H3C Technologies H3C MSR 5600 - Manual (Page 90)

77
Multicast server Multicast client
Authentication
result
Enable
NTP
authentic
ation
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
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 interface so that any
interface status change on the device will not cause NTP messages to be unable to be received.
When the device responds to an NTP request, the source IP address of the NTP response is always the
IP address of the interface that has received the NTP request.
Follow these guidelines when you specify the source interface for NTP messages:
• If you have specified the source interface for NTP messages in the ntp-service [ ipv6 ] unicast-server
or ntp-service [ ipv6 ] unicast-peer command, the interface specified in the ntp-service [ ipv6 ]
unicast-server or ntp-service [ ipv6 ] unicast-peer command serves as the source interface for NTP
messages.
• If you have configured the ntp-service broadcast-server or ntp-service [ ipv6 ] multicast-server
command, the source interface for the broadcast or multicast NTP messages is the interface
configured with the respective command.