ntp peer ip-address [version number] [key keyid] [source interface] [prefer]
no ntp peer ip-address
ip-address IP address of the peer providing, or being provided, the clock synchronization. version (Optional) Defines the Network Time Protocol (NTP) version number. number (Optional) NTP version number (1 to 3). key (Optional) Defines the authentication key. keyid (Optional) Authentication key to use when sending packets to this peer. source (Optional) Names the interface. interface (Optional) Name of the interface from which to pick the IP source address. prefer (Optional) Makes this peer the preferred peer that provides synchronization.
To configure the software clock to synchronize a peer or to be synchronized by a peer, use the ntp peer global configuration command. To disable this capability, use the no form of this command.
No peers are configured by default. If a peer is configured, the default NTP version number is 3, no authentication key is used, and the source IP address is taken from the outgoing interface.
Use this command if you want to allow this machine to synchronize with the peer, or vice versa. Using the prefer keyword reduces switching back and forth between peers.
The following address family configuration example configures network 10.108.0.0 as a local network and network 192.168.7.0 as a backdoor network:Router(config)#ntp peer 192.168.22.33 version 2 source ethernet 0
If you are using the default version of 3 and NTP synchronization does not occur, try using NTP version 2 (NTPv2).
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