Dell N3200-ON Networking N-Series Switches CLI Reference Guide version 6.8.0 - Page 2002

the list is selected as the active server to be used for polling based on priority and configured order. A server can be configured as preferred server to take preference. The servers are treated alike independent of IPv4 or IPv6 or hostname address formats. At any given point of time, the client operates in unicast or broadcast mode. In broadcast mode, NTP client listens on the well-known multicast group address 224.0.1.1 (reserved for NTP) for server packets from IPv4 networks on port number 123. On IPv6 networks, the NTP client listens to the link-local scoped IANA multicast address ff02::101 (reserved for NTP) for server packets on port number 123. The client logic to handle packet contents does not change with support for IPv6 networks. NTP over IPv6 network is available on platforms that support IPv6 Management. NTP over VRF is also available only on VRF-supported platforms. When a source-interface is configured, the client server communication uses the IP address specific to the configured interface. Access is limited for NTP clients to known or trusted NTP broadcast servers. Timing synchronization is based on the information from properly-signed NTP messages. For this purpose, authentication keys are configured and only trusted keys are considered for communication with the time source. NTP is only supported on N22xx and N32xx platforms. ntp server Use this command to configure the NTP server to allow the system clock to be synchronized by a time server. Syntax ntp server {ip-address|ipv6-address|hostname} [version number] [key keyid] [minpoll interval] [maxpoll interval] [prefer] [burst] [iburst] no ntp server {ip-address|ipv6-address|hostname} • ip-address - Server address (IPv4/IPv6) for this client to synchronize time. • hostname - Hostname of the server. (Range: 1 to 256 characters.) • version - The protocol version. The default is 4. The range is 1 to 4. • key - Authentication Key. The key-id range 1 to 4,294,967,295. • minpoll - Minimum polling interval in seconds as a power of 2. The range is 4 to 17, which in seconds is 16 seconds to 131072 seconds. The default is 64 seconds. Switch Management Commands 2002