Im about to pull my hair out. I have two 3500xl switches running IOS c3500xl-c3h2s-mz.120.5.bin and both switches have deemed themselves the root. On one switch I lowered the priority,max age,hello, and forward and left the other one at its defaults. Root guard is turned off on both switches, running in transparent mode, no bpduguard. No portfast on the ports that are linked to each other, duplex and speed are the same for both. No other Vlans, just the native vlan1. I am overlooking something and cannot figure it out. Any ideas?