At 9:35 AM +0100 3/21/07, Iljitsch van Beijnum wrote:
I was looking through draft-ietf-sidr-arch-00.txt and I noticed this:
5.2.2. Multi-homing
If a multi-homed subscriber wants multiple ASes to originate routes
for prefixes that it holds, then it must explicitly authorize each of
them to do so by issuing a ROA for each AS in question.
Does this address the solution where multihomer M uses ISPs A and B,
and M's prefix is injected into BGP by both A and B and NOT by M?
I.e., "inconsistent origin AS", which is frowned upon.
This text is saying that generation of multiple ROAs by M will allow
A and B to both advertise M's prefix in a verifiable fashion, which
should make this case less "frowned upon" :-).
If not, the text is unclear. If so, why is there no discussion of
the normal situation where the multihomed AS advertises its prefix
itself?
If M originates the routes, i.e., M's AS number is the origin AS in
advertisements, then only one ROA is needed, and it was not
classified as "multi-homed" in the document. We will add text to make
this distinction clear.
Same thing for portable allocations without multihoming, although
there the situation where the ISP originates the prefix is more
common.
OK.
Steve
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