HP ProCurve 2124 Install Manual page 32

Troubleshooting
Basic Troubleshooting Tips
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For more information on possible network problems and their solutions, refer
to the technical note "Troubleshooting LAN Performance and Intermittent
Connectivity Problems", which can be found on the HP Procurve web site,
http://www.hp.com/go/hpprocurve in the Information Library section.
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make sure that the port on that device is configured the same. Otherwise,
the communication over that link could have high error rates and could
be very inefficient, or the link might not be established at all.
Faulty or loose cables. Look for loose or obviously faulty connections.
If they appear to be OK, make sure the connections are secure. If that does
not correct the problem, try a different cable.
Non-standard cables. Non-standard and miswired cables may cause
network collisions and other network problems, and can seriously impair
network performance. Use a new correctly-wired cable or compare your
cable to the cable in appendix B, "Switch Ports and Network Cables" for
pinouts and correct cable wiring. A category 5 cable tester is a recom-
mended tool for every 100Base-TX network installation.
Improper Network Topologies. It is important to make sure you have
a valid network topology. Common topology faults include excessive
cable length and excessive repeater delays between end nodes. If you have
network problems after recent changes to the network, change back to
the previous topology. If you no longer experience the problems, the new
topology is probably at fault. Example topologies are shown at the end of
chapter 2 in this book, and some topology configuration guidelines can
be found online at the HP Procurve web site, http://www.hp.com/go/
hpprocurve in the Information Library section.
In addition, you should make sure that your network topology contains
no data path loops. Between any two end nodes, there should be only
one active cabling path at any time. Data path loops will cause broadcast
storms that will severely impact your network performance.