R3#sh run | b ntp
ntp authentication-key 1 md5 143A0B3F05092F 7
ntp server 180.40.7.98 key 1
!
end

R4#sh run | b ntp
ntp authentication-key 1 md5 112400311E1F0E 7
ntp clock-period 17179873
ntp server 192.10.32.254
!