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Blocking all the uplink ports on our Managed Switches once detected a loop.

Blocking all the uplink ports on our Managed Switches once detected a loop.

Blocking all the uplink ports on our Managed Switches once detected a loop.
Blocking all the uplink ports on our Managed Switches once detected a loop.
2025-07-17 08:56:21 - last edited 2025-07-18 08:58:48
Tags: #Controller #STP/RSTP
Model: TL-SX3016F  
Hardware Version: V1
Firmware Version: 1.20.5 Build 20250121 Rel.52254

Dear all,

 

we have more than 50 switches consists of SX3016F, SX3008F, SG3428X, SG3210XHP-M2. When a loop occurred in one place, it blocks all the uplink ports on all the switches. we are using Omada Software Controller (5.15.8.2) on an IBM Server.

 

We have tried all the settings in  Loopback Control like STP, RSTP, Port based settings, it is very difficult find the exact loop where it occurred.

Please help me find a solution.

 

Thanks in Advance.

 

Srinivas

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#1
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1 Accepted Solution
Re:Blocking all the uplink ports on our Managed Switches once detected a loop.-Solution
2025-07-18 08:58:43 - last edited 2025-07-18 08:58:48

  @srksrinivas 

srksrinivas wrote

  @Clive_A 

Yes, it is an educational institution. some times students or teachers mistakenly connect both ends of the ethernet patch cable in the outlets and causing loop. it is very difficult to identify point out location to remove the loop. we have to check each and every location manually.

Not always, but when it happens, entire network having problem of restarting every uplink port.

Best practice to prevent network loops with Omada SDN solution

Recommended Solution
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#6
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Re:Blocking all the uplink ports on our Managed Switches once detected a loop.
2025-07-18 00:37:38

  @srksrinivas 

Is there any change to the physical link?

Do you notice any wire connection follows a loop detection?

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#2
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Re:Blocking all the uplink ports on our Managed Switches once detected a loop.
2025-07-18 07:20:17

  @srksrinivas 

 

You should be able to use rSTP to help you find the port that the loop originates from

 

Not only do you enable rSTP in the switch config area, but you also need to enable it in the port profiles as well, otherwise it doesnt take effect

 

 

Once rSTP is properly set on the switches and port profiles, it should identify at least one of the ports in the loop

Main: ER8411 x1, SG3428X x1, SG3452 x1, SG2428LP x1, SG3210 x1, SG2218P x1, SG2008P x3, ES208G x1, EAP650 x6 Remote: ER7206 v2 x1, ER605 v2 x3, SG2008P x2, EAP650 x2, ES205G x1 Controller: OC300
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#3
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Re:Blocking all the uplink ports on our Managed Switches once detected a loop.
2025-07-18 07:23:19

  @Clive_A 

Yes, it is an educational institution. some times students or teachers mistakenly connect both ends of the ethernet patch cable in the outlets and causing loop. it is very difficult to identify point out location to remove the loop. we have to check each and every location manually.

Not always, but when it happens, entire network having problem of restarting every uplink port.

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#4
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Re:Blocking all the uplink ports on our Managed Switches once detected a loop.
2025-07-18 07:24:36

  @GRL 

Thanks I will try and update.

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#5
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Re:Blocking all the uplink ports on our Managed Switches once detected a loop.-Solution
2025-07-18 08:58:43 - last edited 2025-07-18 08:58:48

  @srksrinivas 

srksrinivas wrote

  @Clive_A 

Yes, it is an educational institution. some times students or teachers mistakenly connect both ends of the ethernet patch cable in the outlets and causing loop. it is very difficult to identify point out location to remove the loop. we have to check each and every location manually.

Not always, but when it happens, entire network having problem of restarting every uplink port.

Best practice to prevent network loops with Omada SDN solution

Recommended Solution
  1  
  1  
#6
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