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Configuring the Switch to Listen for Broadcast Messages Using NTP

When you are using NTP, you can configure the local switch to listen for broadcast messages on the local network to discover other servers on the same subnet by including the broadcast-client statement at the [edit system ntp] hierarchy level:

When the switch detects a broadcast message for the first time, it measures the nominal network delay using a brief client-server exchange with the remote server. It then enters broadcast client mode, in which it listens for, and synchronizes to, succeeding broadcast messages.

To avoid accidental or malicious disruption in this mode, both the local and remote systems must use authentication and the same trusted key and key identifier.