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DES-3550 Fast Ethernet Layer 2 Switch
MSTI Settings
This window displays the current MSTI configuration settings 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 Configuration > Spanning Tree > MSTP Settings:
Figure 6- 25. MSTP Port Information window
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 6- 26. MSTI Settings window
Parameter Description
Instance ID <0>
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) <200000>
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 1-2000000 - Selecting this parameter with a value in the range of 1-
2000000 will set the quickest route when a loop occurs. A lower Internal cost
represents a quicker transmission.
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