3Com 10014303 - Manual (Page 46)

Table 4-4 Configure NTP broadcast client mode
Operation Command
Configure NTP broadcast client mode ntp-service broadcast-client
Disable NTP broadcast client mode undo ntp-service broadcast-client
This command must be configured on the interface to be used for receiving NTP
broadcast messages.
V. Configure NTP multicast server mode
This task specifies an interface on the local router to send NTP multicast messages.
In this case, the local router is running as a multicast server and periodically sends
multicast messages to the multicast clients.
Perform the following configuration in interface view.
Table 4-5 Configure NTP multicast server mode
Operation Command
Configure NTP multicast server mode
ntp-service multicast-server [ X.X.X.X ] [ authentication-keyid
keyed | ttl ttl-number | version number ] *
Disable NTP multicast server mode undo ntp-service multicast-server
NTP version is in the range of 1 to 3 and defaults to 3, authentication key ID is in the
range of 1 to 4294967295, the Time-To-Live (TTL) value of multicast packets is in the
range of 1 to 255, and the multicast IP address defaults to 224.0.1.1.
This command must be configured on the interface to be used for sending NTP
multicast messages.
VI. Configure NTP multicast client mode
This task specifies an interface on the local router to receive NTP multicast messages.
In this case, the local router is running as a multicast client. The local router first
detects the multicast message packets from the server. Upon the receipt of the first
message packet, the local router enters a temporary Client/Server mode to exchange
the message with the remote server for the purpose of estimating the network delay,
and then it switches to the multicast client mode to assume the work of detecting the
multicast message packets with which it can synchronize the local clock.
Perform the following configuration in interface view.
3Com Router Configuration Guide Addendum for V1.20
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