3Com Switch 8800 Configuration Guide Chapter 49 NTP Configuration
49-6
VI. Configuring NTP Multicast Client Mode
Designate an interface on the local Ethernet Switch to receive NTP multicast messages
and operate in multicast client mode. The local Ethernet 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 Ethernet Switch enters multicast client mode and continues
listening to the multicast and synchronizes the local clock by the arrived multicast
message.
Perform the following configuration in VLAN interface view.
Table 49-6 Configure NTP multicast client mode
Operation Command
Configure NTP multicast client mode ntp-service multicast-client
[ ip-address ]
Cancel NTP multicast client mode undo ntp-service multicast-client
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, you can set 224.0.1.1 as the multicast IP address only.
49.2.2 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 serve can provide a reliable key.
Perform the following configuration in system view.
Table 49-7 Configure NTP authentication
Operation Command
Enable NTP authentication ntp-service authentication enable
Disable NTP authentication undo ntp-service authentication enable
This configuration task is to set NTP authentication key.
Perform the following configuration in system view.