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

Dialer Profiles permit distinct dialing data to be configured onto logical interfaces.  The logical interfaces might have distinct dialing destinations, various remote router names, etc., but theyll be utilizing the same physical interface.

Dialer strings are utilised on dialer profiles.  Note that every logical interface has a different IP address, a different remote router to dial, and a distinct dialer string, but they will be utilizing the same physical interface to dial out.  The commands dialer pool and dialer pool-member are employed to link the logical and physical interfaces.  The quantity following every single command must match for the logical interface to appropriately bind to the physical interface.

R1(config)#interface dialer0

R1(config-if)#ip address 172.16.1.1 255.255.255.

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

< places logical interface into dialer pool>

R1(config-if)#dialer string 5551212

< number dialed to contact router Remote0>

R1(config-if)#dialer-group 1

< links logical interface to dialer-list 1>

R1(config)#interface dialer1

R1(config-if)#ip address 172.16.1.2 255.255.255.

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

< With dialer profiles, IP addresses are assigned to logical interfaces.>

R1(config-if)#encapsulation ppp

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

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

< The number associated with this command should match the number configured with the dialer pool number on the logical dialer interfaces.>

R1(config-if)#isdn spid1 0835866101

R1(config-if)#isdn spid2 0835866301

When configuring dialer profiles, the encapsulation type must 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 tiny tricky at first, and the finest way to master this skill is to get actual hands-on practice in your own CCNA / CCNP property lab or a rack rental service. Either way, hands-on is the best practice. Finest of luck in your CCNA scientific studies! [http://paymentsavvy.com/ payment saavy]