Mstp Port Information - D-Link DGS-3427 - xStack Switch - Stackable Product Manual

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MSTP Port Information

This window displays the current MSTP Port Information and can be used to update the port configuration for an MSTI ID. If a
loop occurs, the MSTP function will use the port priority to select an interface to put into the forwarding state. Set a higher
priority value for interfaces to be selected for forwarding first. In instances where the priority value is identical, the MSTP
function will implement the lowest MAC address into the forwarding state and other interfaces will be blocked. Remember that
lower priority values mean higher priorities for forwarding packets.
To view this window, click L2 Features > Spanning Tree > MSTP Port Information, as shown below.
To view the MSTI settings for a particular port, select the Port number, located in the top left hand corner of the screen and click
Apply. To modify the settings for a particular MSTI Instance, click its hyperlinked MSTI ID, which will reveal the following
window.
The user may configure the following parameters:
Parameter
Instance ID
Internal Cost
(0=Auto)
Priority (0-240)
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DGS-3400 Series Layer 2 Gigabit Ethernet M anaged Sw itch
Figure 3 - 52 MSTP Port Information window
Figure 3 - 53 MSTP Port Information – Edit window
Description
Displays the MSTI ID of the instance being configured. An entry of 0 in this field denotes the
CIST (default MSTI).
This parameter is set to represent the relative cost of forwarding packets to specified ports
when an interface is selected within a STP instance. The default setting is 0 (auto). There
are two options:
0 (auto) – Selecting this parameter for the internalCost will set quickest route automatically
and optimally for an interface. The default value is derived from the media speed of the
interface.
value 1-200000000 – Selecting this parameter with a value in the range of 1-200000000 will
set the quickest route when a loop occurs. A lower Internal cost represents a quicker
transmission.
Enter a value between 0 and 240 to set the priority for the port interface. A higher priority will
designate the interface to forward packets first. A lower number denotes a higher priority.
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