Configuring Optional Parameters; Specifying The Source Interface For Ntp Messages; Disabling An Interface From Receiving Ntp Messages - HP 5500 EI Series Configuration Manual

Step
3. Configure the device to
operate in NTP multicast
server mode.

Configuring optional parameters

This section explains how to configure the optional parameters of NTP.

Specifying the source interface for NTP messages

If you specify the source interface for NTP messages, the device sets the source IP address of the NTP
messages as the primary IP address of the specified interface when sending the NTP messages. NTP
packets might not be received due to state changes of an interface on the device. To avoid that problem,
specify the loopback interface as the source interface.
When the device responds to an NTP request received, the source IP address of the NTP response is
always the destination IP address of the NTP request.
Configuration guidelines
The source interface for NTP unicast messages is the interface specified in the ntp-service
•
unicast-server or ntp-service unicast-peer command.
The source interface for NTP broadcast or multicast messages is the interface where you configure
•
the ntp-service broadcast-server or ntp-service multicast-server command.
Configuration procedure
To specify the source interface for NTP messages:
Step
1. Enter system view.
2. Specify the source interface
for NTP messages.

Disabling an interface from receiving NTP messages

If NTP is enabled, NTP messages can be received from all interfaces by default. You can disable an
interface from receiving NTP messages by using the following configuration.
Command
ntp-service multicast-server
[ ip-address ]
[ authentication-keyid keyid | ttl
ttl-number | version number ] *
Command
system-view
ntp-service source-interface
interface-type interface-number
19
Remarks
A multicast server can synchronize
broadcast clients only when its
clock has been synchronized.
Remarks
N/A
By default, no source interface is
specified for NTP messages, and
the system uses the IP address of
the interface determined by the
matching route as the source IP
address of NTP messages.