I inherited a small setup for a VM complex. It is centrally connected via a Juniper EX Switch Stack (as a virtual chassis). Connected to it via lag/trunks (carrying all the same vlans) are 4 Dell blade chassis with integrated switches (6348). The Juniper has RSTP enabled however nothing specific configured.
The Dell chassis switches do not have spanning-tree enabled, and chassis3 (which is an older chassis than the 6348) is being elected root bridge currently.
Is there any good reason spanning-tree would be disabled in this setup or was this just a bad setup from the beginning?