3Com 10014298 manual Configuring NTP Broadcast Client Mode, Configuring NTP Multicast Server Mode

282CHAPTER 11: SYSTEM MANAGEMENT

Perform the following configurations in VLAN interface view.

Table 322 Configuring NTP Broadcast Client Mode

Operation	Command
Configure NTP broadcast client mode	ntp-service broadcast-client
Disable NTP broadcast client mode	undo ntp-service broadcast-client

This command can only be configured on the interface where the NTP broadcast packets are received.

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

Perform the following configurations in VLAN interface view.

Table 323 Configuring NTP Multicast Server Mode

Operation	Command
Configure NTP multicast server mode	ntp-service multicast-server [
	ip-address ] [
	authentication-keyid keyid ] [
	ttl ttl-number ] [ version number
	]
Cancel NTP multicast server mode	undo ntp-service multicast-server

NTP version number number ranges from 1 to 3 and defaults to 3; the authentication key ID keyid ranges from 0 to 4294967295; ttl-numberof the 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 is 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 324 Configuring 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-addressdefaults to 224.0.1.1. This command can only be configured on the interface where the NTP multicast packets is received.