Configure snapshot routing between a central router and a branch
office router.
Scenario:
The Phoenix and Denver offices want to exchange routing updates
without incurring large telecommunication bills. Your solution is to
configure snapshot routing between the two routers.
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.
Configure IGRP routing with AS# 100.
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.
Configure the ISDN BRI connection. The commands to do this
are:
Denver(config)#isdn switch-type basic-ni
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
Denver(config-if)#dialer idle-timeout 120
Denver(config-if)#dialer map ip 10.1.1.2 name phoenix broadcast
5551234
Don't forget the no shutdown command!
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. You will also need to specify a username and
password for CHAP authentication.
What is the significance of the word broadcast in the last
statement above?
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. We must
also configure a username and password for authentication. The
commands are as follows:
Verify connectivity between Phoenix and Denver. What IGRP routes
are being advertised?
Can you think of any problems with DDR and IGRP routing
updates? Why would you not want to leave this configuration as is?
Now it is time to configure snapshot routing. Phoenix will be
the server and Denver will be the client. Set the active period for 5
minutes. The command is as follows:
Phoenix(config)#interface bri 0/0
Phoenix(config-if)#snapshot server 5
The commands to configure the snapshot client in Denver are as
follows:
The
dialer map snapshot interface configuration
command establishes a map that the router uses to connect to the
Phoenix site router for the exchange of routing updates. The
snapshot client interface configuration
command sets the length of the active period to five minutes (a value
that must match the value set in the snapshot server's configuration)
and sets the length of the quiet period to 10 minutes. The
suppress-statechange-updates
keyword prevents the routers from exchanging updates during
connections that are established to transfer user data. The
dialer
keyword allows the client router to dial up the server router in the
absence of regular traffic and is required when you use the
suppress-statechange-update
keyword.
Save the configuration on both routers and then reload each
router.
Issue the command
show ip route
on each router. Document your findings.
Issue the command
show snapshot
on each router. Document your findings.
Wait a few minutes, will the Denver router dial the Phoenix
router at the end of the quiet period?
Document any other observations your group notices about
snapshot routing.