Hello,
the rotary-group command is used to associate multiple physical interfaces with one specific dialer interface. All physical interfaces in the same rotary group have the same characterisics as the associated dialer interface. Let´s say you have BRI0 and BRI1 and you want those two interfaces to be associated with dialer interface 1. So in interface configuration mode you would configure:
Router(config)#interface bri0
Router(config-if)#dialer rotary-group 1
Router(config)#interface bri1
Router(config-if)#dialer rotary-group 1
The rotary group number corresponds with the dialer interface, 1 in this case.
The dialer pool-member command associates physical interfaces with dialer interfaces as well, but the physical interfaces can be associated with more than one dialer interface, hence allowing the physical interface to be used with multiple configurations.
Let´s say you have two BRI interfaces and four dialer interfaces (whereby all of the dialer interfaces have different configurations), you configure the following, which allows all dialer interfaces to use both physical BRI interfaces:
interface BRI0
dialer pool-member 1
dialer pool-member 2
dialer pool-member 3
dialer pool-member 4
interface BRI1
dialer pool-member 1
dialer pool-member 2
dialer pool-member 3
dialer pool-member 4
!
interface Dialer 1
dialer pool 1
!
interface Dialer 2
dialer pool 2
!
interface Dialer 3
dialer pool 3
!
interface Dialer 4
dialer pool 4
HTH,
Georg
