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NTP sync issue

Dear All,

            Currently we have 2 NTP peers (acting as server for rest of Network devices) and their ref clock is from NTP master (Hardware).

NTP PEER#1 runs on 12.x IOS

NTP PEER#2 runs on 15.x IOS

configuration on peers looks like

ntp access-group peer 5

ntp acces-group serve 6

ACL 5 has ip address for peers and 6 has rest of network devices IP. (confirmed reachabilty between all devices)

On clients, the configuration is

ntp server peer#1

ntp server peer#2

On all clients (3750,6500 and routers) we can see the PEER#1 is synced and getting their time from it but PEER#2 is insane and startum is 16.

When we checked on PEER#2, show ntp packets, it shows NTP bad version packets are increasing.

Thanks & Regards

Ahmed

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