3Com 7757 Configuration Manual page 758

758 C 70: NTP C
HAPTER ONFIGURATION
Table 602 Configure NTP implementation modes
Operation Command
Enter VLAN interface interface interface -type
view interface-number
Configure to operate ntp-service broadcast-client
in the NTP broadcast
client mode
Configure to operate ntp-service broadcast-server
in the NTP broadcast [ authentication-keyid key-id |
server mode version number ]*
Configure to operate ntp-service multicast-client
in the NTP multicast [ ip-address ]
client mode
Configure to operate ntp-service multicast-server
in the NTP multicast [ ip-address ]
server mode [ authentication-keyid keyid |
ttl ttl-number | version
number ]*
NTP client mode
When a Switch 7750 operates in the NTP client mode,
The remote server identified by the remote-ip argument operates as the NTP
■
time server. The Switch 7750 operates as the client, whose clock is
synchronized to the NTP server. (In this case, the clock of the NTP server is not
synchronized to the local client.)
When the remote-ip argument is an IP address of a host, it cannot be a
■
broadcast or a multicast address, neither can it be the IP address of a reference
clock.
NTP peer mode
When a Switch 7750 operates in NTP peer mode,
The remote server identified by the remote-ip argument operates as the peer of
■
the Switch 7750, and the Switch 7750 operates as the active peer. The clock of
the Switch 7750 can be synchronized to the remote server or be used to
synchronize the clock of the remote server.
When the remote-ip argument is an IP address of a host, it cannot be a
■
broadcast or a multicast address, neither can it be the IP address of a reference
clock.
NTP broadcast server mode
When a Switch 7750 operates in NTP broadcast server mode, it broadcasts a clock
synchronization packet periodically. The devices which are configured to be in the
NTP broadcast client mode will respond this packet and start the clock
synchronization procedure.
NTP multicast server mode
When a Switch 7750 operates in NTP multicast server mode, it multicasts a clock
synchronization packet periodically. The devices which are configured to be in the
Description
-
Optional
By default, no Ethernet switch
operates in the NTP broadcast
client mode
Optional
By default, no Ethernet switch
operates in the NTP broadcast
server mode
Optional
By default, no Ethernet switch
operates in the NTP multicast
client mode
Optional
By default, no Ethernet switch
operates in the NTP multicast
server mode