Hi
use show ntp associations detail , you can see the version , most Cisco switcghes routers default use 3 but you can set to 4 now
172.21.7.110 configured, selected, sane, valid, stratum 4
ref ID 172.23.243.30, time DBEA8037.2D713518 (10:55:51.177 UTC Thu Dec 1 2016)
our mode client, peer mode server, our poll intvl 1024, peer poll intvl 1024
root delay 210.85 msec, root disp 86.82, reach 377, sync dist 201.309
delay 0.61 msec, offset 8.6657 msec, dispersion 5.58
precision 2**20, version 3
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