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keyword, broadcast, that specifies that routing updates should be allowed to flow across
the link. Without the broadcast keyword, routing updates would not reach across the
cloud.

Dialer pool--Individual dialer interfaces that make use of a dialer pool. The dialer pool
is a group of one or more physical interfaces associated with a logical interface. A physical
interface can belong to multiple dialer pools. Contention for a specific physical interface
is resolved with a configured priority.

When implementing dialer profiles with PPP, you must define specific parameters for the
physical interface. The physical interface definition uses only the encapsulation, authentication,
ppp multilink, and dialer pool configuration parameters. All other settings are applied to the
logical interface and applied to that interface as needed for specific calls. Dialer profiles support
both PPP and HDLC encapsulation on the physical interface.

You can create a number of dialer interfaces on each router. Valid interface designations include
numbers ranging from 1 through 255. Each logical dialer interface contains the complete
configuration for a destination logical network and any networks reached through it. In other
words, multiple physical interfaces can be forced to share a common set of characteristics.
Example 6-22 shows a sample configuration for dialer profiles.

Example 6-22

Dialer Profile Configuration Example

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 pool-member 1
RouterA(config-if)#ppp authentication chap
RouterA(config-if)#ppp multilink
!
RouterA(config)#interface Dialer1
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)#map-class dialer remote
RouterA(config-map-class)#dialer isdn speed 56
!
RouterA(config)#ip route 10.12.1.2 255.255.255.255 Dialer1
RouterA(config)#ip route 10.13.1.0 255.255.255.0 10.12.1.2
RouterA(config)#dialer-list 1 protocol ip permit