When I was doing PoC for IPv6 transition, I had to work with NTPv4 for native IPv6. I am using 3825 running 12.4(24)T adv enterprise.
As per Cisco documents NTPv4 is supported in 2 modes.
1. Client - Server.
I am presently interested in Client Server Mode
In this mode I configured Server with command. 'ntp master 2'
And on the client I configured:
ntp server FD00:0:0:60::1 source Loopback0
Loopbacks of both server and client are reachable using OSPF.
But NTP remains unsynchronised forever.
Are there any known issues with NTPv4 over native IPv6 ?