[c-nsp] New feature, can't find it documented - NTP using DNS

[Oliver Boehmer (oboehmer)]

> Hey all,
> 
> 	Ran across this by accident on a 871 running 12.4(24)T2:
> 
> 
> DE-Atlanta(config)#ntp server ip ?
>   WORD  Hostname of peer
> 
> DE-Atlanta(config)#ntp server ip pool.ntp.org ?
>   burst    Send a burst when peer is reachable
>   iburst   Send a burst when peer is unreachable
>   key      Configure peer authentication key
>   maxpoll  Maximum poll interval
>   minpoll  Minimum poll interval
>   prefer   Prefer this peer when possible
>   source   Interface for source address
>   version  Configure NTP version
>   <cr>
>
> Been wanting this for years.  Any idea what this feature is called?
Didn't
> see anything in the release notes or feature navigator about it. 

Looks like it's part of the NTPv4 feature commit.

> Curious if
> it honors DNS TTLs, etc.  I do see that it's negotiated V4 on these
peers,
> but I don't think it's a function of NTP V4.

I think the config doesn't honor TTL, so the implementation is rather
"basic"..

	oli