mae-west congestion

Date: Thu, 21 Mar 1996 13:48:40 -0800 (PST)
From: (Matthew Kaufman)

If you take a look at
you find that the Ames FDDI ring is totally saturated. Now, that means that
anyone who's trading traffic over on that side, or between Ames and San Jose,
is getting really really lousy performance.

What I don't understand is why that has _stayed_ saturated... it seems to me
that some of the big players would have rerouted their traffic by now to avoid
subjecting it to this, which would also have the side effect of causing the
problem to, at least for the short term, go away.

We, too, have notices the problem, although we mostly see it in
packets bound for the MFD ring. Pings to other Ames peers seem to do

This started abruptly on about March 7th and has been consistently bad
since then. That is about the time BBN Planet started routing
everything there via AS1, but I have no idea of this is a significant
part of the problem. FWIW, MFS blames the load on the GIGAswitch,
although I don't see this indicated in the plots. They didn't give us
any estimate for improving the situation.

R. Kevin Oberman
Energy Sciences Network (ESnet)
National Energy Research Supercomputer Center (NERSC)
EMAIL: Phone: +1 510 422-6955