A network administrator is configuring MST on switch SW1 with the commands: SW1(config)# spanning-tree mode mst SW1(config)# spanning-tree mst 12 root primary What is the effect after the command is entered?

A network administrator is configuring MST on switch SW1 with the commands:

SW1(config)# spanning-tree mode mst
SW1(config)# spanning-tree mst 12 root primary

What is the effect after the command is entered?

• The bridge priority on switch SW1 is set to 32768 for MST instance 12.
• The bridge priority on switch SW1 is set to 28672 for MST instance 12.
• The bridge priority on switch SW1 is set to 20480 for MST instance 12.
• The bridge priority on switch SW1 is set to 24576 for MST instance 12.

Explanation: In MST configuration, an MST instance priority can be defined in one of two methods:
spanning-tree mst instance-number priority priority , where the priority is a value between 0 and 61,440, in increments of 4096
spanning-tree mst instance-number root { primary | secondary }[ diameter diameter ], where the primary keyword sets the priority to 24,576, and the secondary keyword sets the priority to 28,672

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