CST3607 Class Notes 2018-11-06

Study for Exam #2

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  • At this point in the semester, you should be confident in your understanding of Cisco IOS, routing protocols, etc., that you can complete this lab, using only the network diagram as your guide, with 100% accuracy, and a reasonable amount of time. About 15 to 20 minutes.
  • If that’s not the case, then you must practice, practice, practice, to gain that skill and confidence.
  • Practice makes improvement.


  • The labs use dynamips or GNS3 as a simulator/emulator.
  • Has the .net file with the router layouts and the configurations for each lab.

Lab-04 Debriefing

  • Make sure to bring your completed Lab-04 simulation file to class.

Document the configuration of each router in your lab

  • How to save the output from commands from a router
  • Create a new TXT file with the same filename as the simulation file you’re documenting. syntax: CST3607 Lab-04 LastName, FirstName v<version #>.txt
  • At the top of the TXT file, type your CST3607 Lab-04 <YourLastName>, <YourFirstname>
  • Paste the output from all routers into the one TXT file:
    1. Make sure all routers have uniquie names: e.g. hostname 2621-A, 2621-B, etc.
    2. Close and reopen the CLI, to clear its history.
    3. enable
    4. terminal length 0
    5. show ip interface brief
    6. show ip route
    7. show ip protocol
    8. show ip ospf neighbor {If you’re using OSPF}
    9. show controllers s0/0 or s0/1 {If the router has a DCE interface}
    10. show ip dhcp binding {If the router is acting as a DHCP server}
    11. show run {Make sure to press the space bar to complete the listing if the CLI says “More”}
    12. Right-click in the CLI and choose copy. (In RouterSim, it’s not necessary to highlight the text first.)
    13. Switch to your TXT file, and paste
    14. Save the TXT file.
    15. Repeat for each router in the lab.
  • Send the TXT file with your router configurations to me: Subject: CST3607 Lab-04 YourLastName, Firstname

Cisco IOS

OSPF Router ID

The OSPF Router-ID is used to identify a specific device within an OSPF database. Router ID’s must be unique to prevent unintended OSPF database problems.

OSPF Loopback Interface

  • A router with one loopback interface generates a router-LSA with Type-1 link (stub network).

Configuring a Gateway of Last Resort Using IP Commands

Lab-05: (Serial, OSPF, DHCP)

  • Requires your 100% accurate and working Lab-04 as the starting point.
  • Increment the version number at the end of the filename every time you “Save As.” And, “Save As” often.
  • Network Parameters (rtf)
    • Complete this chart before proceeding with the lab. Use the block size (256 – interesting octet) to see which subnet an IP address fits into.
  • Instructions (PDF)
  • Network Topology Diagram (PDF)
  • Substitute the # within an IP address with the number assigned to you in class.
  • Make sure that:
    • You’ve verified that all of the configurations / parameters / network addresses / IP’s are complete and 100% accurate. (show run)the IP address and mask of each interface is correct“Status” and “Protocol” are both “up” for each enabled interface. (show ip interface brief)You’re able to ping all hosts, in both directions.The routing tables on all routers show the correct number of connected and indirect networks. (show ip route)For RIP: The network addresses and subnet masks under “Routing for Networks” are correct. (show ip protocol)For OSPF: The network addresses, wildcard masks, and area #’s under “Routing for Networks” are correct. (show ip protocol)The DCE has a clock rate set and greater than zero: show controllers s0/0 or s0/1At least one neighbor shows up with OSPF on every router. (show ip ospf neighbor)Only then is your lab considered complete.Note: show ip ospf neighbor, by not work on 2621-C, but will on the other 3 routers.
  • You should then e-mail only your final completed simulation file, and documentation TXT file to me.
    • The TXT file should have the same filename, including the version number, as the simulation file.E-mail Subject: CST3607 Lab-05 YourLastName, YourFirstName
  • Cisco IOS and Router Command Reference


  • Complete Lab-05, along with the documentation file, and send them to me ASAP.
  • E-mail Subject: CST3607 Lab-05 YourLastName

Study for Exam #2

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