
RouterA(config)#dialer-list 1 protocol ip permit
!
RouterA(config)#ip route 10.13.1.0 255.255.255.0 10.12.1.2
Example 6-10
Passive Interface Justification
RouterA(config)#isdn switch-type basic-5ess
!
RouterA(config)#interface ethernet 0
RouterA(config-if)#ip address 10.11.1.1 255.255.255.0
!
RouterA(config)#interface BRI0
RouterA(config-if)#ip address 10.12.1.1 255.255.255.0
RouterA(config-if)#encapsulation ppp
RouterA(config-if)#dialer idle-timeout 180
RouterA(config-if)#isdn spid1 21455511110101 2145551111
RouterA(config-if)#isdn spid2 21455511120101 2145551112
RouterA(config-if)#isdn answer 2145552222
RouterA(config-if)#isdn answer 2145552223
RouterA(config-if)#dialer map ip 10.12.1.2 2145552222
RouterA(config-if)#dialer map ip 10.12.1.2 2145552223
RouterA(config-if)#dialer-group 1
!
RouterA(config)#access-list 101 permit tcp any any eq telnet
RouterA(config)#access-list 101 permit tcp any any eq ftp
RouterA(config)#access-list 101 permit tcp any any eq ftp-data
!
RouterA(config)#dialer-list 1 protocol ip list 101
!
continues