Enhanced Storm Control

[RWelch-USA]

What are considered "best practice" thresholds for each (Broadcast, Multicast, Unknown unicast)?

Any ports that one would not want to ENABLE storm control on or for (i.e, specific device/endpoint)?

[Karsten Iwen]

For all user-ports, I typically use 1%. Everything above that (or even with 1%) is a clear failure condition as that should not happen normally.

[RWelch-USA]

@Karsten Iwen thank you for your feedback, it's appreciated. Hoping others reply as to how their limits are set for comparison - similar to your 1% or if different (and maybe why).. Thank you again.

[CMR]

Don't enable it (or set the threshold much higher) for IP content sources. These cold be HDMI to Video over IP encoders or CCTV NVRs/DVRs as both often use multicast in particular to send their streams. Audio sources could also be in the same category.

[Karsten Iwen]

Mine were only for pure end devices that consume services but don't provide services. Yes, a video server needs other settings.

[Philip D'Ath]

I have had more outages caused by using storm control than prevented. Consequently I don't use this feature generally unless I am trying to address a specific issue.

[Karsten Iwen]

What kind of problems did you face?

[Philip D'Ath]

The most frequent problem I have had to investigate is clients reporting random occasions when devices can not talk to each other, and then it self-resolving. Typically it was ARP traffic getting dropped.

I have had issues in the past with HSRP intermittently destablising. Couldn't exchange their multicast hello packets.

Such nasty problems to track down.

[RWelch-USA]

@Karsten Iwen @CMR @Philip D'Ath - thank you for your feedback. I have never enabled any Storm Control features or settings from the Switch Settings page but when selecting "Try New Version" at the top RH corner, there is now info listed under Storm control section of the UI. When I revert back to the "View Old Version" it lists nothing. I have not enabled it so it isn't impacting anything but the new page makes one think it's been configured. I am not so fond of the new UI page so I plan to stick with the View Old Version.

 

 

 

 

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