Configuring NTP

NTP services are disabled on all interfaces by default.

Before you begin to configure NTP, you must use the clock set command to set the time on your device to within 1,000 seconds of the Coordinated Universal Time (UTC).

Note: Multicast and broadcast NTP packets are ignored by default.

In this section:

  1. Enabling NTP
  2. Disabling NTP
  3. NTP Server Start Delay
    You can delay the NTP server response so that the synchronization time is not sent to NTP clients until the device has synchronized with an external NTP server. This can be used when an ICX switch is being used both as an NTP server, as well as a client. This should be done immediately after enabling NTP.
  4. Enabling NTP Authentication
  5. Defining an Authentication Key
  6. Specifying a Source Interface
  7. Enabling or Disabling the VLAN Containment for NTP
  8. Configuring the NTP Client
  9. Configuring the Master
  10. Configuring the NTP Peer
  11. Configuring NTP on an Interface
  12. Configuring the Broadcast Client
  13. Configuring the Broadcast Destination
    To configure the options for broadcasting Network Time Protocol (NTP) traffic, use the broadcast destination command. The NTP broadcast server can be enabled on a maximum of 16 Ethernet interfaces and four subnet addresses per interface. If the interface is operationally down or there is no IP address configured for the subnet address, the NTP broadcast server packets are not sent. By default, the broadcast mode is not enabled.
  14. Displaying NTP Status
  15. Displaying NTP Association Information
  16. Displaying NTP Association Details
  17. NTP Client Mode Configuration Example
  18. NTP Client Mode Configuration Example
  19. NTP Strict Authentication Configuration Example
  20. NTP Loose Authentication Configuration Example
  21. NTP Interface Context for the Broadcast Server or Client Mode Example
  22. NTP Broadcast Client Configuration Example
  23. NTP over Management VRF
    Network Time Protocol (NTP) traffic can be segregated from network traffic using the management VRF.
Parent topic: Network Time Protocol Version 4 (NTPv4)