HP Procurve Series 4100GL Installation And Getting Started Manual page 50

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Troubleshooting
Basic Troubleshooting Tips


4-2
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. Some basic sample topologies are shown at
the end of chapter 2 in this manual.
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.
With your Series 4100GL Switches, if you wish to build redundant paths
between important nodes in your network to provide some fault toler-
ance, you should enable Spanning Tree Protocol support on the switch.
This ensures that only one of the redundant paths is active at any time,
thus avoiding data path loops. Spanning Tree can be enabled through the
switch console, the web browser interface, or HP TopTools for Hubs and
Switches.
The Series 4100GL Switches also support Trunking, which allows
multiple network cables to be used for a single network connection
without causing a data path loop. See the Management and Configura-
tion Guide that is on the documentation CD-ROM that came with your
switch for more information on Spanning Tree and on Trunking.
Connecting to devices that have a fixed full-duplex configuration.
The RJ-45 ports on the Series 4100GL Switches are all configured as
"Auto". That is, when connecting to attached devices, the switch will
operate in one of two ways to determine the link speed and the commu-
nication mode (half duplex or full duplex):
if the connected device is also configured to Auto, the switch will
automatically negotiate both link speed and communication mode
if the connected device has a fixed configuration, for example 100
Mbps, at half or full duplex, the switch will automatically sense the
link speed, but will default to a communication of half duplex
Because the Series 4100GL Switches behave in this way (in compliance
with the IEEE 802.3 standard), if a device connected to the switch has
a fixed configuration at full duplex, the device will not connect correctly
to the switch. The result will be high error rates and very inefficient
communications between the switch and the device.
Make sure that all devices connected to the Series 4100GL Switches are
configured to auto negotiate, or are configured to connect at half duplex
(all hubs are configured this way, for example).

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