via Cisco IOS hints and tricks: Load sharing 101 with references.
I kinda miss this stuff.
I remember having a 2xT1 setup where my end was a 2500 that couldn’t handle per-packet w/o adding so much jitter the videoconfrence got destroyed. The solution, since the video stream was only 768k, was to “temporarily” turn off the second T1. Pretty sure that second T1 stayed off and payed for for years after that.