CST3607 Class Notes 2019-03-28

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Lab-03 Debriefing

  • Comparing the Routing Table Worksheet with the output of “show ip route” from each router.

Decoding the output from “show ip route”

This is one entry from: show ip route

O [110/74] via, 05:29:08, Serial0/0

ORouting protocol “OSPF” network
[110Administrative Distance (AD)
/74]OSPF cost
via hop for the /8 network
05:29:08Aging time. How long the protocol has been running?
Serial0/0Exit interface


Router Configuration Checklist

  • Identify the interfaces on the router that are going to be used.
  • Identify the directly connected networks.
  • Configure the IP address and subnet mask on only those interfaces on the router that are going to be used.
  • Enable the interface(s) : no shutdown
  • Add the routing protocol
    • Add only the network address for each “directly connected” network

Cisco IOS

  • Adding an IP address to an interface
  • Adding the RIP routing protocol
  • Troubleshooting/Status commands
  • Routing protocols
  • How to configure:
    • Serial Ports
      • DCE vs DTE
      • Clock Rate on DCE end only
      • # show controller serial0/0
      • OSPF Routing Protocol uses the Wildcard mask, instead of the subnet mask
      • DHCP via Cisco IOS
        • Set the range exclude addresses for static IP’s from the DHCP pool
  • Cisco IOS Reference

Router Simulator (RouterSim)

Lab-04: (Configuring Router interfaces, and the RIP Routing Protocol)

  • You’ll need a USB Flash drive with at least 200MB of free space to save your labs.
  • You must be in class this day in order to get full credit for completing this lab.
  • When saving, always increment the version number at the end of the filename every time you save. And, save often.
    • Starting Filename: CST3607 Lab-04 YourLastName, YourFirstName v01
  • Instructions (PDF)
  • Network Diagram (PDF)
  • The lab must be done in RouterSim
    • RouterSim is available in any of the CST computers in the Namm building. (4th & 9th floors)
  • Note: Substitute the # within an IP address with the number assigned to you in class. Use all other octets/digits, as written.
  • After you’ve verified that all of your configurations are complete and accurate, and you’re able to ping from host A to B and from B to A, and the routing tables on both routers are correct, only then e-mail your completed RSM file and configuration text file to me for grading.
    • E-mail Subject: CST3607 Lab-04 YourLastName
  • Note: Do not use “version 2” when configuring RIP
  • Important: Lab-04 is required, as it is the starting point/baseline for future labs.

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

Troubleshooting Your Lab?

  • Did you enable all the required interfaces on all the routers? no shutdown
  • Have you checked all the router interfaces to make sure that both Status and Protocol are both up? show ip interface brief
  • Did you check that the clockrate on the DCE interface is set and greater than zero?
  • Did you add only the directly connected networks to the routing protocol?
  • Did you use the interface’s IP address instead of it’s network address when configuring the routing protocol?
  • Did you use the wildcard mask, not the subnet mask, when configuring OSPF?
  • When you ping a host or router, where is the ICMP request failing to get to its destination or failing to return?
  • Still having problems? And you’re confident that your configuration is correct? Save the lab, exit RouterSim, and then reload the lab.

Study for Exam #2

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