Brocade Communications Systems RFS6000 - Manual (Page 274)

272 Brocade Mobility RFS4000, RFS6000 and RFS7000 CLI Reference Guide
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Global Configuration commands
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RFController(config)#ntp peer TestPeer key 20 prefer ?
version Configure NTP version
RFController(config)#ntp peer TestPeer key 20 prefer version ?
<1-4> NTP version number
RFController(config)#ntp peer TestPeer key 20 prefer version 2
Invalid server name "TestPeer" provided. Please enter a valid name
RFController(config)#