AW: [e2e] Queue size of routers

Michael Welzl michael.welzl at
Fri Jan 17 11:55:07 PST 2003

> -----Ursprungliche Nachricht-----
> Von: end2end-interest-admin at
> [mailto:end2end-interest-admin at]Im Auftrag von Greg Minshall
> Gesendet: Freitag, 17. Janner 2003 18:38
> An: Vadim Antonov
> Cc: end2end-interest at
> Betreff: Re: [e2e] Queue size of routers 
> > Routers in real backbones have the delay*bw of buffer space.
> good!


I'm serious - I know that a delay*bw queue length is just
right if, for example, you suddenly fill the capacity of a
dumbbell bottleneck in a simulation with new flows and
don't want some of the initial packets to be dropped,
thereby eliminating a potential traffic phase effect. But
is that a good choice for a backbone router?
The LA<->Tokyo RTT is quite a bit of delay ... is that
really reasonable when only a small number of flows may
show this RTT? Shouldn't backbone routers be more concerned
with traffic aggregates instead?

And: is there RED in backbone routers?


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