Re: [Ila] [5gangip] Scaling mapping systems (was Re: BOF Description)

[Tom Herbert <[e-mail]>]

On Sat, Feb 3, 2018 at 3:26 PM, Dino Farinacci <[e-mail]> wrote:
> On Fri, Feb 2, 2018 at 10:37 AM, Dino Farinacci <[e-mail]> wrote:
>>>
>>> The question to be answered is if all 10 million need to be stored in one place at the same time.
>>>
>>> Lorenzo, do you think the DNS is scaling? And if the mapping system is designed roughly the same way, could it scale?
>>>
>> Right, there now are many examples of sharded databases to draw
>> lessons from. At 10M entries per router, to get to 1B aggregate
>> mappings in a network that's 100 routers. Assuming a 5x replication
>> factor then network needs 500 identifier/locator routers. I would
>> target scaling this by two orders of magnitude within ten years to
>> accommodate influx of IoT devices and fined grained object addressing
>> in virtualization. I know this is simplistic math and scaling this is
>> a hard problem, but I believe it's a solvable problem.
>
> I think so too and has been an effort of mine for many years. And something I requested and wanted IDEAs to tackle.
>
>>
>>> Also, the other point you made about third-party dependency, is a another question about push versus pull style of operation.
>>>
>>
>> There is a related question that needs to be addressed and that's
>> DOSability of a mapping cache.
>>
>> For instance, from RFC6380:
>
> You mean RFC6830. And what you are commenting on below is the map-cache and not the global mapping system. That is the point I want to get Lorenzo’s opinion about.
>
Dino,

One question about the packet flow sequence in section 4.1 of RFC6830.
On a cache miss, what does an ITR do with the packet? Is it dropped,
queued for pending resolution, forwarded to a node that would have the
mapping, or other?

Thanks,
Tom