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D-Link DXS-1210 Series User Manual
48
Figure 4.77 – L2 Features > STP > STP Port Settings
From Port/To Port: Enter a consecutive group of ports to be configured starting with the selected port.
Cost: This is the STP port cost, which is used to calculate the spanning tree topology. tf represents the
relative interface bandwidth and is the desirability of the link. The port cost can be set automatically or set
manually as a metric value. The default value is 0 (auto).
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. Default port cost: 100Mbps port = 200000. Gigabit
port = 20000.
Value 1-200000000: Define a value between 1 and 200000000 to determine the external cost. The
lower the number, the greater the probability the port will be chosen to forward packets.
State: Select to enable or disable port based STP. It will be selectable after STP is enabled globally on the
Switch.
Guard Root: Select to enable or disable the guard root function.
Link Type: Select the link type option. The options to choose from are Auto, P2P, and Shared. A full-duplex
port is considered to have a point-to-point (P2P) connection. A half-duplex port is considered to have a
Shared connection. The port cannot rapidly transition to the forwarding state if the link type is set to Shared.
By default this option is Auto.
Port Fast: Select the port fast option. The options are Network, Disabled, and Edge. In the Network mode
the port will remain in the non-port, fast state for three seconds. If no BPDUs are received the port will be put
into the forwarding state. If the port receives a BPDU, it will change back to the non-port fast state. This is
the default port fast mode. In the Disabled mode, the port will always be in the non-port fast state. It will wait
for the forward-time delay to change to the forwarding state. In the Edge mode, the port will directly change
to the forwarding state without waiting for the forward-time delay. If the interface receives a BPDU, its
operation state changes to the non-port fast state.
TCN Filter: Select to enable or disable the TCN filter option. Enabling TCN filtering on a port is useful for
connecting to an external network, which may not be under full control of the administrator. When a port is
set to the TCN filter mode, the topology change event received by the port will be ignored. By default, this
option is disabled.
BPDU Forward: Bridges use Bridge Protocol Data Units (BPDUs) in the operation of spanning tree, BPDU.
Forwarding is useful when a bridge interconnects two regions, with each region requiring a separate
spanning tree. BPDU filtering functions only when STP is disabled either globally or on a single interface.
The possible field values are:
Disabled: BPDU filtering is enabled on the port.
Enabled: BPDU forwarding is enabled on the port (STP must be disabled).
Priority: Select the priority of each port. Selectable range is from 0 to 240, and the default setting is 128.
The lower the number, the greater the probability the port will be chosen as a root port.
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