In einer eMail vom 06.01.2009 20:37:35 Westeuropäische Normalzeit schreibt
[email protected]:
True, but deploying a new architecture will have a one-time cost impact.
Paid for, over and done. It will be spread out over each system that needs
to be upgraded, but it is a fixed and finite cost.
Paying for a more expensive control plane is likely to be an ongoing, ever
increasing cost.
| Would the industry be willing to buy into the *promise* of
| "a paradise" in the *long* term at the price of fairly certain
| cost increases in the *short/medium* term ?
|
| All of the above means that a "promise" of cost reduction in the
| *long* term may not be sufficient - the new routing architecture
| needs to deliver in the *short/medium* term sufficient *tangible*
| benefits to justify its *short/medium* term cost.
One might look it at it instead as avoiding the guarantee of long term
higher costs.
In any case, there are numerous problems that we do feel we need to overcome
with the new architecture. Whether the deployment costs are sufficiently
justified will in part depend on what we produce, and we will not know that
until we have consensus on a workable architecture.
| - One may argue that the real problem is not in the cost increases,
| but in the way how these increases are absorbed by the system.
| Namely, the real problem is that those who do not benefit
| are still required to pay for covering the cost imposed by those
| who do benefit. That applies both to the current system, as well
| as to any proposal for a new routing architecture.
Changing the topology agnostic BGP to a well-reduced topology aware BGP,
where there is no update churn anymore, where a router may have to deal with
a
small number of nodes and strict/loose links only, where the next hop is
determined by either one or three lookups so that it doesn't need caching
capability either,
will reduce the monetary costs immensely.
Yakov also mentioned the huge number of mobile IP users to be expected in
the future.
Wrt to mobility it would be crazy to continue with LISP 's LOC -routing, i.e
to NOT switch over to location routing. We may aso be going to see
applications where users are only mobile, i.e. have no home place at any time.
Heiner
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