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

connection to the root switch. That is why we have added a fourth switch to this lab.
Now each switch will not have a direct connection so we will have to do some
research first. At this point no changes have been made to our switches (ie. we are
still set to factory defaults). Turn on each switch (make sure there are no cable
connections to any switch). Put a console cable from the switch console port into
your PC workstation.
2. Start hyperterminal (9600-8-N-1). Follow these choices: (1) select [I] for IP
configuration or (2) select [M] for menus, [N] for network management, [I] for IP
configuration, and then write down the MAC address of the switch (it will appear as
“Ethernet address”):
SW-A ____-____-____-____-____-____
SW-B ____-____-____-____-____-____
SW-C ____-____-____-____-____-____
SW-D ____-____-____-____-____-____
***Don’t forget to move the console cable to the console port of each switch. Right now
you cannot telnet into each switch easily. It is quicker just to move the console
cable.***
3. From these MAC addresses you should be able to determine which switch by default
will be the root bridge. Calculate which crossover cable will be selected as the
backup line from their MAC addresses. Circle lowest MAC address as 1 st , next to
lowest as 2 nd , etc.
root
bridge backup line
SW-A Ax Bx 1 st 2 nd 3 rd 4 th
SW-B Ax Bx 1 st 2 nd 3 rd 4 th
SW-C Ax Bx 1 st 2 nd 3 rd 4 th
SW-D Ax Bx 1 st 2 nd 3 rd 4 th
The backup line will be the line between the highest two MAC addresses (3 rd and 4 th ).
(The light on Ax for 3 rd will be amber).
4. Turn off the power to the switches and remove the console cable.
5. Plug one end of a crossover cable into port “Ax” on SW-A and the other end into port
“Bx” on SW-B.
6. Plug one end of a crossover cable into port “Ax” on SW-B and the other end into port
“Bx” on SW-C.
7. Plug one end of a crossover cable into port “Ax” on SW-C and the other end into port
“Bx” on SW-D.
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