Command Reference Guide

3Com Router 3000 Ethernet Family
Command Reference Guide Chapter 6 NTP Configuration Commands
3Com Corporation
6-10
By default, multicast client service is not configured and X.X.X.X is 224.0.1.1.
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.
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
6.1.12 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: Multicast IP address, a class D address. The default address is 224.0.1.1.
authentication-keyid: Specifies the ID authentication key.
keyid: Key ID used when transmitting messages to the multicast clients. It is in the
range 1 to 4294967295.
ttl: Lifetime of multicast packets.
ttl-number: Lifetime of multicast packets, in the range 1 to 255.
version: Specifies an NTP version.
number: NTP version number in the range 1 to 3.
Description
Use the ntp-service multicast-server command to configure NTP multicast server
mode.
Use the undo ntp-service multicast-server command to cancel NTP multicast server
mode.