Fortinet MR1 - Manual (Page 240)

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Syntax
clear dns counter
Default Setting
None
Command Mode
Privileged Exec
5.11.1.9 clear dns cache
This command clears all entries from the DNS cache.
Syntax
clear dns cache
Default Setting
None
Command Mode
Privileged Exec
5.11.1.10 clear cdp
This command is used to clear the CDP neighbors information and the CDP packet counters.
Syntax
clear cdp [traffic]
traffic - this command is used to clear the CDP packet counters.