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23
Multicast server
Multicast client
Authentication
result
Enable NTP
authenticatio
n
Configure
a key and
configure
it as a
trusted key
Associate
the key with
a multicast
server
Enable NTP
authenticatio
n
Configure
a key and
configure
it as a
trusted key
received
correctly.
Yes Yes
Yes No N/A
Failed. NTP
messages cannot
be sent and
received
correctly.
Yes No
Yes Yes N/A
Failed. NTP
messages cannot
be sent and
received
correctly.
Yes No
Yes No N/A
No authentication.
NTP messages
can be sent and
received
correctly.
Yes N/A
No Yes N/A
Failed. NTP
messages cannot
be sent and
received
correctly.
Yes N/A
No No N/A
No authentication.
NTP messages
can be sent and
received
correctly.
No N/A
N/A
Yes N/A
Failed. NTP
messages cannot
be sent and
received
correctly.
No N/A
N/A
No N/A
No authentication.
NTP messages
can be sent and
received
correctly.
Configuring NTP optional parameters
The configuration tasks in this section are optional tasks. Configure them to improve NTP security,
performance, or reliability.
Specifying the source interface for NTP messages
To prevent interface status changes from causing NTP communication failures, configure the device
to use the IP address of an interface that is always up, for example, a loopback interface, as the
source IP address for the NTP messages to be sent. Set the loopback interface as the source