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 por
t 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 port number 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 > MST Port Information:
Figure 6- 28.MSTP Port Information window
To view the MSTI settings for a particular port,select the
Portnumber and the Unit ID number of the switch in the switch stack,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- 29.MSTI Settings window
ParameterDescription
Instance IDDisplays 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 internal Cost 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.
Pr
iority
Enter a value betw
een 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.This entry must be divisible by 16.
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