"Tactical" /24 announcements

Masataka Ohta mohta at necom830.hpcl.titech.ac.jp
Tue Aug 10 09:29:06 UTC 2021

Sabri Berisha wrote:

> Just for fun, I did the math. A total of 16,777,216 /24s fit in 32
> bits. Take away all the reserved space as per IANA (this is 1,266,696
> /24s, see below),

 >	1048576

I think we should also take away multicast addresses of

 >	1048576

because multicast route can not be aggregated and must
be treated as /32.


> The largest FIB table I have seen (hi Jim!) was 3,563,546 routes in
> hardware. This was in a lab environment, of course.

for /24, these days, having 16M entry SRAM (simple one, not
TCAM) is trivially easy.

							Masataka Ohta

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