Operation Manual – NTPH3C S3100 Series Ethernet Switches Chapter 1 NTP Configuration1-8Note:z The remote server specified by remote-ip or server-name serves as the NTP server,and the local switch serves as the NTP client. The clock of the NTP client will besynchronized by but will not synchronize that of the NTP server.z remote-ip cannot be a broadcast address, a multicast address or the IP address ofthe local clock.z After you specify an interface for sending NTP messages through thesource-interface keyword, the source IP address of the NTP message will beconfigured as the primary IP address of the specified interface.z A switch can act as a server to synchronize the clock of other switches only after itsclock has been synchronized. If the clock of a server has a stratum level lower thanor equal to that of a client’s clock, the client will not synchronize its clock to theserver’s.z You can configure multiple servers by repeating the ntp-service unicast-servercommand. The client will choose the optimal reference source.1.3.2 Configuring the NTP Symmetric Peer ModeFor switches working in the symmetric peer mode, you need to specify asymmetric-passive peer on the symmetric-active peer.Table 1-4 Configure a symmetric-active switchOperation Command DescriptionEnter system view system-view —Specify asymmetric-passive peer for theswitchntp-service unicast-peer{ remote-ip | peer-name }[ authentication-keyid key-id |priority | source-interfaceVlan-interface vlan-id | versionnumber ]*RequiredBy default, a switch is notconfigured to work in thesymmetric mode.
