[address-policy-wg] Just say *NO* to PI space -- or how to make it lessdestructive

Gert Doering wrote:

> Hi,

Hi,

>>Moreover, considering bandwidth requirement for the next 5 or
>>10 years, I don't think backbone routers can have huge routing
>>tables.

> Looking at the architecture of modern routing gear I fail to understand
> how "forwarding plane speed" relates to "control plane convergence time".

I'm not saying such a thing. 

I'm saying that, given a so short duration for routing table lookup,
we must make memory for routing table smaller and simpler. Note that,
at 1Tbps, 500B packet is 4ns long, at 10Tbps 0.4ns.

If you try to solve the problem by parallelizm, you must provide
tens or hundreds copies of routing table hardware, which consumes
a lot of money and power.

That is, there are at least two reasons, one is convergence time and
the other is look up time, to make backbone routing table small.

						Masataka Ohta