So basically we are planning to add some Guests to network and we want to protect MPLS uplinks to be congested by Guest traffic (BYOD, IoT, Guest SSIDs).
So basically we have 3 SSIDs which can't consume more then certain % of the MPLS uplink.
Lets imagine that certain % of MPLS uplink is 40 Mbits. So in one hand all those 3 SSIDs can't consume more then 40 Mbits of uplink but in the same time, if I have just one user connected to BYOD SSID and no user on IoT and Guest then I do not want let this one user consume all 40 Mbits, I want to give him just 8 Mbits of download and 1 Mbits of upload.
So if I have 5 users connected they still have 8 Mbits download each and per site it will be still 40 Mbits.
But if I have 10 users connected we can't give them together 80 Mbits of download, so that is a reason to have in the same time rate limiting to keep all those three SSIDs together below 40 Mbits.
THX