DXS-3400 Series Lite Layer 3 Stackable 10GbE Managed Switch Web UI Reference Guide
139
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 5-49 STP Port Settings Window
The fields that can be configured are described below:
Parameter
Description
Unit
Select the Switch unit that will be used for this configuration here.
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 option here. Options to choose from are
Auto
,
P2P
, and
Shared
. A full-duplex port is considered to have a point-to-point (
P2P
)
connection. On the opposite, a half-duplex port is considered to have a
Shared
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
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