Spanning Tree


OBJECTIVE: In this lab you will become familiar with following concepts:

For more information:




  1. Complete Work on SPT-Lab
  2. IMPORTANT: We have been experiencing problems with Xyplex Servers. You can directly connect your computer to the Switch [1].

Submission (everything must be typed / use computer / don't forget cover sheet):

  1. Draw a complete diagram of the network (do not include the server, Xyplex6 etc.) Include the following in your diagram (your diagram must look something like this; make sure all the details are shown):
    1. All cable types, MAC addresses, IP addresses,
    2. Switch ports and their MAC address, Switch ID, Which port is blocked and which is forwarding,
    3. Hub ID (MAC),
    4. The direction which the packet travels when you run a ping command (you can show this for only one PC). This must match your MAC-Table you obtained from the switch - this will be the spanning-tree.
    5. Switch/Hub Type (e.g., Cisco model)
    6. For each PC make sure you indicate the Eth, its IP address, and PC name (e.g., A)
  2. You do not have to answer any of the questions in the Lab.


[1] How to connect the PC directly to the Switch using Serial Interface

  1. Connect the 9-pin serial interface on the PC directly to the Switch using a serial (BLUE) cable. You do not need any adaptors on the switch side.
  2. Login as su
  3. From command prompt, type: minicom -s
  4. You need to setup the port first:
    1. Go to SERIAL PORT SETUP and change serial device to /dev/ttyS0
    2. Change Bps to 9600 8N1
    3. Then, save the file as 3500cisco
    4. exit (control A then q; you may need to press control z)
  5. From command prompt, type: minicom 3500cisco