Hi Geoff,
>Dunno how much all this helps the world other than illustrate (a)
that
>AS-based routing is probably too coarse and you may want a finer
level
>of granularity in terms of division of forwarding elements and
(b) all
>of this is well covered ground.
I think AS-based routing does not necessarily
imply that
we have to use just a
locator per AS, but the locators'
structure will have to be based on the AS
number.
(I will use 2-byte AS numbers to better explain
this).
Let's suppose we want to send traffic to a server A having
an IP address within the "identifier prefix" of a
stub AS
connected to a transit provider whose ASN=1. Let's also
send tunneled traffic towards AS1 (second
and third bytes
are the AS number). It means that the outer IP address
For server B having an IP address in a different
"identifier
prefix", AS1
could announce a second "locator prefix", for
would be tunneled with the outer IP address 240.0.1.128.
And AS1 would announce these two "locator
prefixes", namely
rest of the Internet.
And this exercise can be made finer and finer so
that an
"identifier prefix" could be assigned a "locator
prefix"
Therefore AS-based routing can be used with a
very fine
level of
granularity I think.
Regards,
Juanjo
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