Eggert, Lars <l...@netapp.com> wrote:
> I've heard that statement [that RED is supported] from many different
> people. I wonder if it is
> actually true. Is there any hard data on this?The issue I've had is that while RED is supported on a routing device, and I can enable it on a per-VLAN basis, that does me little good, because there are bottlenecks in layer-2 devices (ethernet, but also DSL,GPON, etc.) which are out of my control. What I would like is a standard layer-3 way to measure bandwidth across my layer-3 hop, and autoconfigure RED (or CoDel) to the measured bandwidth. My understanding is that some equipment can use 802.1ad CCP and/or Loopback frames to measure bandwidth across bridged layer-2 ethernet networks. I'm unclear if this is a feature of that equipment, or a part of the standard. My understanding is that the math involved is pretty straightforward, but getting it right in code can involve dealing with a number of numerical issues which makes it slightly non-trivial to implement. (And you need good low-latency time stamping of packets) -- Michael Richardson <mcr+i...@sandelman.ca>, Sandelman Software Works
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