In networks with some devices using MAC address reduction, and others not using MAC address reduction, STP parameters do not necessarily propagate to ensure that the spanning tree topologies match. You should manually check the STP configuration to ensure that the primary, isolated, and community VLANs' spanning tree topologies match.
am I to understand that if I am using a root bride, it should be the same for primary and isolated vlan. and therefore if spanning tree is to be used it has to be consistently used for both primary and isolated.
what is the meaning of mac address reduction ? is the document reffing to aging time out, which again if changed from default must be consistent for both primary and isolated.