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4 Configuration
The fields that can be configured are described below:
Item
From Port / To Port
Port Fast
Click Apply to make the configurations take effect.
Click Refresh to renew the window.
L2 Features > Loopback Detection
The Loopback Detection function is used to detect loops created by a specific port while Spanning Tree
Protocol (STP) is not enabled in the network, especially when the down links are hubs or unmanaged
switches. The Switch will automatically shut down the port. The looping port will be unlocked when the
Loopback Detection Recover Time times out. Loopback Detection can also be enabled or disabled for a
specified range of ports simultaneously.
Figure 4.43 - L2 Features > Spanning Tree > STP Port Settings
Description
Select the range of ports to be included in the spanning tree port
group.
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 Disabled 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. The default option is Network.
Table 4.24
D-Link Smart Managed Switch User Manual
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