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.

Enter global configuration mode.
```
device# configure terminal
```

Enter management interface mode.
```
device(config)# interface management 1
```

Enter the IPv4 subnet address of the device to send NTP broadcast messages.
```
device(config-if-mgmt-1)# ip address 10.20.99.173/24
```

Enter the management interface.
```
device(config-ntp)# ntp-interface management 1
```

Define the authentication key to send the NTP broadcast traffic. By default, no authentication key is configured.
```
device(config-ntp-mgmt-1)# broadcast destination 10.20.99.0 key 2
```
The default NTP version number is 4.

Network Time Protocol Version 4 (NTPv4)

Configuring the Broadcast Destination