On Jul 12, 2009, [email protected] wrote:
Let's put it differently: Incremental deployability requires still BGP
to overcome the main function of BGP which is the non-scalable way to
disseminate all these hundred thousands of prefixes. The methods are
not
new: Remember BGP-based dissemination of MPLS-VPN sites (just lacking
the goal to build ONE SINGLE "internet-VPN") : here the information
are
labels, i.e. not IP addresses. Also remember LISP's default mapper.
Issueing a prefix of length 0 might attract traffic destined for a
node
which doesn't propagate its traditional reachability prefixes anymore
but just new routing info for a new architecture, analogously to the
MPLS-labels.
Heiner -
I agree with the argument that IP addresses could theoretically be
replaced in their role of locators. Although I would add that the
feasibility of this heavily depends on the deployment model:
LISP proxies are not a good example because they require IP addresses
as locators to route packets towards a proxy. On the other hand, APT's
deployment model -- which calls for initial local deployment and
subsequent expansion -- could facilitate the introduction of new
locators. Of course, those new locators would have to be suitable for
use across administratively discontinuous providers, like IP addresses.
- Christian
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