Lab 5.5.5: ISDN BRI to BRI

Objectives:

  • Place an ISDN BRI to ISDN BRI call from a branch office to a central site.

Scenario:

Given a Central site Cisco-IOS router with ISDN BRI capability and a branch office site Cisco-IOS router with ISDN BRI capability, configure both routers so that you can place an ISDN call between your two company sites.

Notes: 

Lab Tasks:

  1. Cable the lab as shown in the diagram.
  2. The first router to be configured will be the Denver branch office router. Log into the branch office router and enter global configuration mode.
  3. Configure the following basic information into the router
    • Configure the hostname Denver on the router.
    • Configure the router to prevent the lookup of misspelled words.

    What is the command to prevent the lookup of misspelled words?

    • Configure IGRP routing with AS# 100. Ensure that no routing updates will be sent out of interface BRI 0.

    How do you prevent routing updates from being sent out an interface?

    • Configure the enable password to be cisco.
    • Configure the FastEthernet 0/0 interface with the IP address 192.168.3.1/24.

    Configure the line VTY 0 4 to request a login with the cisco password.

  4. Now it is time to configure the ISDN BRI connection! The first step will be to specify the ISDN switch type that is specified by the Phone Company. In this lab, the switch type will be National. The command to configure the switch type is:

    Denver(config)#isdn switch-type basic-ni
  5. The next step will be to configure the hostname to ip mapping and the username and password of the router to be dialed into. Continue using cisco as the password. The commands to do this are:

    Denver(config)#ip host phoenix 192.168.2.1
    Denver(config)#username Phoenix password cisco
  6. Specify what types of traffic will generate a call to the remote router. Traffic that generates a call to another router is called "interesting traffic." In this lab, any IP traffic is considered "interesting" and should generate a call. Configure a dialer-list to specify IP traffic as interesting with the following command:

    Denver(config)#dialer-list 1 protocol ip permit
  7. The Denver branch office router must have a route to the Central Site LAN. Configure a default route to the LAN interface of the Central Office router.  What is the command to do this?

  8. The final part of the configuration is to configure the BRI interface. Go to the BRI 0 interface and configure the IP address, SPID information, Dialer-group number, PPP encapsulation, and CHAP authentication. The commands to do this are:

    Denver(config)#interface bri 0
    Denver(config-if)#ip address 10.1.1.3 255.255.255.0
    Denver(config-if)#isdn spid1 51055540000001 5554000
    Denver(config-if)#isdn spid2 51055540010001 5554001
    Denver(config-if)#dialer-group 1
    Denver(config-if)#encapsulation ppp
    Denver(config-if)#ppp authentication chap

  9. Since this is an ISDN connection, there is an hourly/minute charge. For that reason, one probably does not want the circuit to be up while there is no traffic. In other words, this line should be used on an "As needed" basis. To enforce this behavior, the router needs to be told when to hang up. In this lab, if the link is idle for 60 seconds, the router should teardown the call. The command to enforce the timeout policy is as follows:

    Denver(config-if)#dialer idle-timeout 60

  10.  Lastly, the router needs to know what number to dial, next hop IP address, and name to log in with. To configure the dialer-map, issue the following command:

    Denver(config-if)#dialer map ip 10.1.1.2 name Phoenix 5551234

    Why did we use the name Phoenix?

    What does the 5551234 represent?

    Don't forget the no shutdown command!

  11. Issue the following commands to check the status of the ISDN interface and connection:

    Denver#show isdn status
    Denver#show interface bri0/0
    Denver#debug isdn q921

    Document your findings from each command below:

  12. Save your configuration. It is now time to configure the ISDN BRI interface of the Phoenix Router.

    Phoenix Configuration

  13. Configure the following basic information into the router:

    • Configure the hostname Phoenix on the router.
    • Configure the router to prevent the lookup of misspelled words.

    What is the command to prevent the lookup of misspelled words?


    • Configure IGRP routing with AS# 100. Ensure that no routing updates will be sent out of interface BRI 0.

    How do you prevent routing updates from being sent out an interface?

    • Configure the enable password to be cisco.
    • Configure the FastEthernet 0/0 interface with the IP address 192.168.2.1/24.
    • Configure the line VTY 0 4 to request a login with the cisco password.

  14. Now it is time to configure the ISDN BRI connection! The first step will be to specify the ISDN switch type that is specified by the Phone Company. In this lab, the switch type will be National. The command to configure the switch type is

    Phoenix(config)#isdn switch-type basic-ni

  15. The next step will be to configure the hostname to ip mapping and the username and password of the router to be dialed into. Continue using cisco as the password. The commands to do this are:

    Phoenix(config)#ip host denver 192.168.3.1
    Phoenix(config)#username denver password cisco

  16. Specify what types of traffic will generate a call to the remote router. Traffic that generates a call to another router is called "interesting traffic." In this lab, any IP traffic is considered "interesting" and should generate a call. Configure a dialer-list to specify IP traffic as interesting with the following command:

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

  17. The Phoenix central office router must have a route to the Denver LAN. Configure a static route to the LAN interface of the Denver router.

    What is the command to do this?

  18. The final part of the configuration is to configure the BRI interface. Go to the BRI 0 interface and configure the IP address, Dialer-group number, PPP encapsulation, and CHAP authentication. The commands to do this are:

    Phoenix(config)#interface bri 0
    Phoenix(config-if)#ip address 10.1.1.2 255.255.255.0
    Phoenix(config-if)#isdn spid1 51055512340001 5551234
    Phoenix(config-if)#isdn spid2 51055512350001 5551235
    Phoenix(config-if)dialer-group 1
    Phoenix(config-if)#encapsulation ppp
    Phoenix(config-if)#ppp authentication chap

  19. Since this is an ISDN connection, there is an hourly/minute charge. For that reason, one probably does not want the circuit to be up while there is no traffic. In other words, this line should be used on an "As needed" basis. To enforce this behavior, the router needs to be told when to hang up. In this lab, if the link is idle for 60 seconds, the router should teardown the call. The command to enforce the timeout policy is as follows:

    Phoenix(config-if)#dialer idle-timeout 60

  20. Lastly, the router needs to know what number to dial, next hop IP address, and name to log in with. To configure the dialer-map, issue the following command:

    Phoenix(config-if)#dialer map ip 10.1.1.3 name Denver 5554000

    Why did we use the name Denver?

    What does the 5554000 represent?

  21. From the Phoenix router issue the following commands:

Phoenix#debug dialer
Phoenix#ping denver
Phoenix#show isdn status
Phoenix#show isdn active

NOTE: You may need to reboot both routers after configuration.

SAVE YOUR CONFIGURATIONS, YOU WILL NEED THEM IN THE PRI LAB AND 5.5.6

Document your findings below: