On LAN QoS, I've seen a configuration like below:

g0/1/0
>  srr-queue bandwidth share 1 30 40 30
>  srr-queue bandwidth shape 4 0 0 0
>  priority-queue out
>

>From my understanding, "priority-queue out" will make Q1 the priority queue,
which means, until Q1 is empty, there won't be any transmission on Q2, Q3
and Q4.

If that's the case, what's the point of shaping Q1's bandwidth with
"bandwidth shape 4 0 0 0"?  Shouldn't we give Q1 100% bandwidth (since it's
priority queue)?

Thanks!
Michael
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