3Com 8807 Configuration Manual page 758

758 C 66: NTP C
HAPTER
Configuring NTP ID
Authentication
Setting NTP
Authentication Key
Setting Specified Key as
Reliable
ONFIGURATION
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 multicast message that
arrived.
Perform the following configuration in VLAN interface view.
Table 704 Configure NTP multicast client mode
Operation
Configure NTP multicast client mode
Cancel NTP multicast client mode
Multicast IP address ip-address defaults to 224.0.1.1; this command can only be
configured on the interface where the NTP multicast packets will be received.
Actually, for the Switch 8800 Family series, you can set 224.0.1.1 as the multicast
IP address only.
Enable NTP authentication, set MD5 authentication key, and specify the reliable
key. A Client will synchronize itself by a server only if the serve can provide a
reliable key.
Perform the following configuration in system view.
Table 705 Configure NTP authentication
Operation
Enable NTP authentication
Disable NTP authentication
This configuration task is to set NTP authentication key.
Perform the following configuration in system view.
Table 706 Configure NTP authentication key
Operation
Configure NTP
authentication key
Remove NTP
authentication key
Key number number ranges from 1 to 4294967295; the key value contains 1 to
16 ASCII characters.
This configuration task is to set the specified key as reliable.
Perform the following configuration in system view.
Command
ntp-service multicast-client [ ip-address ]
undo ntp-service multicast-client
Command
ntp-service authentication enable
undo ntp-service authentication enable
Command
ntp-service authentication-keyid number
authentication-mode md5 value
undo ntp-service authentication-keyid number