Create NTP Restrict Entries
About this task
Perform the following procedure to configure the NTP restrict capability for a specific IPv4 or IPv6 address(es), which means the switch permits NTP traffic flow from the specified IP addresses only. By default the NTP restrict capability is disabled.
Note
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You can configure a maximum of 128 NTP Restrict entries (IPv4 or IPv6 addresses).
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0.0.0.0/0 or ::/0 NTP restrict entries are equivalent to no NTP restrict rules configured.
Procedure
Example
Switch:1>enable Switch:1#configure terminal Switch:1(config)#ntp restrict 192.0.0.0 Switch:1(config)#show ntp restrict ================================================================================ NTP Restrict Information ================================================================================ TYPE ADDRESS MASK/PREFIX LEN -------------------------------------------------------------------------------- IPv4 192.0.0.0 23 --------------------------------------------------------------------------------
Variable Definitions
The following table defines parameters for the ntp restrict command:
Variable |
Value |
---|---|
WORD<0-255> |
Specifies the IPv4 or IPv6 address.
Note:
You can configure a maximum of 128 IPv4 and IPv6 addresses in the NTP restrict list. |