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CHANGE REQUEST On the EdgeRouter Lite, when STP is enabled on a bridge interface, the default bridge priority is 0. Please consider changing the default STP Bridge priority from 0 to 32768 to match the defaults of other major switch manufacturers. JUSTIFICATION The STP bridge priority is used to determine which bridge (switch) will win an election to become the STP Root bridge.
The switch running STP with the lowest priority value will become the Root Bridge. Having the ERL use a default STP priority of 0 may cause unexpected behaviour for users accustomed to the defaults used by other manufacturers. Changing the default priority from 0 to 32768 will address these concerns. I can not immedately think of an environment where an ERL would be the preferred STP Root over another switch so having the default be 0 seems aggressive.
Typically a 'core' switch is manually configured to become the STP Root by lowering its configured priority but it is hard to go lower then 0 in order to beat the default of the ERL. HOW TO REPRODUCE ( below behaviour confirmed on ERL versions 'v1.5.0' and 'v1.6.0rc2' ) Create a bridge, enable STP, and assign it to a physical interface. (do not specify a priority value) ubnt@ubnt:$ configure ubnt@ubnt# set interfaces bridge br0 stp true ubnt@ubnt# set interfaces ethernet eth0 bridge-group bridge br0 ubnt@ubnt# commit ubnt@ubnt# save ubnt@ubnt# exit Running 'show bridge' displays the priority value (in hex) as the first part of the 'bridge id' ubnt@ubnt:$ show bridge bridge name bridge id STP enabled interfaces br0 0000.dc9fxxxxb9de yes eth0 A packet capture confirms that EdgeMax is using the above bridge-id in its BPDU frames.