D-Link DMS-1100 Series User Manual
60
Figure 4.74 – L2 Features > STP > STP Port Settings
The fields that can be configured for
STP Port Settings
are described below:
Item
Description
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. It 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
Disabled
and
Edge
. 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.
