Re: [RRG] NTP and various proposals.

[Tony Li <tli@cisco.com>]

On Feb 25, 2008, at 9:48 PM, William Herrin wrote:

> Plug it in to your favorite map-encap scheme


That would be the null set.  ;-)

However, to be fair, the issue that you have is with ALL mapping  
schemes, not just map-n-encap.  Everything that relies on a cache is  
going to have a working set and size issues.

> and and factor for the
> need to keep the cache entry current and accurate during that 18
> minute span of inactivity. Now ask the right question: not is it
> possible in general but is it possible for that inactive cache
> increase to be cost-effective?


Entirely possible.  The real question is how much state needs to be  
stored.  That depends on the scope of the mapping resolution box.   
Having a DNS server with a cache that's more than 18 minutes deep  
doesn't sound so horrible to me, if the scope of that server is  
constrained to some smallish [say O(1000)] number of hosts.

Tony





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