D-Link DES-3226 User Manual page 90

The STP on the Switch level blocks redundant links between Switches (and similar network devices). The port level STP will
block redundant links within an STP Group.
It is advisable to define an STP Group to correspond to a VLAN group of ports.
The following fields can be set:
Parameter
Cost
Priority <128>
Migration <No>
Edge <No>
P2P <Yes>
Configure Ports from __ to __
DES-3226S Layer 2 Fast Ethernet Switch User's Guide
Description
A Port Cost can be set from 1 to 200000000. The lower the number, the greater
the probability the port will be chosen to forward packets.
Default port cost:
100Mbps port = 200000
Gigabit ports = 20000
A Port Priority can be from 0 to 240. The lower the number, the greater the
probability the port will be chosen as the Root Port.
Select Yes or No. Choosing Yes will enable the port to migrate from 802.1d STP
status to 802.1w RSTP status. RSTP can coexist with standard STP, however the
benefits of RSTP are not realized on a port where an 802.1d network connects to
an 802.1w enabled network. Migration should be enabled (yes) on ports
connected to network stations or segments that will be upgraded to 802.1w RSTP
on all or some portion of the segment.
Select True or False. Choosing true designates 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. False indicates the port does not have edge port status.
Select True or False. Choosing true indicates a point-to-point (p2p) shared link.
These 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 consecutive group of ports may be configured starting with the selected port.
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