D-Link DES-3010G - Loopback Detection

DES-3010F/DES-3010FL/DES-3010G/DES-3018/DES-3026 Fast Ethernet Switch Manual
Loopback Detection
The Loopback Detection function is used to identif
y
loops occurring between the Switch and a device
that is directly connected to it. This process is
accomplished by the use of a Configuration Testing
Protocol (CTP) packet that is generated by the
switch. Users may set the dispatching time interval
of the CTP packet and once a CTP packet has
returned to the port from where it originated, the
Loopback Detection function will disable this por
t
until the anomaly has ceased, and the loopbac
k
occurrence will be noted in the Switch’s log. Once
the loopback problem has stopped, this port will be
automatically recovered in a time period that ca
n
also be specified by the user.
To configure the settings for the Loopbac
k
Detection feature, click the Loopback Detection
link, located in the L2 Features folder, which will
open the following window for the user to
configure.
Figure 7- 16. Loopback Detection window
The following fields may be configured:
Parameter Description
Loopdetect Status
Choose whether to globally enable or disable the Loopback Detection function by using this
pull down menu.
Interval
Enter a time interval, between 1 and 32767 seconds, that CTP packets will be dispatched from
Loopback Detection enabled ports. If this packet is returned, the port will be disabled. The
default setting is 10 seconds.
Recover Time
Enter a time, in seconds that a port will have to wait before being recovered from a Loopback
Detection shutdown. The user may set a time between 60 and 1000000 seconds with a default
setting of 60 seconds. The user may also enter a time of 0 which means that the port can only
be recovered manually by the user. This is done by going to the Port Configuration folder
located in the Administration folder and manually enabling these ports using the Port
Settings window.
From… To
Choose a port or group of ports that are to be enabled for the Loopback Detection function.
State
Use the pull-down menu to enable or disable the Loopback function for the selected ports.
Click Apply to implement changes made.
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