3Com 3031 Command Reference Manual page 110

110 C 2: S M & M C
HAPTER YSTEM AINTENANCE ANAGEMENT OMMANDS
undo ntp-service multicast-client [ X.X.X.X ]
View
Interface view
Parameter
X.X.X.X: Multicast IP address, which is a Class D address.
Description
Using the ntp-service multicast-client command, you can configure the NTP
multicast client mode. Using the undo ntp-service multicast-client command, you
can remove the NTP multicast client mode.
By default, no multicast client service is configured and the X.X.X.X is 224.0.1.1.
This command is used to specify an interface on the local device to receive the NTP
multicast packets. The local device is run in client mode. It first listens discreetly to
the multicast packets from the server. When the first multicast packet is received,
the local device enables a short client/server mode to exchange messages with the
remote server in order to estimate network delay. Then it enters the client
(multicast-client) mode to listen discreetly to the multicast packets and synchronize
the local clock according to the coming multicast packets.
Example
Configure Ethernet 1/0/0 to receive NTP multicast packets. The multicast address
corresponding to the multicast packets is 244.0.1.1.
[3Com] interface ethernet 1/0/0
[3Com-Ethernet1/0/0] ntp-service multicast-client 224.0.1.1
ntp-service Syntax
multicast-server
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, which is a Class D address. The default address is
224.0.1.1.
authentication-keyid: Defines the ID authentication key.
keyid: ID number used when transmitting messages to the multicast clients in the
range of 1 to 4294967295.
ttl: Defines the life span of the multicast packet.