HP ProCurve Series Installation And Getting Started Manual page 67

Troubleshooting
Basic Troubleshooting Tips
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.
For your switch, if you wish to build redundant paths between important
nodes in your network to provide some fault tolerance, you should enable
Spanning Tree Protocol support on the switch. This ensures 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 ProCurve Manager.
The Series 3500yl Switch devices also support Trunking, which allows
multiple network cables to be used for a single network connection
without causing a data path loop. For more information on Spanning Tree
and Trunking, see the Management and Configuration Guide, which is
on the ProCurve Web site at www.procurve.com. See page 5-1 for details.
■ Check the port configuration. A port on your switch may not be
operating as you expect because it has been put into a "blocking" state by
Spanning Tree, GVRP (automatic VLANs), or LACP (automatic trunking).
(Note that the normal operation of the Spanning Tree, GVRP, and LACP
features may put the port in a blocking state.) Or, the port just may have
been configured as disabled through software.
Use the switch console to determine the port's configuration and verify
that there is not an improper or undesired configuration of any of the
switch features that may be affecting the port. For more information, see
the Management and Configuration Guide, which is on the ProCurve
Web site at www.procurve.com. See page 5-1 for details.
5-3