[c-nsp] PPP Multilink

[Per Carlson]

On Thu Dec  1 11:54:34 2005 -0800, noc ops wrote:
> > The point here is, 
> > CEF LB works great if you have multiple links, even with voice.
> ------
> interesting, we've had horrible performance due to packet-out-of-order
> on our 2xt1s (2621) w/ cef per-packet enabled.

it has been said multiple times before, per-packet load balancing
causes more pain than it resolves. if the tdm-lines doesn't share
the exact same route in the sdh/pdh-network the packets will have
slightly different latency, and out-of-order packets *will* occur.

flow-based load balancing works much better. ok, you don't get
100% equal load distribution, and you can't fill the aggregate
line with one flow, but's that's easy tradeofs in my opinion.

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