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DGS-1520 Series Gigabit Ethernet Smart Managed Switch Web UI Reference Guide
163
STP Port Settings
This window is used to display and configure the STP port settings.
To view the following window, click L2 Features > STP > STP Port Settings, as shown below:
Figure 5-55 STP Port Settings Window
The fields that can be configured are described below:
Parameter Description
Unit
Select the Switch unit that will be used for this configuration here.
From Port - To Port
Select the range of ports that will be used for this configuration here.
Cost
Enter the cost value here. This value must be between 1 and 200000000. This
value defines a metric that indicates the relative cost of forwarding packets to the
specified port list. Port cost can be set automatically or as a metric value. By
default, this value is 0 (auto). Setting 0 for the external cost will automatically set
the speed for forwarding packets to the specified port(s) in the list for optimal
efficiency.
By default, port cost for 10 Mbps is 2000000, 100 Mbps is 200000, 1Gbps is
20000, 2.5Gbps is 8000, and 10Gbps is 2000. The lower the number, the greater
the probability the port will be chosen to forward packets.
State
Select to enable or disable the STP port state.
Guard Root
Select to enable or disable the Guard Root function.
Link Type Select the link type here. Options to choose from are Auto, P2P, and Shared. A
full-duplex port is considered to have a Point-to-Point (P2P) connection. The port
cannot transit into the forwarding state rapidly by setting the link type to Shared.
By default, the Auto option is used.
Port Fast
Select the Port Fast option here. Options to choose from are:
• Network - 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.
• Disable - 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.
• Edge - 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
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