OS10 Enterprise Edition User Guide Release 10.4.1.0

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Authentication

NTP authentication and the corresponding trusted key provide a reliable exchange of NTP packets with trusted time sources. NTP authentication begins with the creation of the first NTP packet after key configuration. NTP authentication uses the message digest 5 (MD5) algorithm. The key is embedded in the synchronization packet that is sent to an NTP time source.

  1. Enable NTP authentication in CONFIGURATION mode.
    ntp authenticate
  2. Set an authentication key number and key in CONFIGURATION mode (1 to 4294967295).
    ntp authentication-key 
                                           number md5 
                                           key
                                        
    • The number must match in the ntp trusted-key command.
    • The key is an encrypted string.
  3. Define a trusted key in CONFIGURATION mode (1 to 4294967295). The number must match in the ntp trusted-key command.
    ntp trusted-key 
                                           number
                                        
  4. Configure an NTP server in CONFIGURATION mode.
    ntp server {
                                           hostname | 
                                           ipv4-address | 
                                           ipv6-address} [key 
                                           keyid] [prefer]
                                        
    • hostname — Enter the keyword to see the IP address or host name of the remote device.
    • ipv4-address — Enter an IPv4 address in A.B.C.D format.
    • ipv6-address — Enter an IPv6 address in nnnn:nnnn:nnnn:nnnn:nnnn:nnnn:nnnn:nnnn format (elision of zeros is supported).
    • key keyid — Enter a text string as the key exchanged between the NTP server and the client.
    • prefer — Enter the keyword to set this NTP server as the preferred server.
  5. Configure the NTP master and enter the stratum number that identifies the NTP server hierarchy in CONFIGURATION mode (2 to 10, default 8).
    ntp master <2–10> 

Configure NTP

OS10(config)# ntp authenticate
                                 OS10(config)# ntp trusted-key 345
                                 OS10(config)# ntp authentication-key 345 mdf 0 5A60910FED211F02
                                 OS10(config)# ntp server 1.1.1.1 key 345
                                 OS10(config)# ntp master 7
                              

View NTP configuration

OS10(config)# do show running-configuration
                                 !
                                 ntp authenticate
                                 ntp authentication-key 345 mdf 0 5A60910FED211F02
                                 ntp server 1.1.1.1 key 345
                                 ntp trusted-key 345
                                 ntp master 7
                                 ...
                              

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