HP E3800-24G-2SFP+ Installation And Getting Started Manual page 77

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 HP ProCurve Manager.
The E3800 switches 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 for your switch
at www.hp.com/networking/support.
■ 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 for your switch at
www.hp.com/networking/support.
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