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160 Chapter 6: Using ISDN and DDR Technologies

Example 6-24 shows all the physical BRI interfaces associated with dialer rotary-group 2.
The number 2 is used as a rotary group number, so it must also be used as our dialer interface
number designator.

NOTE

It is important that the dialer interface designator (in this case, 2) match the dialer rotary-
group number. If these two numbers do not match, the configuration does not function properly.

Figure 6-10 depicts the concept of rotary groups.

Example 6-24

Rotary Group Configuration

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)#encapsulation ppp
RouterA(config-if)#dialer rotary-group 2
RouterA(config)#interface BRI1
RouterA(config-if)#encapsulation ppp
RouterA(config-if)#dialer rotary-group 2
RouterA(config)#interface BRI2
RouterA(config-if)#encapsulation ppp
RouterA(config-if)#dialer rotary-group 2
!
RouterA(config)#interface Dialer2
RouterA(config-if)#ip address 10.12.1.1 255.255.255.0
RouterA(config-if)#encapsulation ppp
RouterA(config-if)#dialer remote-name RouterB
RouterA(config-if)#dialer string 2145552222 class remote
RouterA(config-if)#dialer load threshold 50 either
RouterA(config-if)#dialer pool 1
RouterA(config-if)#dialer-group 1
RouterA(config-if)#ppp authentication chap
RouterA(config-if)#ppp multilink
!
RouterA(config)#ip route 10.13.1.0 255.255.255.0 10.12.1.2
RouterA(config)#dialer-list 1 protocol ip permit