Thanks Chris, but that doesn't really help me - the problem is our carrier provides circuits with a certain CIR - any traffic over that CIR can be discarded. The only way to prevent this is to mark traffic we need with 802.1p to make it discard ineligible - and to make use of 802.1p we need 802.1Q headers on the WAN side
That's pretty much our only option - however it's not 100% foolproof as our circuit speeds are much greater than the CIR - ie. for a 100 Mbit circuit we would get something like 2.5 Mbit/s CIR.
Also the queuing strategy is random drop, so as soon as there's traffic over 2.5 Mbit/s it may start dropping packets randomly (terrible for voice, as you can imagine) - so unless we cripple the 100M circuit by rate limiting to 2.5M, L3 QoS is not particularly useful.
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