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Chapter 4. Troubleshooting, Installation, and Replacement Procedures
4-3
Hot-Swapping 8237s
You can disconnect the Stack Link cable from an 8237 and plug it into a
replacement 8237 without powering off the other 8237s in the stack (that is, you can
hot-swap 8237s).
If you hot-swap an 8237, the ports will take 1 or 2 minutes to re-synchronize;
however, each 8237 performs repeater functions normally while re-synchronizing.
All Ethernet traffic will be disrupted during the time that the Stack Link cable is not
fully connected.
To hot-swap an 8237:
1
Disconnect the power cord from the ac outlet and then from the 8237 that is
to be replaced.
2
Unplug all the cables connected to the hub that is being replaced, making
sure to label the cables so that you will know where to reconnect them.
3
If the 8237 you are removing from the stack has an Expansion Port, and the
replacement does not, remove the Expansion Port from its slot and install it
in the replacement 8237.
Attention: Make sure that the power to an 8237 is disconnected before you
remove or install its Expansion Port.
4
Connect the cables to the ports of the replacement 8237.
5
Connect the power cord to the 8237 and then connect the other end to the
ac outlet.
Problem Determination through the Management Port
When power is applied to an 8237, a set of self-tests is performed. To review the
results of these tests, you can connect a computer that has a terminal emulation
program to the management port, remove power from the 8237 to be tested, and
then reconnect power. The result of the self-test is displayed on the terminal. For
details about terminal emulation programs, see Chapter 3, "8237 Administration."
Note that the power-on self-test (POST) first checks the validity of the microcode
before continuing with other tests. If the microcode is found to be invalid, the system
will halt and prompt for new microcode to be downloaded. For a Model 001, an
Xmodem download is requested (see Figure 4-2 on page 4-4). For a Model 002 or
Model 003, the system enters a Download menu (see Figure 4-5 on page 4-7).
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