1-5NTP implementationmode Configuration on Switch 4210Multicast modez Configure the local Switch 4210 to work in NTP multicast servermode. In this mode, the local switch sends multicast NTPmessages through the VLAN interface configured on the switch.z Configure the local Switch 4210 to work in NTP multicast clientmode. In this mode, the local switch receives multicast NTPmessages 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 performrelated 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 thelocal clock of the Switch 4210 has been synchronized.z When symmetric peer mode is configured on two Ethernet switches, to synchronize the clock of thetwo switches, make sure at least one switch’s clock has been synchronized.NTP Configuration TasksTable 1-2 NTP configuration tasksTask RemarksConfiguring NTP Implementation Modes RequiredConfiguring Access Control Right OptionalConfiguring NTP Authentication OptionalConfiguring Optional NTP Parameters OptionalDisplaying NTP Configuration OptionalConfiguring NTP Implementation ModesA Switch 4210 can work in one of the following NTP modes:z Configuring NTP Server/Client Modez Configuring the NTP Symmetric Peer Modez Configuring NTP Broadcast Modez Configuring NTP Multicast ModeTo protect unused sockets against attacks by malicious users and improve security, Switch 4210provide the following functions:
