its not something I want to have. But there are some unmanaged switches around connected to backbone switch and they do not support STP. I supposed it might be a good idea to execute 'storm control' command until we replace those dummy switches with catalyst rstp supported ones.
I'm not sure if this is really what you meant, but if you want to configure your network with a physical loop and disable spanning tree, storm control is not going to help. Your network will just be unusable.
If you have a sustained loop in your network, any packet will potentially use all the bandwidth available on this loop. Not only broadcasts, multicasts but also unknown unicasts. Your storm control will need to be configured for any type of traffic and will continuously kick in.
You'd rather have no redundancy in your network then.
Also, if you expected storm control to have any kind of effect in your topology, it means that you have at least one bridge supporting this feature on your physical loop. If this bridge support storm control, it probably also support some version of STP;-) It will then be able to run STP through the dumb switches and prevent the loop (if the switches are dumb, I hope they are dumb enough to let BPDUs go through). It's not an ideal solution, there are some drawbacks, but it's definitely more viable than a permanent loop in the network.
This document gives several answers on frequently asked questions for PFRv3 channel state behavior.
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