D-Link DES-3250TG User Manual page 142

D-Link DES-3250TG Standalone Layer 2 Switch
in controlling broadcast storms. The best way to determine if a data loop exists is to capture traffic on a
saturated link and check if similar packets are seen multiple times.
Generally, if all the users of a given domain are having trouble connecting to the network at the same
time, a data loop can be suspected. The port utilization data in the switch's console will give unusually
high values in this case.
The priority for most cases is to restore connectivity as soon as possible. The simplest remedy is to
manually disable all of the ports that provide redundant links. Disabling ports one at a time, and then
checking for a restoration of the user's connectivity will identify the link that is causing the problem, if
time allows. Connectivity will be restored immediately after disabling a data loop.
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