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[ih] Why did congestion happen at all? Re: why did CC happen at all?

    > From: Tony Li <tony.li at tony.li>

    > the last poor soul who did enable all of the dynamic features of
    > (E)IGRP ended up with a vio lently unstable network.

The so-called 'new ARPANET routing algorithm' was done in part because
the original load-dependent DV routing algorithm was not very stable.
See BBN Report 3803 for more.

    > From: Brian E Carpenter <brian.e.carpenter at gmail.com>

    > if you shift load as a result of the latter, you shift the congestion,
    > and the result is oscillation between one congested path and another.

Yes, they ran into this problem with the new routing algorithm too; it had
to be damped to prevent oscillations. See:

  Atul Khanna, John Zinky, "The Revised ARPANET Routing Metric"