Re: host-centric draft

[Kurt Erik Lindqvist <kurtis@kurtis.pp.se>]

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On 2004-02-25, at 18.06, Erik Nordmark wrote:

>> So the question is: can we detect the actual reachability using probes
>> fast enough that we don't feel we also need to look in the routing
>> tables? If end-to-end is 30 seconds while routing table is 30
>> microseconds, then sure, I agree that the latter is useful. If
>> end-to-end is 3 seconds, maybe having to wait this long some of the
>> time is better than importing all this BGP complexity. If it's 300
>> milliseconds I'm sure it is.
>
> That's on the benefit side, but also have too look at the cost side
> in terms of scaling.
> If all hosts perform e2e probing of all the local/peer locator pairs
> this might add up to a lot of packets; might be more than the amount of
> data packets that are exchanged in some cases (imagine hosts being 
> sensors
> which only send a data packet every 30 seconds and now you add probing 
> 4 or
> so local/peer locator pairs!).
>
> If we care about *site* (and not *host*) multihoming one could try to
> have hosts share the information they learn from probing with their
> neighboring hosts. But that leads more or less to reinventing
> a routing protocol.

Or piggybacking on one of the existing ones?

Best regards,

- - kurtis -

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