QTech QSW-2900 - Spanning-Tree Mst External Cost; Spanning-Tree Mst Instance Cost; Spanning-Tree Mst Instance Port-Priority; Show Spanning-Tree Mst Config-ID

 spanning-tree mst link-type
 spanning-tree mst external cost
 spanning-tree mst instance cost
 spanning-tree mst instance port-priority
 show spanning-tree mst config-id
 show spanning-tree mst instance interface
Following commands：
spanning-tree mst forward-time；
spanning-tree mst hello-time；
spanning-tree mst max-age；
spanning-tree mst portfast；
spanning-tree mst link-type
Refer to corresponded commands of SST：
spanning-tree forward-time；
spanning-tree hello-time；
spanning-tree max-age；
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