On 22-mrt-2007, at 13:12, Russ White wrote:
I think I've heard it said someplace that only about 1/4 of the
typical
ISP's table is Internet routes, while the remainder are internally
injected or 2547bis, etc. Perhaps someone can confirm or deny this?
It has been a while since I've worked at a really large ISP, but yes,
the internal routing can be significant. However, there is no clear
requirement that you carry all internal stuff everywhere, so the size
of this stuff is (or: should be) more managable than the DFZ stuff.
Based on Vince's presentation, about 50% of the "internet" routing
table
is actually also injected for traffic engineer. Hence, we get to the
point where an overwhelming proportion of any given routing table is
there to engineer traffic flow, rather than to provide reachability.
Increase in the routing table was 16 or 17 % last year, but the
number of prefixes given out by the RIRs increased from 72661 to
78154 or a 7.5% increase.
In the RRG meeting saturday it was said that 10M total routes in 2021
is doable, which makes for a factor 25 or so increase in 14 years or
24% per year. I guess we don't have a problem after all, and we
certainly don't if we can get rid of this TE or "I'm too dumb to
aggregate" stuff.
Until everyone and their little sister requests IPv6 PI space and
starts multihoming in IPv6, of course.
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