3Com SuperStack 4 Configuration Manual page 349

Table 440 Configure NTP Multicast Server Mode
Operation
Configure NTP multicast server
mode
Cancel NTP multicast server mode undo ntp-service multicast-server
NTP version number
number
authentication key ID
keyid
multicast packets ranges from 1 to 255; and the multicast IP address defaults to
224.0.1.1.
This command can only be configured on the interface where the NTP multicast
packet will be transmitted.
Configuring NTP Multicast Client Mode
Designate an interface on the local Switch to receive NTP multicast messages and
operate in multicast client mode. The local Switch listens to the multicast from the
server. When it receives the first multicast packets, it starts a brief client/server
mode to Switch messages with a remote server for estimating the network delay.
Thereafter, the local Switch enters multicast client mode and continues listening to
the multicast and synchronizes the local clock by the arrived multicast message.
Perform the following configurations in VLAN interface view.
Table 441 Configure NTP multicast client mode
Operation
Configure NTP multicast client
mode
Cancel NTP multicast client mode
Multicast IP address
ip-address
configured on the interface where the NTP multicast packets will be received.
Configuring NTP ID Authentication
Enable NTP authentication, set MD5 authentication key, and specify the reliable
key. A client will synchronize itself by a server only if the server can provide a
reliable key.
Perform the following configurations in System View.
Table 442 Configure NTP Authentication
Operation
Enable NTP authentication
Disable NTP authentication
Setting NTP Authentication Key
This configuration task is to set NTP authentication key.
Perform the following configurations in System View.
Command
ntp-service multicast-server [
] [ authentication-keyid
ttl-number
] [ version
ranges from 1 to 3 and defaults to 3; the
ranges from 0 to 4294967295;
Command
ntp-service multicast-client [
ip-address
]
undo ntp-service multicast-client
defaults to 224.0.1.1. This command can only be
Command
ntp-service authentication enable
undo ntp-service authentication enable
NTP Configuration 361
ip-address
keyid
] [ ttl
number
]
of the
ttl-number