[c-nsp] Use NTP server for syncing but do not respond to NTP requests

[Phil Mayers]

On 22/03/2014 16:10, Nick Hilliard wrote:
> On 22/03/2014 15:31, Andrew Clark wrote:
>> Take a look at NTP access-groups.  You can control access for each
>> aspect (server, peer, etc).  Details here:
>
> CSCuj66318: "15.2 ntp allows query with access-group configured"

Gee, it's a good job Cisco have a strong control-plane filtering feature 
on all platforms, without any horrible caveats like conflating glean and 
receive traffic, or matching outer MPLS label rather than inner IP 
header in L3VPN setups, and without crazy maintenance overhead of 
building an ACL with all local receive adjacencies in it!

Oh wait...