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Cisco Network Time Protocol - Coggle Diagram
Cisco Network Time Protocol
Synchronize clocks with central source clock
Describes algorithms between client/server and packets used.
Stratum
NTP hops from authorized time source
the client will prefer the NTP server with the lowest stratum value.
Cisco Router/Switches NTP modes
NTP client mode
NTP server mode.
NTP symmetric active mode.
Backup when external source is unavailable
Cisco Routers have two clock
Hardware (sh calendar)
ntp update-calendar
Software (sh clock)
show ntp associations
The ~ means that the clocks are not synched yet
The * means that the clocks are syched
show ntp status
Authentication
HMAC MD5