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

Dialer Profiles allow different dialing details to be configured onto logical interfaces.  The logical interfaces may have different dialing destinations, distinct remote router names, and so forth., but theyll be using the very same physical interface.

Dialer strings are utilized on dialer profiles.  Note that each and every logical interface has a various IP address, a various remote router to dial, and a diverse dialer string, but they will be employing the very same physical interface to dial out.  The commands dialer pool and dialer pool-member are employed to link the logical and physical interfaces.  The number following every single command have to 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.

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.two 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 ought to be placed on each 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 very first, and the finest way to master this ability is to get genuine hands-on practice in your own CCNA / CCNP residence lab or a rack rental service. Either way, hands-on is the very best practice. Very best of luck in your CCNA studies! [http://www.paymentsavvy.com/travel-merchant-account read travel agency merchant account]