Tuesday, April 25, 2006

Cisco CCNA Exam Tutorial: Configuring Dialer Profiles

The most common method of configuring ISDN is with dialer maps, but dial information can also be configured on a logical interface. To pass the CCNA exam, you must know how to configure and troubleshoot both dialer maps and dialer profiles.


Dialer Profiles allow different dialing information to be configured onto logical interfaces. The logical interfaces may have different dialing destinations, different remote router names, etc., but they’ll be using the same physical interface.


Dialer strings are used on dialer profiles. Note that each logical interface has a different IP address, a different remote router to dial, and a different dialer string, but they will be using the same physical interface to dial out. The commands dialer pool and dialer pool-member are used to link the logical and physical interfaces. The number following each command must match for the logical interface to correctly bind to the physical interface.


R1(config)#interface dialer0

R1(config-if)#ip address 172.16.1.1 255.255.255.0

R1(config-if)#encapsulation ppp

<. The encapsulation type is placed on both the logical and physical interfaces. >

R1(config-if)#dialer remote-name Remote0



R1(config-if)#dialer pool 1

<>

R1(config-if)#dialer string 5551212

<>

R1(config-if)#dialer-group 1

<>


R1(config)#interface dialer1

R1(config-if)#ip address 172.16.1.2 255.255.255.0

R1(config-if)#encapsulation ppp

R1(config-if)#dialer remote-name Remote1

R1(config-if)#dialer pool 1

R1(config-if)#dialer string 5551234

R1(config-if)#dialer-group 1


R1(config)#interface bri0

R1(config-if)#no ip address

<>

R1(config-if)#encapsulation ppp

<>

R1(config-if)#dialer pool-member 1

<>

R1(config-if)#isdn spid1 0835866101

R1(config-if)#isdn spid2 0835866301




When configuring dialer profiles, the encapsulation type should be placed on both the physical BRI interface and the logical dialer interfaces. The SPIDs are configured on the physical interface as well.


Configuring dialer profiles can be a little tricky at first, and the best way to master this skill is to get real hands-on practice in your own CCNA / CCNP home lab or a rack rental service. Either way, hands-on is the best practice. Best of luck in your CCNA studies!

Chris Bryant
CCIE #12933
www.thebryantadvantage.com

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