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:
Cable the lab as shown in the diagram.
The first router to be configured will be the Denver branch
office router. Log into the branch office router and enter global
configuration mode.
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.
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
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:
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
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?
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:
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
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!
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:
Save your configuration. It is now time to configure the ISDN
BRI interface of the Phoenix Router.
Phoenix Configuration
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.
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
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:
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
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?
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:
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
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?
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