cnap: semester 2 ver. 2.1

CNAP: Semester 2 ver. CNAP: Semester 2 ver. 2.12.1

Introduction to Router ConfigurationsIntroduction to Router ConfigurationsOr, “What The Heck Does Or, “What The Heck Does ThatThat Line Do?” Line Do?”

Bob Meyers, CCNA, CCAI

Youngstown State University

Sept. 2000

RE Meyers, CCNA, CCAI 2

Semester 2 ObjectivesSemester 2 ObjectivesSemester 2 ObjectivesSemester 2 Objectives

Configure all routers and PC’s given the teacher topology.

Build and configure a complete network given an IP addressing space and a topology.

Troubleshoot connectivity problems in both topologies.


Learning ProblemLearning ProblemLearning ProblemLearning Problem

It’s hard to accomplish the objectives if you do not understand what each line of a running configuration means to network connectivity.


Learning Problem Learning Problem SolutionSolution

Learning Problem Learning Problem SolutionSolution

Look at each line of a properly configured CNAP Teaching Topology.

Determine how each line contributes to the complete connectivity of the working Teacher Topology.

Examine what IOS programming commands enable the running configuration results.


Teaching TopologyTeaching TopologyTeaching TopologyTeaching TopologyDon’t even thinkthink about starting a project

without a clean copy of the topology and interface charts!

Unless you enjoy getting totally lost ...


How to use the How to use the presentationpresentation

How to use the How to use the presentationpresentation

Each slide lists lines of the configuration, with an explanation next to it in black black font.

Some of the configuration commands listed are not covered in the CCNA.

Those lines will be highlighted in blueblue, and can be ignored for now. A brief description will be given of those lines for the curious.

The “notes view” of each slide has the configuration listed and line numbered.

Line numbering does not occur when programming or viewing the configuration. It is done here for convenience!


Configuration for Configuration for Router Lab-ARouter Lab-A

Configuration for Configuration for Router Lab-ARouter Lab-A

1. !

2. version 12.0

3. service timestamps debug uptime

4. service timestamps log uptime

5. no service password-encryption

6. !

7. hostname Lab-A

8. !

9. enable secret 5

$1$qBZW$2VeiHaAEdG89KRwYu3LEF1

10. !

11. no ip subnet-zero

1. Line separator/comments

2. The Cisco IOS version in use.

3. Timestamps debugging messages

4. Time since system reboot.

5. Stops encryption of ALL passwords.

6. Line separator; comments 7. Name given to the router.8. Separator9. Encrypted enable mode password.

10. Separator11. Disables ability to recover

addresses lost when sub netting.


Lab-A Configuration (cont.)Lab-A Configuration (cont.)Lab-A Configuration (cont.)Lab-A Configuration (cont.)

12. ip host Lab-B 201.100.11.2 219.17.100.1 199.6.13.1

13. ip host Lab-C 199.6.13.2 223.8.151.1 204.204.7.1

14. ip host Lab-D 204.204.7.2 210.93.105.1

15. ip host Lab-E 210.93.105.2

16. ip host Lab-A 192.5.5.1 205.7.5.1 201.100.11.1

17. !

12–16. “DNS” resolution.

Resolves the router name to the IP addresses that are configured on that router’s interfaces.

Allows you to just type in the name of the router when using telnet. The router compares the name to this table and routes the telnet session according to the IP’s listed here.

17. Separator


Lab-A Configuration Lab-A Configuration (cont.)(cont.)


18. !

19. !

20. interface Ethernet0

21. ip address 192.5.5.1

255.255.255.0

22. no ip directed-broadcast

23. no shutdown

24. !

25. interface Ethernet1

26. ip address 205.7.5.1

255.255.255.0


28. no shutdown

29. !

18. Separator

19. Separator

20. Configure the first Ethernet port, E0

21. Assign IP and subnet mask to Ethernet

port E0

22. All IP directed broadcasts are dropped

23. Forces the port to stay open/up.

24. Separator

25. Configure the second Ethernet port, E1

26. Assigns IP and Subnet mask to Ethernet

port E1

27. All IP directed broadcasts are dropped

28. Forces the port to stay open/up.

29. Separator




30. interface Serial0

31. ip address 201.100.11.1

255.255.255.0


33. no ip mroute-cache

34. no fair-queue

35. clockrate 56000

36. no shutdown

37. !

38. interface Serial1

39. no ip address


41. shutdown

42. !

30. Configure first serial port S0

31. Assigns an IP and subnet mask to serial

port S0

32. All IP directed broadcasts are dropped.

33. Disables IP multicast fast switching.

34. Disables S0 traffic priority management.

35. Sets S0 clock rate at 56KBps

36. Keeps S0 up. Prevents shutdown.

37. Separator

38. Configure second serial interface S1.

39. No layer 3 address is assigned.

40. All IP directed broadcasts are dropped.

41. S1 is administratively forced to shutdown.

42. Separator




43. router rip

44. network 192.5.5.0

45. network 201.100.11.0

46. network 205.7.5.0

47. !

48. no ip classless

49. !

43. Starts RIP routing protocol

44 – 46. Tells the router to send and accept RIP updates to and from the IP networks listed.

47. Separator 48. Discards packets for a subnet

that fall within its subnetwork addressing scheme if there is no such subnet number in the routing table and there is no network default route.

49. Separator




50. !

51. line con 0

52. password cisco

53. login

54. transport input none

55. line aux 0

56. line vty 0 4

57. password cisco

58. login

59. !

60. end

50. Line separator

51. Configure the console port.

52. Create the password “cisco”

53. Assign it to the console login

54. VTY sessions only on this port.

55. Configure the first aux port.

56. Allow 5 simultaneous telnet sessions.

57. Create the password “cisco”

58. Assign it to Telnet login sessions.

59. Separator

60. End of configuration.


““Plain English” Line by Line Plain English” Line by Line Explanation.Explanation.


1. Separator2. Cisco IOS version currently in use.3. Put a time on each debug message.4. Start a timer to show how long the

router’s been running.5. Don’t encrypt all the passwords, just do

the ones I select as secret.6. Separator7. The name given to the router.8. Separator (again)9. The privileged mode password after it’s

been encrypted for secrecy.10. Pay attention – this is a line separator.11. Subnet the way we learned it, and lose the

first and last subnets.12. These are the IP addresses that are used by

a router named Lab-B

13. These are the IP’s used by the router named Lab –C

14. Guess who uses these IP addresses?

15. Guess again.

16. Guess one more time.

17. I’m not telling you again about the “separator.”

18. I mean it.

19. I really mean it!

20. Time to configure the first Ethernet port, E0.

21. Here’s the IP and the subnet for the port.

22. Stop all IP broadcasts right here!

23. Please don’t let E0 shutdown make me crazy wondering why I can’t connect.




24. I refuse to answer.

25. Get the second ethernet port, E1, ready for configuration.

26. Give E1 this IP and subnet address.

27. Stop all IP broadcasts from entering this port from the LAN.

28. Don’t shutdown this port. Please?

29. See 24.

30. Get the first serial port, S0, ready for configuration.

31. Assign this IP and subnet mask to S0.

32. Stop those @##$* IP broadcast messages!

33. Do not allow fast switching – whatever the heck it is anyway.

34. Don’t use the fancy packet management system on this interface, ‘cause I don’t know how it works – yet.

35. S0 is DCE connection, so it needs to provide the clock rate. 56,000 Bps sounds like a good number.

36. If this interface shuts down I’ll lose my link to all the other routers. So don’t.

37. See 29.

38. Let’s configure the second serial interface, S1. Hey if it’s second, why is it labeled S1?

39. I’m not using it so don’t give it an IP.

40. Stop those pesky IP broadcasts again. Even though I’m still not using this port.

41. Not using it you say? Then shut it down.




42. You talking to me?

43. This router will now use RIP as the routing protocol.

44. Accept, and send routing updates, to and from this network address.

45. Do it on this network address, too.

46. Ditto.

47. Still means what it did 5 slides ago!

48. There’s a way to recover the 2 lost addresses when sub netting, but don’t use it till we learn it.

49. Running out of clever retorts for this sucker.

50. Ask one more time and I’m outta here.

51. Configure the console port.

52. Make “cisco” a password.

53. Take the password “cisco” and make it the login challenge when anybody connects to the console port.

54. There are other ways to use the console port, but let’s make a terminal program the only thing the port will recognize.

55. Open the AUX port for configuration. But don’t do anything to it.(?)

56. Configure all incoming Telnet sessions, and limit them to 5 simultaneous connections (0, 1, 2, 3, 4).

57. Create the password “cisco.” You can use any other alphanumeric string if you want.

58. Use “cisco” as the password for all incoming Telnet login challenges.

59. I warned you, didn’t I?

60. Outta here.


The other router The other router configurations can be configurations can be

analyzed the exact same analyzed the exact same way. Try it for yourself!way. Try it for yourself!

The other router The other router configurations can be configurations can be

analyzed the exact same analyzed the exact same way. Try it for yourself!way. Try it for yourself!

END

cnap: semester 2 ver. 2.1

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