Since there is no problem that cannot be solved by an additional layer of abstraction, I propose a Universal Title Translation that would overlay the Global Title Translation. I leave it to some physics wonk to pencil up a Multiverse Title Translation... David On Mon, Aug 24, 2009 at 7:02 AM, Alex Balashov<abalashov at evaristesys.com> wrote:
Another thing to consider is that in the BGP world, the IP block(s) announced by the customer are actually "owned" by the customer, in an administrative and a technical sense. ?This is true whether they are subnets of a provider's aggregate, or provider-independent blocks obtained directly by the customer through a RIR like ARIN.
The ISPs really do just provide the transit. ?You can announce whatever blocks you want to them (that they let you/don't filter), and they can announce those blocks on behalf of their subtended networks (customers).
PSTN numbers don't work that way, conceptually. ? You may, as a customer, "own" the numbers in some legally significant way, but as implemented in the underlying technology, they are homed (or ported) to a carrier switch. That's just where they go, and that's what makes them functional.
When it comes to multi-provider redundancy, I think the eventual solution - if there's any interest and business case for one - will be less to hair-trigger NPAC subscriptions to another OCN/LRN, protection switch-style, and more the use of some sort of "logical" number or identifier that is a wrapper for the underlying numbers that are still statically assigned to a particular carrier. ?Sort of like a hunt group or find-me-follow-me functionality, but on a lower level of abstraction. ?:)
-- Alex
-- Alex Balashov - Principal Evariste Systems Web ? ? : http://www.evaristesys.com/ Tel ? ? : (+1) (678) 954-0670 Direct ?: (+1) (678) 954-0671