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Re: Review of draft-ietf-6man-rfc4291bis-06

2017-01-15 09:55:11
On Sat, Jan 14, 2017 at 5:03 AM, heasley <heas(_at_)shrubbery(_dot_)net> wrote:

But it's true that supporting /65-/126 increases the cost of the device.
The extra bits have to go somewhere. I think I've seen hardware that just
converted all prefixes to 128 bit if there was at least one /65 - /126
prefix in the FIB. That costs money for RAM. Obviously that's silly if
those prefixes are frequent, and you can save that money using better
software engineering - but software engineering costs money too.

do such limited devices really need complex ribs/fibs?  address, router,
neighbors.  all of which are needed regardless of the prefix length.


The "/65 - /126 challenged" devices I'm talking about were very big iron
routers.


Prefixes don't cost money,

but, they do: https://www.arin.net/fees/fee_schedule.html


No, they don't. The link you provide says you get a /32 for $1000, which
puts the cost of a /64 at $1000 / 2^32 or $0.0000002.