1-5
NTP implementation
mode
Configuration on Switch 4210
Multicast mode
z 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.
z 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.
z When an Switch 4210 works in server mode or symmetric passive mode, you need not to perform
related configurations on this switch but do that on the client or the symmetric-active peer.
z The NTP server mode, NTP broadcast mode, or NTP multicast mode takes effect only after the
local clock of the Switch 4210 has been synchronized.
z 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 Tasks
Table 1-2 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
Configuring NTP Implementation Modes
A Switch 4210 can work in one of the following NTP modes:
z Configuring NTP Server/Client Mode
z Configuring the NTP Symmetric Peer Mode
z Configuring NTP Broadcast Mode
z Configuring NTP Multicast Mode
To protect unused sockets against attacks by malicious users and improve security, Switch 4210
provide the following functions:
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