3Com 10014298 manual Perform the following configurations in Vlan interface view

NTP 281

than a broadcast, multicast, or reference clock IP address. In this mode, both the local switch and the remote server can synchronize their clocks with the clock of the opposite end.

Perform the following configurations in system view.

Table 320 Configuring NTP Peer Mode

Operation	Command
Configure NTP peer mode	ntp-service unicast-peer
	ip-address [ version number
	authentication-key keyid
	source-interface { interface-name
	interface-type interface-number
	} priority ]*
Cancel NTP peer mode	undo ntp-service unicast-peer
	ip-address

NTP version number number ranges from 1 to 3 and defaults to 3; the authentication key ID keyid ranges from 1 to 4294967295; interface-nameor interface-typeinterface-numberspecifies the IP address of an interface, from which the source IP address of the NTP packets sent from the local switch to the peer will be taken; priority indicates that the peer will be the first choice for time server.

Configuring NTP Broadcast Server Mode Designate an interface on the local switch to transmit NTP broadcast packets. In this case, the local equipment operates in broadcast mode and serves as a broadcast server to broadcast messages to its clients regularly.

Perform the following configurations in VLAN interface view.

Table 321 Configuring NTP Broadcast Server Mode

Operation	Command
Configure NTP broadcast server mode	ntp-service broadcast-server [
	authentication-keyid keyid ] [
	version number ]
Cancel NTP broadcast server mode	undo ntp-service broadcast-server

NTP version number number ranges from 1 to 3 and defaults to 3; the authentication key ID keyid ranges from 0 to 4294967295. This command can only be configured on the interface where the NTP broadcast packets will be transmitted.

Configuring NTP Broadcast Client Mode Designate an interface on the local switch to receive NTP broadcast messages and operate in broadcast client mode. The local switch listens to the broadcast from the server. When it receives the first broadcast 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 broadcast client mode and continues listening to the broadcast, and synchronizes the local clock according to the arrived broadcast message.