config stp version rstp
config stp maxage 20 maxhops 20 forwarddelay 15 txholdcount 3 fbpdu enable hellotime 2 lbd enable lbd_recover_timer 60 nni_bpdu_addr dot1ad
config stp priority 32768 instance_id 0
config stp mst_config_id name 00:1C:F0:20:07:40 revision_level 0
enable stp
config stp ports 1-21,23 externalCost auto  edge true p2p auto state disable restricted_role true restricted_tcn true lbd disable
config stp mst_ports 1-27 instance_id 0 internalCost auto priority 128
config stp ports 1-21,23 fbpdu disable
config stp ports 22,24-27 externalCost auto  edge false p2p auto state enable restricted_role false restricted_tcn false lbd disable
config stp ports 22,24-27 fbpdu enable

DGS-3627G:admin#sh stp
Command: show stp

 STP Bridge Global Settings
 ---------------------------
 STP Status         : Disabled
 STP Version        : RSTP
 Max Age            : 20
 Hello Time         : 2
 Forward Delay      : 15
 Max Hops           : 20
 TX Hold Count      : 3
 Forwarding BPDU    : Enabled
 Loopback Detection : Enabled
 LBD Recover Time   : 60
 NNI BPDU Address   : dot1ad

enable loopdetect
config loopdetect recover_timer 60 interval 10 mode port-based
config loopdetect log state enable
config loopdetect ports 1 state enable
config loopdetect ports 2 state enable
config loopdetect ports 3 state enable
config loopdetect ports 4 state enable
config loopdetect ports 5 state enable
config loopdetect ports 6 state enable
config loopdetect ports 7 state enable
config loopdetect ports 8 state enable
config loopdetect ports 9 state enable
config loopdetect ports 10 state enable
config loopdetect ports 11 state enable
config loopdetect ports 12 state enable
config loopdetect ports 13 state enable
config loopdetect ports 14 state enable
config loopdetect ports 15 state enable
config loopdetect ports 16 state enable
config loopdetect ports 17 state enable
config loopdetect ports 18 state enable
config loopdetect ports 19 state enable
config loopdetect ports 20 state enable
config loopdetect ports 21 state enable
config loopdetect ports 22 state disable
config loopdetect ports 23 state enable
config loopdetect ports 24 state disable
config loopdetect ports 25 state disable
config loopdetect ports 26 state disable
config loopdetect ports 27 state disable
config loopdetect trap both
config loopdetect vlan 1-4094 state enable