Place an ISDN BRI to ISDN PRI call from the branch offices to
the central site.
Scenario:
Given a Central site Cisco-IOS router with ISDN PRI capability
and branch office site Cisco-IOS routers with ISDN BRI capability,
configure all routers so that you can place an ISDN call between
your three company sites.
Notes:
Lab Tasks:
Cable the lab as shown in the diagram. Paste your BRI to BRI
configs into Phoenix and Denver.
The first router to be configured will be the Central office
router. Log into the Central office router and enter global
configuration mode.
Configure the following basic information into the router:
Configure the hostname Central 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 the enable password to be cisco.
Configure the FastEthernet 0/0 interface with the IP address
172.16.0.1/24.
Configure the line VTY 0 4 to request a login with the cisco
password.
Now it is time to configure the ISDN PRI 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:
Central(config)#isdn switch-type primary-ni
The next step will be to configure the hostname to ip mapping and
the username and passwords. 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:
Central(config)#dialer-list 1 protocol
ip permit
The Central office router must have a route to both the Phoenix
and Denver sites. Configure two static routes to the LAN interfaces
of these routers.
What are the commands to do this?
The PRI controller card must be configured to use extended super
frame, the binary 8-zero substitution linecode, and set to use all
timeslots. To configure the PRI controller issue the following
commands:
The final part of the configuration is to configure the PRI serial
interface. Go to the PRI interface and configure the IP address,
Dialer-group number, PPP encapsulation, PPP multilink, and CHAP
authentication. The commands to do this are:
Central(config)#interface serial
1/0:23
Central(config-if)#ip address 10.1.1.1 255.255.255.0
Central(config-if)#dialer-group 1
Central(config-if)#dialer load-threshold 1 outbound
Central(config-if)#encapsulation ppp
Central(config-if)#ppp multilink
Central(config-if)#ppp authentication chap
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:
Central(config-if)#dialer idle-timeout
60
Lastly, the router needs to know what numbers to dial, next hop IP
address, and name to log in with. To configure the dialer-map, issue
the following command:
Central(config-if)#dialer map ip
10.1.1.2 name Phoenix 5551234
Central(config-if)dialer map ip 10.1.1.3 name Denver 5554000
Issue the following commands to check the status of the ISDN
interface and connection:
Central#show isdn status
Central#debug isdn q921
Document your findings from each command below:
Save your configuration. It is now time to configure the Phoenix
Router.
The first step will be to configure the hostname to ip mapping the
username and password of the router to be dialed into, and a static
route to the central office LAN. Continue using cisco as the
password. The commands to do this are:
Phoenix(config)#ip host central 172.16.0.1
Phoenix(config)#username central password cisco
Phoenix(config)#ip route 172.16.0.0 255.255.0.0 10.1.1.1
The final part of the configuration is to configure the BRI
interface. Go to the BRI 0/0 interface and configure the
dialer map
command. The commands to do this are:
Phoenix(config)#interface bri 0/0
Phoenix(config-if)#dialer map ip 10.1.1.1 name central 5555000
Save your configuration. It is now time to configure the Denver
Router.
The first step will be to configure the hostname to ip mapping,
the username and password of the router to be dialed into, and a
static route to the central office LAN. Continue using cisco as the
password. The commands to do this are:
Denver(config)#ip host central
172.16.0.1
Denver(config)#username central password cisco
Denver(config)#ip route 172.16.0.0 255.255.0.0 10.1.1.1
The final part of the configuration is to configure the BRI
interface. Go to the BRI 0/0 interface and configure the dialer map
command. The commands to do this are:
Denver(config)#interface bri 0/0
Denver(config-if)#dialer map ip 10.1.1.1 name central 5555000
Save your configuration.
From the Phoenix router issue the following commands: