Why does ntpd fail to join multicast on boot?

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Issue

Why does ntpd fail to join multicast on boot in rhel7?
ntpd not joining multicast on boot
On a RHEL7.1 system, ntpd will not join the the multicast during the boot. One everything is running, if ntpd is restarted, it will join the multicast and sync time.

Environment

Red Hat Enterprise Linux 7.1
ntp

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