Configuring Dialer Profiles with DDR


Tip:

Using a dial map applies the configuration directly to the interface. Using a dialer profile allows you to have a more dynamic configurationthe physical interface will act differently depending on your specific call requirements, such as the following:

  • Do you want HDLC encapsulation instead of PPP?

  • Do you want an extended ACL rather than a standard one?

  • Do you want a different idle-timeout threshold?


Step 1: Configure static routes on router.

 

Using static routes rather than dynamic routing will save on ISDN costs. The link will not always be up because routing updates trigger link to remain become active

 

Edmonton#config t

 
 

Edmonton(config)#ip route 172.16.30.0 255.255.255.0 172.16.20.2

 

Step 2 (Option 1): Define interesting traffic without access lists.

  
 

Edmonton(config)#dialer-list 1 protocol ip permit

 
 

Edmonton(config)#int dialer 0

Go to virtual dialer interface as opposed to physical BRI 0 interface

 

Edmonton(config-if)#dialer-group 1

 

Step 2 (Option 2): Define interesting traffic with access lists.

  
 

Edmonton(config)#dialer-list 2 protocol ip list 150

 
 

Edmonton(config)#access-list 150 deny udp any any eq tftp

 
 

Edmonton(config)#access-list 150 deny tcp any any eq telnet

 
 

Edmonton(config)#access-list 150 permit ip any any

 
 

Edmonton(config)#int dialer 0

Go to virtual dialer interface as opposed to physical BRI 0 interface.

 

Edmonton(config-if)#dialer-group 2

 

Step 3: Configure DDR dialer information.

  
 

Edmonton(config)#username Calgary password academy

For PPP encapsulation across ISDN (optional)

 

Edmonton(config)#int dialer 0

 
 

Edmonton(config-if)#ip address 172.16.20.1 255.255.255.0

 
 

Edmonton(config-if)#int bri 0

 
 

Edmonton(config-if)#encap ppp

Turns on PPP encapsulation

 

Edmonton(config-if)#ppp authentication chap

Turns on CHAP authentication

 

Edmonton(config-if)#dialer idle-timeout 150

Specifies the number of seconds after last interesting traffic is sent before the call terminates. Default is 120 seconds.

Step 4: Configure dialer information.

  
 

Edmonton(config)#int dialer 0

Enters dialer interface

 

Edmonton(config-if)#dialer remote name Calgary

 
 

Edmonton(config-if)#dialer string 5552000

 

Step 5: Associate dialer profile.

  
 

Edmonton(config)#interface bri 0

 
 

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

Or 2 if using dial-group 2

 

Edmonton(config-if)#interface dialer 0

 
 

Edmonton(config-if)#dialer pool 1

Or 2 if using dial-group 2





CCNA Self-Study(c) CCNA Portable Command Guide
CCNA Portable Command Guide
ISBN: 1587201585
EAN: 2147483647
Year: 2006
Pages: 261
Authors: Scott Empson

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