D-Link xStack DGS-3426P User Manual - Mstp Port Information

xStack DGS-3400 Series Layer 2 Gigabit Ethernet Managed Switch 

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 the following window, click Layer 2 Features > 

Spanning Tree > MSTP Port Information: 

Figure 7- 39. MSTP Port Information 

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 on its hyperlinked MSTI ID, which will reveal the following 

window.  

Figure 7- 40. MSTI Settings 

The user may configure the following parameters: 

Parameter                       Description 

Instance ID  

Displays the MSTI ID of the instance being configured. An entry of 0 in this field denotes the 

CIST (default MSTI). 

Internal Cost 

(0=Auto)  

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. 

Priority  

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. 

Click Apply to implement changes made. 

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