D-Link DES-1228/ME, User Manual, Page: 114 / 267

DES-1228/ME Layer 2 Fast Ethernet Managed Switch
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Loopback Detection Settings
Figure 7- 36. Loopback Detection Settings window
Parameter Description
Loopdetect Status Use the drop-down menu to enable or disable loopback detection. The default is
Disabled.
Mode Displays the mode Port Based for the Loopback detection global settings.
The Loopback Detection function is used to detect the
loop created by a specific port. This feature is used to
temporarily shutdown a port on the Switch when a CTP
(Configuration Testing Protocol) packet has been looped
back to the switch. When the Switch detects CTP,
packets are received from a port it signifies a loop on the
network. The Switch will automatically block the port
and send an alert to the administrator. The Loopback
Detection port will restart (change to discarding state)
when the Loopback Detection
Recover Time times out.
The Loopback Detection function can be implemented on
a range of ports at a time. The user may enable or disable
this function using the pull-down menu.
To view this window click L2 Features > Loopback
Detection Settings .