NTP time synchronization in chassis cluster

Network Time Protocol (NTP) is used to synchronize the time between the Packet Forwarding Engine and the Routing Engine in a standalone device and between two devices in a chassis cluster. In standalone device and chassis cluster mode, the primary Routing Engine runs the NTP process to get the time from the external NTP server. The secondary Routing Engine uses NTP to get the time from the primary Routing Engine. On both standalone devices and clusters, the Packet Forwarding Engine uses NTP to get the time from the local Routing Engine.