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IGMP TCN Flood
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Hi,
How do these switches handle topology changes with STP? Do they flood traffic for a period of time like other switches. If so do they have a command similar to that of ciscos "no igmp snooping tcn flood"
Can't find any information on this so any insight would be appreciated. We've recently had a broadcast storm and are reviewing our topology.
Thank you,
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Hi @kaboomcanuck2 ,
TCN get flooded by default. I would recommend you manipulate the Bridge Priority at the very least at your core, with a lower value (for instance, 0) in order to get elected as the root - when all other M4250 switches keep their 32K default value. We allow for it in the AV user interface, welcome page, with the Main/Backup STP entry.
To answer your question, please find the M4250 CLI admin manual here: https://www.netgear.com/support/product/m4250#docs
You can use the spanning-tree tcnguard command at the interface level to restrict topology change notification propagation:
>Enable
#Config
#interface 0/1-0/48
#spanning-tree tcnguard
#exit
#exit
#save
spanning-tree tcnguard Use this command to enable TCN guard on the interface. When enabled, TCN Guard restricts the interface from propagating any topology change information received through that interface.
no spanning-tree tcnguard This command resets the TCN guard status of the port to the default value.
no spanning-tree tcnguard |
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Hi @kaboomcanuck2 ,
TCN get flooded by default. I would recommend you manipulate the Bridge Priority at the very least at your core, with a lower value (for instance, 0) in order to get elected as the root - when all other M4250 switches keep their 32K default value. We allow for it in the AV user interface, welcome page, with the Main/Backup STP entry.
To answer your question, please find the M4250 CLI admin manual here: https://www.netgear.com/support/product/m4250#docs
You can use the spanning-tree tcnguard command at the interface level to restrict topology change notification propagation:
>Enable
#Config
#interface 0/1-0/48
#spanning-tree tcnguard
#exit
#exit
#save
spanning-tree tcnguard Use this command to enable TCN guard on the interface. When enabled, TCN Guard restricts the interface from propagating any topology change information received through that interface.
no spanning-tree tcnguard This command resets the TCN guard status of the port to the default value.
no spanning-tree tcnguard |
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Re: IGMP TCN Flood
Thank you - we will do this for all our edge ports. We do have our main switch \ IGMP querier set as the root bridge.
Just want to add that you do a great job Laurent!
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