🚀 go-pugleaf

> Will IGRP handle the addition and deletion of the T1 line gracefully?  (Will
> the 56k line be used at all when the T1 line is active?)  ((To digress for
> a moment, if the T1 line has a significantly different propagation delay
> than does the 56k line, odd things can happen, e.g., large reassembly
> queues.))

When the T1 line comes up, the additional bandwidth of the 56kb line
becomes a small enough drop in the bucket that its hardly worth using
and will most likely degrade your performance due to the higher delay.
By default, IGRP will route all of the traffic over the T1 link, but
the "variance" configuration command can be used to override this in a
probably unsuccessful attempt to load balance between the two lines.
Load balancing does in fact work very effectively for two lines with
similar bandwidths.

Rob