Stp Port Settings - D-Link xStack DGS-3200-10 User Manual

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STP Port Settings

STP can be set up on a port per port basis.
To view the following window, click L2 Features > Spanning Tree > STP Port Settings:
It is advisable to define an STP Group to correspond to a VLAN group of ports.
The following STP Port Settings fields can be set:
Parameter
From Port
To Port
External Cost
(0=Auto)
P2P
Restricted TCN
Migrate
State
®
DGS-3200 Series Layer 2 Gigabit Ethernet Managed Switch
Figure 3 - 45. STP Port Settings window
Description
The beginning port in a consecutive group of ports to be configured.
The ending port in a consecutive group of ports to be configured.
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).
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 and the default port cost for a Gigabit port is 20000. Enter 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.
Choosing the True parameter indicates 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 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 False. The default setting for this
parameter is Auto.
Topology Change Notification is a simple BPDU that a bridge sends out to its root port to
signal a topology change. Restricted TCN can be toggled between True and False. If set to
True, this stops the port from propagating received topology change notifications and
topology changes to other ports. The default is False.
When operating in RSTP mode, selecting Yes forces the port that has been selected to
transmit RSTP BPDUs.
This drop-down menu allows you to enable or disable STP for the selected group of ports.
The default is Enabled.
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