Hi All, Our switch network needs to be migrated from PVST+ to MST in order for our Cisco switches to be able to speak RSTP to some non-cisco switches. Given that we have a few hundred vlans configured, is there some best practice to determine how many instances we need or can we basically do whatever we want? For example: Option 1/ If we have 500 vlans, do we split them into two instances (instance 1 vlan 1-250 and instance 2 vlan 251-500). Options2/ Or would you split the vlans up based on their business requirements. Eg: vlan 1,10,100 Marketing-related vlans, vlan 2,20,200 Sales-related vlans - therefore create instance 1 vlan 1,10,100 and instance 2 vlan 2,20,200??? Secondly, what if you went with option 2, and added a new vlan into Marketing (eg: vlan 1000). Would you have to manually update the spanning-tree mst config on all MST switches to include the new vlan in the instance??? Thanks. Andy
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