| Feature | Product | Release introduced | 
|---|---|---|
| NTPv4 client for IPv4 | 5320 Series | Fabric Engine 8.6 | 
| 5420 Series | VOSS 8.4 | |
| 5520 Series | VOSS 8.2.5 | |
| 5720 Series | Fabric Engine 8.7 | |
| 7520 Series | Fabric Engine 8.10 | |
| 7720 Series | Fabric Engine 8.10 | |
| VSP 4900 Series | VOSS 8.1 | |
| VSP 7400 Series | VOSS 8.0 | |
| NTPv4 client for IPv6 | 5320 Series | Fabric Engine 8.6 | 
| 5420 Series | VOSS 8.4 | |
| 5520 Series | VOSS 8.2.5 | |
| 5720 Series | Fabric Engine 8.7 | |
| 7520 Series | Fabric Engine 8.10 | |
| 7720 Series | Fabric Engine 8.10 | |
| VSP 4900 Series | VOSS 8.1 | |
| VSP 7400 Series | VOSS 8.0 | |
| NTPv4 master and restrict | 5320 Series | Fabric Engine 8.6 | 
| 5420 Series | VOSS 8.4 | |
| 5520 Series | VOSS 8.2.5 | |
| 5720 Series | Fabric Engine 8.7 | |
| 7520 Series | Fabric Engine 8.10 | |
| 7720 Series | Fabric Engine 8.10 | |
| VSP 4900 Series | VOSS 8.1 | |
| VSP 7400 Series | VOSS 8.0 | |
| NTP Authentication Key Obfuscation | 5320 Series | Fabric Engine 8.8 | 
| 5420 Series | Fabric Engine 8.8 | |
| 5520 Series | Fabric Engine 8.8 | |
| 5720 Series | Fabric Engine 8.8 | |
| 7520 Series | Fabric Engine 8.10 | |
| 7720 Series | Fabric Engine 8.10 | |
| VSP 4900 Series | VOSS 8.8 | |
| VSP 7400 Series | VOSS 8.8 | |
| NTP Server configuration using fully qualified domain name (FQDN) | 5320 Series | Fabric Engine 8.10 | 
| 5420 Series | Fabric Engine 8.10 | |
| 5520 Series | Fabric Engine 8.10 | |
| 5720 Series | Fabric Engine 8.10 | |
| 7520 Series | Fabric Engine 8.10 | |
| 7720 Series | Fabric Engine 8.10 | |
| VSP 4900 Series | VOSS 8.10 | |
| VSP 7400 Series | VOSS 8.10 | 
The following sections provide information on NTPv4.

Important
For NTPv4:
The switch can operate as both NTPv4 client and NTPv4 server.
The server selection algorithm can deem a server to be unfit to sync even though there is connectivity.
It can take several iterations (intervals) for the server to sync.
You must configure a Segmented Management Instance on applicable switches before you use NTPv4.