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Glen, I have our Cisco SE working to find that answer, and more. (The more is QoS per port changes on an active port, and other QoS impact on other Cisco devices.)
So far, information I've received is there shouldn't be any major interruption, but that's not definitive yet. Additionally, there might be some minor interruption (i.e. a few packets "in flight").
If I get any more info, I'll try to remember to post it here.
