Hi , hi, we have recently had a problem with network loops despite running stp - rstp protocol.

 

I don't have much experience with dell switches. I usually worked on extreme or cisco. and there it was usually enough to turn on stpd globally and run on the port to disable some redundant port. It's probably a bit different here.

 

an unmanageable switch was connected to ports 6 and 8, which resulted in the change of the root bridge and the triggering of a loop. I wonder why the stp mechanism did not block any of the ports?

logs :

<189> Jan 13 17:20:10 SW_AC106-1 TRAPMGR[trapTask]: traputil.c(721) 1115922 %% Instance 0 has elected a new STP root: 0080:4cd9:8fed:axxy
<189> Jan 13 17:20:10 SW_AC106-1 TRAPMGR[trapTask]: traputil.c(721) 1115921 %% Instance 0 has elected a new STP root: 0080:f48e:384a:xxxx
<189> Jan 13 17:20:10 SW_AC106-1 TRAPMGR[trapTask]: traputil.c(721) 1115920 %% Unit 1 elected as the new STP root
<189> Jan 13 17:20:10 SW_AC106-1 TRAPMGR[trapTask]: traputil.c(721) 1115919 %% Po1 is transitioned from the Forwarding state to the Blocking state in instance 0

 

configuration stp :

 

Spanning Tree: Enabled - BPDU Flooding: Disabled - Portfast BPDU Filtering: Disabled
Mode: rstp
CST Regional Root: 80:00:F4:8E:38:4A:BX:XX
Regional Root Path Cost: 0
ROOT ID
Priority 0
Address F48E.384A.AXXX
Path Cost 20000
Root Port Po1
Hello Time: 2s Max Age: 20s Forward Delay: 15s Transmit Hold Count: 6s
Bridge Max Hops: 20
Bridge ID
Priority 32768
Address F48E.384A.B0DF
Hello Time: 2s Max Age: 20s Forward Delay: 15s
Interfaces

Name State Prio.Nbr Cost Sts Role Restricted
--------- -------- --------- --------- ---- ----- ----------
Gi1/0/1 Enabled 128.1 0 DIS Disb No
Gi1/0/2 Enabled 128.2 0 DIS Disb No
Gi1/0/3 Enabled 128.3 0 DIS Disb No
Gi1/0/4 Enabled 128.4 200000 FWD Desg No
Gi1/0/5 Enabled 128.5 0 DIS Disb No
Gi1/0/6 Enabled 128.6 0 DIS Disb No
Gi1/0/7 Enabled 128.7 0 DIS Disb No
Gi1/0/8 Enabled 128.8 0 DIS Disb No
Gi1/0/9 Enabled 128.9 20000 FWD Desg No
Gi1/0/10 Enabled 128.10 0 DIS Disb No
Gi1/0/11 Enabled 128.11 0 DIS Disb No
Gi1/0/12 Enabled 128.12 20000 FWD Desg No
Gi1/0/13 Enabled 128.13 0 DIS Disb No
Gi1/0/14 Enabled 128.14 0 DIS Disb No
Gi1/0/15 Enabled 128.15 0 DIS Disb No
Gi1/0/16 Enabled 128.16 20000 FWD Desg No
Gi1/0/17 Enabled 128.17 0 DIS Disb No
Gi1/0/18 Enabled 128.18 0 DIS Disb No
Gi1/0/19 Enabled 128.19 20000 FWD Desg No
Gi1/0/20 Enabled 128.20 0 DIS Disb No
Gi1/0/21 Enabled 128.21 0 DIS Disb No
Gi1/0/22 Enabled 128.22 0 DIS Disb No
Gi1/0/23 Enabled 128.23 20000 FWD Desg No
Gi1/0/24 Enabled 128.24 0 DIS Disb No
Te1/0/1 Enabled 128.25 0 DIS Disb No
Te1/0/2 Enabled 128.26 0 DIS Disb No
Po1 Enabled 96.650 20000 FWD Root No
Po2 Enabled 96.651 20000 FWD Desg No
Po3 Enabled 96.652 0 DIS Disb No
Po4 Enabled 96.653 0 DIS Disb No
Po5 Enabled 96.654 0 DIS Disb No
Po6 Enabled 96.655 0 DIS Disb No
Po7 Enabled 96.656 0 DIS Disb No
Po8 Enabled 96.657 0 DIS Disb No
Po9 Enabled 96.658 0 DIS Disb No
Po10 Enabled 96.659 0 DIS Disb No
Po11 Enabled 96.660 0 DIS Disb No
Po12 Enabled 96.661 0 DIS Disb No
Po13 Enabled 96.662 0 DIS Disb No
Po14 Enabled 96.663 0 DIS Disb No
Po15 Enabled 96.664 0 DIS Disb No
Po16 Enabled 96.665 0 DIS Disb No
Po17 Enabled 96.666 0 DIS Disb No
Po18 Enabled 96.667 0 DIS Disb No
Po19 Enabled 96.668 0 DIS Disb No
Po20 Enabled 96.669 0 DIS Disb No
Po21 Enabled 96.670 0 DIS Disb No
Po22 Enabled 96.671 0 DIS Disb No
Po23 Enabled 96.672 0 DIS Disb No
Po24 Enabled 96.673 0 DIS Disb No
Po25 Enabled 96.674 0 DIS Disb No
Po26 Enabled 96.675 0 DIS Disb No
Po27 Enabled 96.676 0 DIS Disb No
Po28 Enabled 96.677 0 DIS Disb No
Po29 Enabled 96.678 0 DIS Disb No
Po30 Enabled 96.679 0 DIS Disb No
Po31 Enabled 96.680 0 DIS Disb No
Po32 Enabled 96.681 0 DIS Disb No
Po33 Enabled 96.682 0 DIS Disb No
Po34 Enabled 96.683 0 DIS Disb No
Po35 Enabled 96.684 0 DIS Disb No
Po36 Enabled 96.685 0 DIS Disb No
Po37 Enabled 96.686 0 DIS Disb No
Po38 Enabled 96.687 0 DIS Disb No
Po39 Enabled 96.688 0 DIS Disb No
Po40 Enabled 96.689 0 DIS Disb No
Po41 Enabled 96.690 0 DIS Disb No
Po42 Enabled 96.691 0 DIS Disb No
Po43 Enabled 96.692 0 DIS Disb No
Po44 Enabled 96.693 0 DIS Disb No
Po45 Enabled 96.694 0 DIS Disb No
Po46 Enabled 96.695 0 DIS Disb No
Po47 Enabled 96.696 0 DIS Disb No
Po48 Enabled 96.697 0 DIS Disb No
Po49 Enabled 96.698 0 DIS Disb No
Po50 Enabled 96.699 0 DIS Disb No
Po51 Enabled 96.700 0 DIS Disb No
Po52 Enabled 96.701 0 DIS Disb No
Po53 Enabled 96.702 0 DIS Disb No
Po54 Enabled 96.703 0 DIS Disb No
Po55 Enabled 96.704 0 DIS Disb No
Po56 Enabled 96.705 0 DIS Disb No
Po57 Enabled 96.706 0 DIS Disb No
Po58 Enabled 96.707 0 DIS Disb No
Po59 Enabled 96.708 0 DIS Disb No
Po60 Enabled 96.709 0 DIS Disb No
Po61 Enabled 96.710 0 DIS Disb No
Po62 Enabled 96.711 0 DIS Disb No
Po63 Enabled 96.712 0 DIS Disb No
Po64 Enabled 96.713 0 DIS Disb No
Po65 Enabled 96.714 0 DIS Disb No
Po66 Enabled 96.715 0 DIS Disb No
Po67 Enabled 96.716 0 DIS Disb No
Po68 Enabled 96.717 0 DIS Disb No
Po69 Enabled 96.718 0 DIS Disb No
Po70 Enabled 96.719 0 DIS Disb No
Po71 Enabled 96.720 0 DIS Disb No
Po72 Enabled 96.721 0 DIS Disb No
Po73 Enabled 96.722 0 DIS Disb No
Po74 Enabled 96.723 0 DIS Disb No
Po75 Enabled 96.724 0 DIS Disb No
Po76 Enabled 96.725 0 DIS Disb No
Po77 Enabled 96.726 0 DIS Disb No
Po78 Enabled 96.727 0 DIS Disb No
Po79 Enabled 96.728 0 DIS Disb No
Po80 Enabled 96.729 0 DIS Disb No
Po81 Enabled 96.730 0 DIS Disb No
Po82 Enabled 96.731 0 DIS Disb No
Po83 Enabled 96.732 0 DIS Disb No
Po84 Enabled 96.733 0 DIS Disb No
Po85 Enabled 96.734 0 DIS Disb No
Po86 Enabled 96.735 0 DIS Disb No
Po87 Enabled 96.736 0 DIS Disb No
Po88 Enabled 96.737 0 DIS Disb No
Po89 Enabled 96.738 0 DIS Disb No
Po90 Enabled 96.739 0 DIS Disb No
Po91 Enabled 96.740 0 DIS Disb No
Po92 Enabled 96.741 0 DIS Disb No
Po93 Enabled 96.742 0 DIS Disb No
Po94 Enabled 96.743 0 DIS Disb No
Po95 Enabled 96.744 0 DIS Disb No
Po96 Enabled 96.745 0 DIS Disb No
Po97 Enabled 96.746 0 DIS Disb No
Po98 Enabled 96.747 0 DIS Disb No
Po99 Enabled 96.748 0 DIS Disb No
Po100 Enabled 96.749 0 DIS Disb No
Po101 Enabled 96.750 0 DIS Disb No
Po102 Enabled 96.751 0 DIS Disb No
Po103 Enabled 96.752 0 DIS Disb No
Po104 Enabled 96.753 0 DIS Disb No
Po105 Enabled 96.754 0 DIS Disb No
Po106 Enabled 96.755 0 DIS Disb No
Po107 Enabled 96.756 0 DIS Disb No
Po108 Enabled 96.757 0 DIS Disb No
Po109 Enabled 96.758 0 DIS Disb No
Po110 Enabled 96.759 0 DIS Disb No
Po111 Enabled 96.760 0 DIS Disb No
Po112 Enabled 96.761 0 DIS Disb No
Po113 Enabled 96.762 0 DIS Disb No
Po114 Enabled 96.763 0 DIS Disb No
Po115 Enabled 96.764 0 DIS Disb No
Po116 Enabled 96.765 0 DIS Disb No
Po117 Enabled 96.766 0 DIS Disb No
Po118 Enabled 96.767 0 DIS Disb No
Po119 Enabled 96.768 0 DIS Disb No
Po120 Enabled 96.769 0 DIS Disb No
Po121 Enabled 96.770 0 DIS Disb No
Po122 Enabled 96.771 0 DIS Disb No
Po123 Enabled 96.772 0 DIS Disb No
Po124 Enabled 96.773 0 DIS Disb No
Po125 Enabled 96.774 0 DIS Disb No
Po126 Enabled 96.775 0 DIS Disb No
Po127 Enabled 96.776 0 DIS Disb No
Po128 Enabled 96.777 0 DIS Disb No

 

Do I have to select any specific options, e.g. bpdu protection?

 

I would not like to run port fast.

And how do you configure your feet on uplink? whether to run the loop protection option?