Re: [RRG] NTP and various proposals.

[Tony Li <tli@cisco.com>]

On Feb 28, 2008, at 12:38 PM, William Herrin wrote:

> On Thu, Feb 28, 2008 at 2:52 PM, Tony Li <tli@cisco.com> wrote:
> >  Your assumption here is that all cache entries need to have equal
> >  validity.  This is not necessary; it's trivial for the cache  
> > entry to
> >  have an associated TTL that tells the ITR exactly how long to retain
> >  the cache entry.
>
> Hi Tony,
>
> That could hardly be my assumption. My horse in this race, TRRP, has
> widely variable TTLs for the map cache precisely because I recognize
> that one size doesn't fit all.
>
> I do have a couple assumptions though:
>
> * that NTP is a two-way protocol which requires a stable -round trip-.
>
> * that it is desirable for mobile clients to be able to synchronize
> their clocks with NTP servers as well, thus the server-side ITR (if
> there is one) needs to be able to deal with the client's possibly
> frequent ETR changes even if the client's ITR can reasonably expect
> the server to stay in the same place.


If your server side ITR can only learn from mapping changes and your  
mapping function can't keep up with the mobile host, then I'd say  
that your horse isn't cutting the mustard.

Tony


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