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Parameter
X.X.X.X: Multicast IP address, that is, Class D address.
Description
Using the ntp-service multicast-client command, you can enable the NTP multicast
client mode. Using the undo ntp-service multicast-client command, you can
disable the NTP multicast client mode.
By default, multicast client service is not configured and X.X.X.X is 224.0.1.1.
With this command, you can specify the current interface on the local device to
receive NTP multicast messages and the local device to work in multicast-client mode.
The local router first detects the multicast message packets from the server. Upon the
receipt of the first broadcast 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 broadcast client mode to
assume the work of detecting the incoming multicast message packets with which it
can synchronize the local clock.
Example
Receive NTP multicast messages on the interface Ethernet 0, given the multicast
group address associated to the multicast messages is 224.0.1.1.
[3Com] interface Ethernet 0
[3Com-Ethernet0] ntp-service multicast-client 224.0.1.1
4.12 ntp-service multicast-server
Syntax
ntp-service multicast-server [ X.X.X.X ] [ authentication-keyid keyid | ttl ttl-number
| version number ] *
undo ntp-service multicast-server [ X.X.X.X ]
View
Interface view
Parameter
X.X.X.X: Class D multicast IP address, which defaults to 224.0.1.1.
authentication-keyid: Defines an authentication key.
3Com Router Command Reference Guide Addendum for V1.2
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