Re: IP and Optical domains?

Mark Tinka wrote:

Layer 2 transport is required in any scenario.

Yes, of course, as I wrote:

all the thing to be done at L2 is to watch BER/FER above some threshold.

I don't deny L2 exist, though, if L3 protocols were properly designed, L2 protection is not required.

Dark fibre, for example, would not have any optical kit on it, and can be fired through router-to-router optics.

That's L1, which is also required to exist.

We primarily over-provision to support growth. Resiliency comes as secondary benefit.

If you are deploying additional bandwidth just for protection, I hope you're my competitor.

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