CS 386M Lab 1 Router Configuration and Routing

Transcription

1 CS 386M Lab 1 Router Configuration and Routing In this lab you will learn: PartA Cisco 2600 Router Configuration Static Routing PartB 30 min Dynamic Routing PartC 40 min Explore! Components used in this lab: 2 computers with Microsoft Windows Cisco Systems Catalyst 2900 Series Switch 1 Cisco 2600 Router Required Reading 1. Study this handout. 2. RIP (Textbook pp ) Time: 2 hrs 50 min Part A: Cisco Router Configuration Time: 50 min Introduction Cisco routers are powered by the Cisco Internetwork Operating System (IOS) that allows the routers to be configured to perform specific tasks. Before you start the configuration of a Cisco Router, you must understand the two EXEC modes available on a router: user EXEC mode and privileged EXEC mode. User mode allows you to perform basic trouble shooting tests, telnet to remote hosts, and list router system information. You know that the router is in this mode if the prompt is the router name followed by the greater than sign: RouterName>. Privileged mode, sometimes called enable mode, allows for full router configuration and advanced troubleshooting. RouterName# is an example of the privileged mode prompt. If you log into a router via a console or telnet connection, you enter user mode. Privileged mode requires that you issue the enable command. Before you actually configure a Cisco router, you must understand the two main configuration modes: global configuration mode and interface configuration mode. You use global configuration mode to configure router settings that affect overall router operations. This is accomplished by the command configure after you are in the privileged mode. If you wish to configure a particular interface, you must use interface configuration mode. To enter this mode, you need to be in the global configuration mode. You then enter the interface command followed by the name and number of the interface you wish to enter. If the router is in global configuration mode, the prompt will be 1

2 RouterName (config) # while in interface configuration mode it will be RouterName(config-if)#. In this lab for each group of 3 students, there will be one designated router, one switch, two PCs running Windows, and several Ethernet cables. It is the goal of this lab to accustom you to the basic set up of a router. Most of the tasks require only one person typing; let one person do the typing for one section and let the other two do the typing for the next sections in turn. You will configure the router to obtain the topology in the following diagram. Hyper Terminal PC1 PC2 SwitchA GroupA LAN A Router A Router B WAN SwitchB GroupB LAN B PC3 PC4 Hyper Terminal Lab Setup 1. One PC per group will be connected through the serial port to the router. One end of the Ethernet cable will be plugged into the console port of the router and the other end will be connected to the COM1 port of the PC. 2. Each group has a switch and router along with Ethernet cables (one for connecting the PC to the switch, one for connecting the switch to the router, and a crossover cable common to both groups for connecting the two routers together) Task 1 Use the program HyperTerminal to log on to the router 2

3 1. Verify that the router is turned off. 2. Launch HyperTerminal at Start, Programs, Accessories, Communication, HyperTerminal. You will now need to configure HyperTerminal so that it communicates with the router out of COM1. 3. Type router for the Connection Description Name. 4. In the Connect To window the fourth field is titled "Connect Using:" Scroll down to select COM1, and then click OK. 5. Confirm and change if necessary the following settings in the COM1 Properties window that pops up. Bits Per Second: 9600 Data Bits: 8 Parity: None Stop Bits: 1 Flow Control: Xon/Xoff 6. Click OK. At the bottom left of the window, it should say "Connected" with a running count of the time for which the connection has been active. 7. Turn on the router. Observe the boot-up procedure displayed in HyperTerminal. This lists information about the hardware, as well as the initial configuration. We will modify this configuration. (Explore!) 8. Note that there are two Ethernet interfaces at the back of the router. These interfaces should already each be currently assigned an IP address. You can see this by executing the command show interfaces. You can type the? command at any time to receive context sensitive help. Task 2 Reset router configuration Because we are unsure of the validity of the current configuration of the router, we need to erase it and configure it by ourselves. To erase the current configuration, we must be in Privileged Mode. 9. Type enable to enter Privileged Mode. 10. Type the password given on the chalkboard and press enter when prompt. The prompt should now end with #. 11. Type erase startup-config to clear the current configuration that resides on the router. (Note: Wait, it takes some time) 12. Confirm that you wish to erase nvram file system and wait till it completes 13. Type reload and confirm. This reboots the router and allows the changes to take effect. (Note: Wait, this also takes some time) 14. Type no if asked to save changes. Task 3 Configure the router 3

4 Once the router has finished booting up, you will be in the System Configuration Dialog. 15. Type yes to enter. 16. Type no to skip the basic management setup. 17. Type yes to see the current interface summary. 18. Type in the name of your group for the host name. (GroupA or GroupB) 19. Type in the password given on the chalkboard for the enable secret. 20. Type in the same password for the enable password. It will tell you not to use the same password, but it is okay, just type it in again. 21. Type in the same password for the virtual terminal password. 22. Type no to configuring the SNMP Network Management. 23. Type yes to configure IP. 24. Type no to IGRP and RIP routing, and bridging and configuring Async lines. 25. Type yes to configure the FastEthernet 0/0 interface. 26. Type yes to use the RJ-45 connector. 27. Type yes to full duplex mode. 28. Type yes to configure IP on the interface. 29. Use the following IP addresses for the two interfaces of each router to answer the next prompts. Interface Names Router A Router B Subnet Mask FastEthernet 0/ FastEthernet 0/ Similarly configure the FastEthernet 0/1 interface. 31. Press Enter to save the newly created configuration. (do it yourself) 32. Type show interfaces. 33. Verify that the IP addresses were correctly assigned. (do it yourself) 34. Connect the host machines to the switch and connect the switch to the FastEthernet 0/0 interface of the router using Ethernet cables. 35. Setup the host machines to have the required IP addresses as below and the correct gateway as below. (do it yourself. Hint: Use network properties in Windows) 36. From your host, ping the other host on your network. (refer post lab 3) Group A IP Address Subnet Mask Gateway Computer Computer Group B IP Address Subnet Mask Gateway Computer Computer

5 One of the nice things about the Cisco IOS is the ability to query for command syntax. For example if you don t know what arguments are accepted for the show command, type show? and a list of possible arguments is displayed. (Explore!) Part B: Static Routing Time: 30 min The remaining part of this lab is to connect the two routers of Group A and Group B together so that machines in Group A and machines in Group B can communicate with each other. The remainder of router configuration will be done via the Ethernet interface of each host. 1. Use the other PC that is not running HyperTerminal to telnet to the router interface that is connected to your switch. (do it yourself) 2. Type the password given on the board when prompted. We will now set up a static routing table in each of the two routers. The idea is for the table to indicate that the other group's network can be reached via the 0/1 interfaces of both routers. To create a static entry in the routing table of the router, you must be in Configuration Mode. 3. Enter privileged mode and type config terminal. (do it yourself) 4. Using the command ip route to set up the static routing table. (do it yourself) The three values that this command takes are: 1. destination network/subnet number, 2. its subnet mask, and 3. the IP address of the next hop that can reach the destination network. How would each group set up an entry in the routing table in its router so that machines in Group A can access machines in Group B and vice versa? 5. By pinging a host from a host of the other group, verify that the static routing table has been created, and hosts from both groups should be able to communicate with each other. 6. To view the routing table, type show ip route. (Post Lab 1) (Does this command work in the mode that you are in? find that out by typing show?. If the command is not available, change the mode.) 7. Gain information about the topology of our network: Type tracert on a host within your group's network; record the information that is returned. Now execute a tracert command on a host in the other group. Exercise1: list the entries in the routing table. Exercise2: record the output of the trace routes. 5

6 Part C: Dynamic Routing using RIP Time: 40 min Task 1 Set up RIP 1. Delete all routing table entries using no ip routing followed by ip routing. 2. Type router? to see what routing update protocols are supported by this IOS. 3. Use the command router rip to select RIP as the routing update protocol. (do it yourself) Then, specify each of the network interfaces to which the router is directly connected. As an example, if a router has interfaces connected to the networks and The following configuration shows how to set up a RIP process in the router. router rip network network Change modes if necessary. 5. Ping the other group. Task 2 Observe RIP 6. See it happen! Use the console port of the router to view the routing tables being sent and received with: debug ip rip (do it yourself) 7. Don t forget to do this command when you are done: undebug all (Explore! How fast does RIP detect if a link goes down? How does RIP compare with the other routing protocols available on this router?) Exercise 4: Record the new routing table. Exercise 5: Record how RIP sets up the routing table. (Step 5 above) 6

7 Post Lab (To be submitted in class on Tue, March 5) 1. Explain the entries in the static routing table obtained from Exercise1. 2. Explain the path obtained in Exercise2. 3. How was host1 able to ping host2 without configuring the routing table in Part A step 36? 4. What strategy would you use to set up an access list? (Would you use the more specific rules on top or the more general rules in the beginning?) 5. Explain what you recorded in Exercise Here is a list of commands you have used. Write a sentence about each. enable reload show interfaces ip route config terminal router rip show running-config show ip interfaces 7. List the things that you learned through this lab and list what you learned through exploration. 7