R3#sh run | i ntp
ntp authentication-key 1 md5 13280E26020101 7
ntp clock-period 17208080
ntp server 180.40.7.98 key 1


R4#sh run | i ntp
ntp authentication-key 1 md5 143A0B3F05092F 7
ntp master  <------------------------------------- due to CR1 not working.
ntp server 192.10.32.254