Hello. Thanks in advance for any help someone can give. I will be working on adjusting configs for 11 switches we have in an elementary school in our district. The core switch is a Cat3750 and other access switches are 3560's, 3550's and a few 2950's I believe. My initial question is about spanning-tree mode rapid-pvst. The current config on the 3750 is "....mode rapid-pvst". I received basic configs from an engineer who is redoing our other school locations. His sample has spanning-tree mode pvst. Should I use that command instead. Do all of the models of switches I listed support both of these commands and or can they play nice if one or the other commands is programmed on the switch. In other words, the rapid-pvst command is on some and the plain old mode pvst command is on other switches. Thanks in advance for any help you can provide.