Operation Manual – NTPH3C S3100-52P Ethernet Switch Chapter 1 NTP Configuration1-16Task RemarksConfiguring an Interface on the Local Switch to Send NTPMessages OptionalConfiguring the Number of Dynamic Sessions Allowed on the LocalSwitch OptionalDisabling an Interface from Receiving NTP Messages Optional1.6.1 Configuring an Interface on the Local Switch to Send NTP MessagesFollow these steps to configure an interface on the local switch to send NTP messages:To do… Use the command… RemarksEnter system view system-view —Configure an interface on thelocal switch to send NTPmessagesntp-service source-interfaceVlan-interface vlan-id RequiredCaution:If you have specified an interface in the ntp-service unicast-server or ntp-serviceunicast-peer command, this interface will be used for sending NTP messages.1.6.2 Configuring the Number of Dynamic Sessions Allowed on the LocalSwitchA single device can have a maximum of 128 associations at the same time, includingstatic associations and dynamic associations. A static association refers to anassociation that a user has manually created by using an NTP command, while adynamic association is a temporary association created by the system during operation.A dynamic association will be removed if the system fails to receive messages from itover a specific long time.In the server/client mode, for example, when you carry out a command to synchronizethe time to a server, the system will create a static association, and the server will justrespond passively upon the receipt of a message, rather than creating an association(static or dynamic). In the symmetric mode, static associations will be created at thesymmetric-active peer side, and dynamic associations will be created at thesymmetric-passive peer side; In the broadcast or multicast mode, static associationswill be created at the server side, and dynamic associations will be created at the clientside.
