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IGMP TCN Flood
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 snoopin...
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.
Default
Enabled
Mode
Interface Config
spanning-tree tcnguardno spanning-tree tcnguard
This command resets the TCN guard status of the port to the default value.
Mode
Interface Config
no spanning-tree tcnguard
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!
Thank you, kaboomcanuck2 🙂
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