RSTP loop detection and recovery

Hi alteholz 

Welcome to Community!

There is diferent between RSTP and L2 Loop Protection, this is two different feature.

RSTP is used in scenario that all switches support spanning-tree in the network, L2 Loop Protection is used for connect one non-support spanning-tree device(like: Hub).

For RSTP: it will not D-disable port when detect there is loop in the topology, only change port status to Discard, and will recover automatically if the Loop is broken.

For L2 Loop Protection: it will D-disable port when detect there is loop in the topology, and if you want to Recover it automatically, you can set the 'Recovery Timer' to a specific value(by default: it's 0, mean not recover automatic).

And on GC728X switch, it will eanble RSTP and disable L2 Loop Protection feature by default. We don't suggest eanble these two protocol meanwhile, as it's conflict. 

So please check the configuration of 'Switching->STP' page and 'Switching-L2 Loop Protection' page on your switch, suggest enable RSTP and disable L2 Loop Protection.

Hope it helps!

Regards,

EricZ