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DGS-3700-12/DGS-3700-12G Series Layer 2 Gigabit Ethernet Switch User Manual

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Figure 3 - 61 STP Instance Settings - View window

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:

Figure 3 - 62 MSTP Port Information window

The following parameters can be viewed or set:

Parameter Description

Port

Use the drop-down menu to select a port.

Instance ID Displays the MSTI ID of the instance being configured. The range is from 0 to 15. An entry of 0

in this field denotes the CIST (default MSTI).

Internal Path cost

(1-200000000)

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 to 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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D-Link DGS-3700 User Manual Page 125