Lab
9.2.3: Dial
Backup with Dialer Profiles
Objective:
Apply everything you have learned
about dial backup and dialer profiles to configure a network in
which in the event of a Frame Relay failure the branch office dials
both the central site in addition to a separate stub network office
when traffic for that site is present.
Scenario:
You have been asked to implement a
DDR dial backup link to backup the Frame Relay network between
Orlando and Atlanta. You have installed an ISDN line in Orlando to
make this possible. Now that Orlando has ISDN, you have come up with
the idea to take advantage of that line so that you can connect to
the Minneapolis office which also has an ISDN line. Configure a DDR
connection between Orlando and Minneapolis. Because Orlando will be
using the same line to connect to two different locations, you must
use dialer profiles to make this possible.
Lab Tasks:
Cable the lab as shown in the
diagram. Use the Adtran Atlas 550 as your ISDN and Frame Relay networks.
First configure your ISDN BRI lines.
Assign the appropriate SPIDs and dialer maps to implement DDR. Use
legacy DDR on the Minneapolis and Atlanta routers. Because Orlando
will be dialing two different locations, use dialer profiles.
Atlanta(config)#int bri0/0
Atlanta(config-if)#ip address 192.168.3.2 255.255.255.0
Atlanta(config-if)#encapsulation ppp
Atlanta(config-if)#ppp authentication chap
Atlanta(config-if)#dialer map ip 192.168.3.1 name Orlando
5551234
Atlanta(config-if)#dialer-group 1
Atlanta(config-if)#isdn switch-type basic-ni
Atlanta(config-if)#isdn spid1 51055540000001 5554000
Atlanta(config-if)#isdn spid2 51055540010001 5554001
Atlanta(config-if)#no shutdown
Minneapolis(config)#int bri0/0
Minneapolis(config-if)#ip address 192.168.5.2 255.255.255.0
Minneapolis(config-if)#encapsulation ppp
Minneapolis(config-if)#ppp authentication chap
Minneapolis(config-if)#dialer map ip 192.168.5.1 name Orlando
5551234
Minneapolis(config-if)#dialer-group 1
Minneapolis(config-if)#isdn switch-type basic-ni
Minneapolis(config-if)#isdn spid1 51055570000001 5557000
Minneapolis(config-if)#isdn spid2 51055570010001 5557001
Minneapolis(config-if)#no shutdown
Minneapolis(config)#dialer-list 1 protocol ip permit
Orlando(config)#int bri0/0
Orlando(config-if)#dialer pool-member 1
Orlando(config-if)#isdn switch-type basic-ni
Orlando(config-if)#isdn spid1 51055512340001 5551234
Orlando(config-if)#isdn spid2 51055512350001 5551235
Orlando(config-if)#no shutdown
Orlando(config)#int dialer 1
Orlando(config-if)#ip address 192.168.3.1 255.255.255.0
Orlando(config-if)#encapsulation ppp
Orlando(config-if)#ppp authentication chap
Orlando(config-if)#dialer remote-name Atlanta
Orlando(config-if)#dialer string 5554000
Orlando(config-if)#dialer pool 1
Orlando(config-if)#dialer-group 1
Orlando(config)#int dialer 2
Orlando(config-if)#ip address 192.168.5.1 255.255.255.0
Orlando(config-if)#encapsulation ppp
Orlando(config-if)#ppp authentication chap
Orlando(config-if)#dialer remote-name Minneapolis
Orlando(config-if)#dialer string 5557000
Orlando(config-if)#dialer pool 1
Orlando(config-if)#dialer-group 2
Orlando(config)#dialer-list 1 protocol ip permit
Orlando(config)#dialer-list 2 protocol ip permit
Now configure your Frame Relay and dial backup commands on the
Orlando and Atlanta routers.
Orlando(config)#int s0/0
Orlando(config-if)#encapsulation frame-relay
Orlando(config-if)#frame-relay lmi-type ansi
Orlando(config)#int s0/0.16 point-to-point
Orlando(config-if)#ip address 192.168.4.1 255.255.255.0
Orlando(config-if)#frame-relay interface-dlci 16
Orlando(config-if)#backup interface dialer 1
Orlando(config-if)#backup delay 30 60
Atlanta(config)#int s0/0
Atlanta(config-if)#encapsulation frame-relay
Atlanta(config-if)#frame-relay lmi-type ansi
Atlanta(config)#int s0/0.17 point-to-point
Atlanta(config-if)#ip address 192.168.4.2 255.255.255.0
Atlanta(config-if)#frame-relay interface-dlci 17
Now configure your static routes
on all of the routers that will enable communication between all
sites. Use default routes where necessary to push traffic towards
the central site.
Atlanta(config)#ip route
192.168.1.0 255.255.255.0 192.168.4.1
Atlanta(config)#ip route 192.168.1.0 255.255.255.0 192.168.3.1 200
Atlanta(config)#ip route 192.168.6.0 255.255.255.0 192.168.4.1
Atlanta(config)#ip route 192.168.6.0 255.255.255.0 192.168.3.1 200
Orlando(config)#ip route 0.0.0.0
0.0.0.0 192.168.4.2
Orlando(config)#ip route 0.0.0.0 0.0.0.0 192.168.3.2 200
Orlando(config)#ip route 192.168.6.0 255.255.255.0 192.168.5.2
Minneapolis(config)#ip route
0.0.0.0 0.0.0.0 192.168.5.1
Test connectivity from Orlando to
Atlanta via the Frame Relay link. This should be functional.
Test connectivity from Orlando to
Minneapolis via the DDR ISDN link by pinging from Orlando to
Minneapolis. This should be functional.
Once you have verified the network
is functioning properly, allow the DDR link to timeout.
Check the status of the DDR dial backup link on Orlando. What
command(s) could you use?
Disconnect the serial link from the Orlando router and then try
to ping Atlanta (192.168.2.1). You may have to ping several times.
What happens?
While continuing to ping Atlanta, mix in a few pings to
Minneapolis (192.168.6.1).
What happens?
Look at the links (lights) on
your BRI interfaces. What do you see?
Reconnect the Frame Relay link to
Orlando. Give the link some time to come back up.
From the Atlanta router, are you
able to ping Minneapolis (192.168.6.1)? Does it ping right away?
Why?
Disconnect the Frame Relay link
on Orlando again.
Try to ping Minneapolis
(192.168.6.1) from Atlanta again. Are you able to reach it? Why?
What would correct this problem?