25using an NTP command, while a dynamic association is a temporary association created by the systemduring operation. A dynamic association is removed if the system fails to receive messages from it overa specific long time. In client/server mode, for example, when you carry out a command to synchronizethe time to a server, the system creates a static association, and the server just responds passively uponthe receipt of a message, rather than creating an association (static or dynamic). In symmetric mode,static associations are created at the symmetric-active peer side, and dynamic associations are createdat the symmetric-passive peer side. In broadcast or multicast mode, static associations are created at theserver side, and dynamic associations are created at the client side.Examples# Set the maximum number of dynamic NTP sessions allowed to be established to 50. system-view[Sysname] ntp-service max-dynamic-sessions 50ntp-service multicast-clientUse ntp-service multicast-client to configure the device to operate in NTP multicast client mode and usethe current interface to receive NTP multicast packets.Use undo ntp-service multicast-client to remove the configuration.Syntaxntp-service multicast-client [ ip-address ]undo ntp-service multicast-client [ ip-address ]DefaultThe device does not operate in any NTP operation mode.ViewsLayer 3 Ethernet interface view, VLAN interface viewDefault command level3: Manage levelParametersip-address: Specifies the multicast IP address, which defaults to 224.0.1.1. The value ranges from224.0.1.1 to 224.0.1.254.Examples# Configure the device to operate in multicast client mode and receive NTP multicast messages onVLAN-interface 1, and set the multicast address to 224.0.1.1. system-view[Sysname] interface vlan-interface 1[Sysname-Vlan-interface1] ntp-service multicast-client 224.0.1.1ntp-service multicast-serverUse ntp-service multicast-server to configure the device to operate in NTP multicast server mode and usethe current interface to send NTP multicast packets.Use undo ntp-service multicast-server to remove the configuration.
