9-7
Troubleshooting
Unusual Network Activity
Troubleshooting
■ For physical layer topology guidelines:
Designing HP AdvanceStack Workgroup Networks available on the CD
shipped with your switch.
Unusual Network Activity
Network activity that exceeds accepted norms often indicates a hardware
problem with one or more of the network components, possibly including the
switch. Unusual network activity is usually indicated by the LEDs on the front
of the switch or measured with the ASCII console interface or with a network
management tool such as the HP AdvanceStack Assistant. Refer to “Diagnos-
ing with LEDs” earlier in this chapter for information on using LEDs to identify
unusual network activity.
Duplicate MAC Addresses Across VLANs. Duplicate MAC addresses on
different VLANs are not supported and can cause VLAN operating problems.
There are no explicit events or statistics to indicate the presence of duplicate
MAC addresses in a VLAN environment. However, one symptom that may
occur is that a duplicate MAC address can appear in the Port Address Table
of one port, and then later appear to be linked to another port. (This can also
occur in a LAN where there are redundant paths between nodes and Spanning
Tree is turned off.) For more information, refer to “VLAN Restrictions” on page
7-21.)
Diagnostic Tests
If you believe that the switch is not operating correctly, you can test the
switch’s circuitry by removing, then reinstalling the switch’s power cord.
This procedure power-cycles the switch and executes the switch self-test. If
the Fault LED stays on, the switch may have failed its self-test. See “Diagnosing
with the LEDs” earlier in this chapter to interpret the LED display.
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