Learning by Doing: CISCO Certified Network ... - SCN Research

Step-By-Step Instructions:
1. You should set each switch back to its factory default settings. The power should be
turned off when you are finished re-setting.
Test default Spanning Tree Settings:
1. Make sure the power is turned off on all of the switches. For ease, place each switch
on top of each other. For this lab, the top switch will be called “SW-A,” the middle
switch will be called “SW-B,” and the bottom switch will be called “SW-C.”
2. Plug one end of a crossover cable into port “Ax” on SW-A and the other end into port
“Bx” on SW-B.
3. Plug one end of a crossover cable into port “Ax” on SW-B and the other end into port
“Bx” on SW-C.
4. Plug one end of a crossover cable into port “Ax” on SW-C and the other end into port
“Bx” on SW-A. You have now created a loop in your switches.
5. Turn on the power. After the switches cycle through their start-up procedures one by
one the lights over the Ax and Bx ports should change from amber-colored (Problem
or not functioning) to green-colored (OK-operational). One of the lights should
change back to amber. This line was chosen to be the redundant backbone because
all priorities are equal in default mode.
6. Let’s test the backup line. Unplug any one of the cables that appears with green
lights on both ends. In about 60 seconds or so the redundant backbone line amber
light will turn green. This indicates the switch is going through the five STP states.
7. Plug the back up line back in…it will return back to its original state in only a couple
of seconds.
Test the ability to ping from (PC)-to (switch)-to (switch)-to (switch)-to (PC):
1. Connect a PC workstation (PC-A) to SW-A using a straight-through cable.
2. Change the TCP/IP settings to IP: 192.168.1.1 and S/M 255.255.255.0.
3. Connect a PC workstation (PC-B) to SW-B using a straight-through cable.
4. Change the TCP/IP settings to IP: 192.168.1.2 and S/M 255.255.255.0.
5. Test the connectivity from PC-A to PC-B by pinging. This should be successful.
6. Start an Ethereal capture on workstation “B.”
7. Let’s test the backup line. Unplug any one of the cables that appears with green
lights on both ends.
8. WHILE THE LIGHT IS STILL AMBER—test the connectivity from PC-A to
PC-B by pinging. It should not work.
9. Within 60 seconds the redundant backbone line amber light will turn green.
10. Test the connectivity from PC-A to PC-B again. This should be successful again.
11. Stop the capture. Let’s see what we have in figure 1.
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