No, don't see the need for shaping. Shaping would preclude backup from using bandwidth that's otherwise not being used. If we only guarantee backup 1% it leaves all other traffic 99%. (Actually with FQ in class-default, it's more complex but doubt if we need to get into why.)
If you want, you could guarantee other traffic absolute priority over backup traffic but that's a good way to completely break backup flows if you totally starve them of bandwidth.
"So actually what I try to achieve is not to give priority to backup but rather find a simple way to limit it when other types of traffic are present."
Yes, correct. What I suggested deprioritzes backup traffic relative to other traffic.
"So my question about initial config - if backup traffic will exceed 1% and wan link will be full say with Exchange - who will drop backup or how fighting for bandwidth will be looking like?"
If backup exceeds 1% it's because the bandwidth wasn't otherwise being used. For example, Exchange could use 10% leaving backup 90% or Exchange could use 70% leaving backup 30%. If both backup wanted all 100% and Exchange wanted all 100%, backup would only get 1% and Exchange 99%.
Did you try such QoS implementation? It is interesting as I did tests and it is not working at all. Then I did some more research and found that QoS input should be applied to Eth interface using dscp.
So simple task requires so many time to spend doing reseach.
Cisco has documentation about CBWFQ, but it doesnt work in reality
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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