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Configuration D-Link Web Smart Switch User Manual
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Figure 4.42 – L2 Functions > Spanning Tree > STP Port Settings
From Port/To Port: A consecutive group of ports may be configured starting with the selected port.
State: Use the drop-down menu to enable or disable STP by per-port based. It will be selectable after the
global STP is enabled.
External Cost: This 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).
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.
Migrate: Setting this parameter as Enabled will set the ports to send out BPDU packets to other bridges,
requesting information on their STP setting. If the Switch is configured for RSTP, the port will be capable to
migrate from 802.1D-98 STP to 802.1D-2004 RSTP. Migration should be set as enabled on ports connected
to network stations or segments that are capable of being upgraded to 802.1D-2004 RSTP on all or some
portion of the segment.
Edge: Select True to designate the port as an edge port. Edge ports cannot create loops. However, an edge
port can lose edge port status if a topology change creates a potential for a loop. An edge port normally
should not receive BPDU packets. If a BPDU packet is received, it automatically loses edge port status.
Select False to indicate that the port does not have edge port status. Select Auto to indicate that the port
have edge port status or not have edge port status automatically.
Priority: Specify 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.
P2P: Select Force True to indicate a point-to-point (P2P) shared link. P2P ports are similar to edge ports.
However, they are restricted in that a P2P port must operate in full-duplex. Like edge ports, P2P ports
transition to a forwarding state rapidly thus benefiting from RSTP. A P2P value of Force False indicates that
the port cannot have P2P status. Auto allows the port to have P2P status whenever possible and operate as
if the P2P status were true. If the port cannot maintain this status, (for example, if the port is forced to half-
duplex operation) the P2P status changes to operate as if the P2P value were Force False. The default
setting is Auto.