Command Reference Guide

244 ● ntp-service multicast-client 3Com Router 5000 Family and Router 6000 Family
Command Reference
ntp-service multicast-client
Purpose Use the ntp-service multicast-client command to configure NTP
multicast client mode.
Use the undo ntp-service multicast-client command to cancel NTP multicast
client mode
.
Syntax ntp-service multicast-client [ X.X.X.X ]
undo ntp-service multicast-client [ X.X.X.X ]
Parameters X.X.X.X
Multicast IP address, or a class D address.
Default By default, multicast client service is not configured and X.X.X.X is 224.0.1.1.
Example Configure Ethernet 1/0/0 to receive NTP multicast packets. The multicast address
corresponding to the multicast packets is 224.0.1.1.
[3Com] interface ethernet 1/0/0
[3Com-Ethernet1/0/0] ntp-service multicast-client 224.0.1.1
View This command can be used in the following views:
■ Interface view
Description This command specifies the interface to receive NTP multicast packets. Operating in
multicast client mode, the local device listens to multicast packets from the server.
When receiving the first multicast packet, the local device first enters a transient
client/server model to exchange messages with the remote server in order to estimate
network delay. Then it enters multicast client mode to listen to the multicast packets
and synchronizes the local clock according to the incoming multicast packets.