D-Link DGS-1250 Series - STP Port Settings

DGS-1250 Series Gigabit Ethernet Smart Managed Switch Web UI Reference Guide
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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 5-36 STP Port Settings Window
The fields that can be configured are described below:
Parameter Description
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. The
default 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. The default port cost for a 100Mbps port is 200000, a Gigabit port is
20000, and a 10 Gigabit port 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, this option is Auto.
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 Network.