We tried MST as well and as soon as one switch was up on MST the other switches would cause it to stop forwarding traffic. We did try shutting down the entire network, bring up a switch at a time configuring MST. We brought up a second switch and were able to convert to MST. We brought up a THIRD switch and before we could configure it, the other two switches went down. It seems the only way to get MST configured on a large network would be to bring up a switch at a time - convert it - shut it down and then move to the next switch. Not sure we are going to try that as this location has 19 IDFs and if it didn't work... We have the following on our Cisco 2960x switches spanning-tree mode rapid-pvst spanning-tree loopguard default spanning-tree portfast edge default spanning-tree portfast edge bpduguard default no spanning-tree optimize bpdu transmission spanning-tree extend system-id spanning-tree backbonefast What should we set our Meraki Trunks to? Options are - Disabled - Root guard - BPDU Guard - Loop Guard I'm asking because I have been in networking for 30 years but never had to really address spanning tree as we have been 100% standard Cisco and the core always won the contest for root spanning-tree vlan 1-4094 priority 61440
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