> | Lab 12.5.1 Rip convergence challenge Estimated time: 60 min. Objectives: Gain experience and knowledge of routing protocols Work with and compare static routes and dynamic routes Understand the process of convergence Background: As a system administrator, there will be times when configuring static routes can be very useful. Static routes are useful for stub networks because there is only one way to get to that network. Security is another reason to use static routes, if you have a network or networks that you don't want the rest of the network to be able to "see" you would not want RIP or other routing protocols sending periodic updates to other routers. With simple networks (few routers) it is sometimes more efficient to use static routes since it conserves bandwidth on WAN links. In this lab you will use static routes for troubleshooting purposes and to see their relationship to dynamic routes and routing protocols. Tools / Preparation: Prior to starting this lab you will need to have the equipment for the standard 5-router lab available (routers, hubs, switches, cables, etc.). The routers should be pre-configured by the instructor or lab assistant with the correct IP interface settings etc. RIP should be enabled on all routers. The workstations should also be pre-configured to have the correct IP address settings prior to starting the lab. The routers, hubs and workstations should be labeled. Work in teams of 3 or more. Before beginning this lab you may want to review Chapter 18 in the Cisco Networking Academy First-Year Companion Guide and Semester 2 On-line Chapter 12. Resources Required: 5 PC workstations (min.) with Windows operating system and HyperTerminal installed. 5 Cisco Routers (model 1600 series or 2500 series with IOS 11.2 or later). 4 Ethernet hubs (10BASE-T with 4 to 8 ports). One Ethernet switch (Cisco Catalyst 1900 or comparable). 5 serial console cables to connect workstation to router console port (with RJ45 to DB9 converters). 3 Sets of V.35 WAN serial cables (DTE male/ DCE female) to connect from router to router. CAT5 Ethernet Cables wired straight through to connect routers and workstations to hubs and switches. AUI (DB15) to RJ45 Ethernet transceivers (Quantity depends on the number of routers with AUI ports) to convert router AUI interfaces to 10BASE-T RJ45. Websites Sites Required: Routing basics General information on routers 2500 series routers 1600 series routers Terms and acronyms IP routing protocol IOS command summary Notes: Step 1 - Show ip route. Verify that RIP is enabled and there are no static routes on any of the routers. If there are static routes then remove them with the no IP route xxx.xxx.xxx.xxx command in global config mode. Step 2 - Enable debugging on Lab-D. When you use the command debug ip rip you will be able to see all routing updates the router is receiving and sending. Turn on debugging on Lab-D. Step 3 - Shut down the serial 1 interface on Lab-B. Shutdown the serial 1 interface on Lab-B with the shutdown command. Watch the debugging information on Lab-D and issue the show ip route command there. Has the output from the command show ip route changed from when you issued the command in step1? Which networks are inaccessible? Step 4 - Converged network. After about 5 minutes issue the show ip route command on Lab-D. Are the networks that were inaccessible in question 2 listed in the output from the show ip route command? Step 5 - Enter static routes. Bring Lab-B's serial 1 interface back up. Then enter static routes for all five routers leaving RIP enabled. Issue the show ip route command. Your output from the show ip route command should look like this: Note that there are no R-RIP entries in the routing table.
> Lab-D#show ip route Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default U - per-user static route, o - ODR Gateway of last resort is not set C 204.204.7.0/24 is directly connected, Serial1 S 223.8.151.0/24 [1/0] via 204.204.7.1 S 201.100.11.0/24 [1/0] via 204.204.7.1 S 219.17.100.0/24 [1/0] via 204.204.7.1 S 192.5.5.0/24 [1/0] via 204.204.7.1 S 199.6.13.0/24 [1/0] via 204.204.7.1 S 205.7.5.0/24 [1/0] via 204.204.7.1 C 210.93.105.0/24 is directly connected, Ethernet0
Step 6 - Shut down the serial 1 interface on Lab-B. After you shutdown the serial 1 interface on Lab-B watch the debugging information on Lab-D. Do you see any information that would let you know that Lab-B’s serial 1 interface is down? Why or why not? Step 7 – Turn off debugging on Lab-D. Turn off debugging on Lab-D using the undebug all command. Now that you have a good understanding of static routes, what are the benefits of dynamic routes?