NTP Configuration Tasks 371
Table 281 describes how the above mentioned NTP modes are implemented on
the 3Com Switch 4210 Family.
c
CAUTION:
■ When the Switch 4210 is in server mode or symmetric passive mode, you need
not perform related configurations on this switch, but on the client or the
symmetric-active peer.
■ The NTP server mode, NTP broadcast mode, or NTP multicast mode takes effect
only after the local clock of the 3Com Switch 4210 has been synchronized.
■ When symmetric peer mode is configured on two Ethernet switches, to
synchronize the clock of the two switches, make sure at least one switch’s clock
has been synchronized.
NTP Configuration
Task s
Tab le 281 NTP implementation modes on the 3Com Switch 4210 Family
NTP implementation mode Configuration on the Switch 4210
Server/client mode Configure the local Switch 4210 to work in the
NTP client mode. In this mode, the remote
server serves as the local time server, while the
local switch serves as the client.
Symmetric peer mode Configure the local Switch 4210 to work in NTP
symmetric peer mode. In this mode, the remote
server serves as the symmetric-passive peer of
the Switch 4210, and the local switch serves as
the symmetric-active peer.
Broadcast mode Configure the local Switch 4210 to work in NTP
broadcast server mode. In this mode, the local
switch broadcasts NTP messages through the
VLAN interface configured on the switch.
Configure the Switch 4210 to work in NTP
broadcast client mode. In this mode, the local
Switch 4210 receives broadcast NTP messages
through the VLAN interface configured on the
switch.
Multicast mode Configure the local Switch 4210 to work in NTP
multicast server mode. In this mode, the local
switch sends multicast NTP messages through
the VLAN interface configured on the switch.
Configure the local Switch 4210 to work in NTP
multicast client mode. In this mode, the local
switch receives multicast NTP messages
through the VLAN interface configured on the
switch.
Tab le 282 NTP configuration tasks
Task Remarks
“Configuring NTP Implementation Modes” Required
“Configuring Access Control Right” Optional
“Configuring NTP Authentication” Optional
“Configuring Optional NTP Parameters” Optional
“Displaying NTP Configuration” Optional
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