D-Link DGS-1100-24P Reference Guide - Page 56

Loopback Detection, From Port / To Port, Port Fast, Network, Disabled, Apply

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D-Link DGS-1100 Series Switch User Manual Figure 7-223 STP Port Settings window The fields that can be configured are described below: Parameter From Port / To Port Port Fast Description Select the appropriate port range used for the configuration here. Select the port fast option here. Options to choose from are Network, Disabled, and Edge. In the Network mode the port will remain in the non-port-fast state for three seconds. The port will change to the port-fast state if no BPDU is received and changes to the forwarding state. If the port received the BPDU later, it will change to the non-port-fast state. In the Disable mode, the port will always be in the non-port-fast state. It will always wait for the forward-time delay to change to the forwarding state. In the Edge mode, the port will directly change to the spanning-tree forwarding state when a link-up occurs without waiting for the forwardtime delay. If the interface receives a BPDU later, its operation state changes to the non-port-fast state. By default, this option is Edge. Click the Apply button to accept the changes made. Loopback Detection The Loopback Detection (LBD) function is used to detect the loop created by a specific port. This feature is used to temporarily shut down 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 received from a port, this 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 normal 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 drop-down menu. To view the following window, click L2 Features > Loopback Detection, as shown below: Figure 7-234 Loopback Detection window 50

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D-Link DGS-1100 Series Switch User Manual
Figure 7-223 STP Port Settings window
The fields that can be configured are described below:
Parameter
Description
From Port / To Port
Select the appropriate port range used for the configuration
here.
Port Fast
Select the port fast option here. Options to choose from are
Network
,
Disabled
, and
Edge
. In the
Network
mode the
port will remain in the non-port-fast state for three seconds.
The port will change to the port-fast state if no BPDU is
received and changes to the forwarding state. If the port
received the BPDU later, it will change to the non-port-fast
state. In the
Disable
mode, the port will always be in the
non-port-fast state. It will always wait for the forward-time
delay to change to the forwarding state. In the
Edge
mode,
the port will directly change to the spanning-tree forwarding
state when a link-up occurs without waiting for the forward-
time delay. If the interface receives a BPDU later, its
operation state changes to the non-port-fast state. By default,
this option is
Edge
.
Click the
Apply
button to accept the changes made.
Loopback Detection
The Loopback Detection (LBD) function is used to detect the loop created by a specific port. This
feature is used to temporarily shut down 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
received from a port, this 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 normal
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
drop-down menu.
To view the following window, click
L2 Features > Loopback Detection
, as shown below:
Figure 7-234 Loopback Detection window
50