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
This window displays the current MSTP Port Information and can be used to update the port c onf ig urati on f or an MST I
ID. If a loop occurs, the MSTP function will use the port priority to select an interface to put into the forwardin g 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 addr ess into t he f orwar ding sta te and o ther in ter fac es will
be blocked. Remember that lower priority values mean higher priorities f or 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 packet s to specified ports
when an interface is selected within a STP instance. The default setting is 0 (a uto). T here are
two options:
0 (auto) – Selecting this param eter for the internalCost will set quickest r oute automatically
and optimally for an interface. The default value is derived fr om the media speed of the
interface.
value 1-200000000 – Selecting this parameter with a value in t he r ang e 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 priorit y for the port interface. A hig her priority will
designate the interface to forward packets first. A lower number denotes a h igher priority.
Click Apply to implement changes made.