Re: IP and Optical domains?

[Masataka Ohta <mohta () necom830 hpcl titech ac jp>]

Mark Tinka wrote:

> I'd like to hear your proposals on how Layer 3 protocols can be better
> designed to manage transport characteristics.

By not managing transport characteristics at all except
that links are on or off (or, if you want to guarantee QoS,
a little more than that).

L3 protocols know links are off if L2 operators actively
turn them off or if the protocols detect consecutive lack
of L3 HELO generated frequently enough.

L2 operators turns links off for maintenance and
BER degradations need unscheduled maintenance.

> > That's L1, which is also required to exist.
>
> It's Layer 1 and Layer 2. Ethernet is running over those optics, albeit
> with no "traditional" optical equipment in between.

So, no disagreement, here.

> > So, you deny the original point of "The result of this is that the
> > networks are heavily underutilized". OK.

> We upgrade at 50% utilization. Others do it at 70% utilization. Others
> do it at 100% utilization. Heck, I know some that do it at 40% utilization.

I'm afraid "heavily" implies a lot less utilization.

                                                Masataka Ohta