On Fri, Oct 11, 2013 at 8:18 PM, Michael Richardson <[email protected]>wrote:
> > Eggert, Lars <[email protected]> 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. > Most Ethernet switches that I'm aware of do already implement WRED. Can't speak for other devices (DSL, etc.) since I don't have experience with those. > > 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. > You probably mean 802.1ag. > > I'm unclear if this is a feature of that equipment, or a part of the > standard. I don't believe bandwidth measurement is part of the standard, but certainly one can choose to use these protocols to measure the bandwidth. However, it's an expensive process. However, bandwidth will variable if the L2 network is shared by multiple L3 devices, and this means the measurements would have to be made continuously, making it counter-productive. Unless, some mechanism is used to pre-provision bandwidth between L3 peers. Anoop
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