Our SLA commitments are conditional on the average WAN utilisation remaining below 70%. If the utilisation exceeds 70% we recommend a bandwidth upgrade or a change in the QoS policy.
This figure is now being questioned and I need to identify the rationale for this value. I recall reading somewhere that WAN links should be upgraded if the utilisation exceeds 70% but can't find the reference in any of my Cisco books.
Can someone help me reference the text or did I just imagine it!