User Manual Q&AAnswer
Jul 03, 2025 - 09:21 AM
To configure NTP authentication on your Cisco Nexus 3000 Low-Latency Switch, follow these steps:
1. **Define Authentication Keys:**
- Enter global configuration mode: `configure terminal`
- Define an authentication key with a number and an MD5 string: `ntp authentication-key number md5 md5-string`
Example: `ntp authentication-key 42 md5 aNiceKey`
2. **Associate Keys with NTP Server/Peer:**
- Enable authentication for the NTP server or peer by specifying the key: `ntp server ip-address key key-id` or `ntp peer ip-address key key-id`
Example: `ntp server 192.0.2.1 key 1001`
3. **Specify Trusted Keys:**
- Specify which keys an unconfigured remote time source must provide for synchronization: `ntp trusted-key number`
Example: `ntp trusted-key 42`
4. **Enable NTP Authentication:**
- Enable authentication for NTP passive, broadcast client, or multicast: `ntp authenticate`
5. **Verify Configuration:**
- Check the configured authentication keys: `show ntp authentication-keys`
- Check the configured trusted keys: `show ntp trusted-keys`
- Check the status of NTP authentication: `show ntp authentication-status`
By following these steps, you can configure NTP authentication on your Cisco Nexus 3000 Low-Latency Switch to ensure that only trusted time sources can synchronize with your network, enhancing security and preventing unauthorized time updates.
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