Configuring Ntp Access Restrictions - Cisco Catalyst 9500 Manual

Administering the Device
Step 6
Step 7
Step 8

Configuring NTP Access Restrictions

You can control NTP access on two levels as described in these sections:
Creating an Access Group and Assigning a Basic IP Access List
To create an access group and assign a basic IP access list, perform this procedure:
Procedure
Step 1
Step 2
Step 3
Command or Action
Device(config-if)# ntp broadcast client
exit
Example:
Device(config-if)# exit
[no] ntp broadcastdelay microseconds
Example:
Device(config)# ntp broadcastdelay 100
end
Example:
Device(config)# end
Command or Action
enable
Example:
Device> enable
configure terminal
Example:
Device# configure terminal
[no] ntp access-group {query-only |
serve-only | serve | peer} access-list-number
System Management Configuration Guide, Cisco IOS XE Amsterdam 17.2.x (Catalyst 9500 Switches)
Configuring NTP Access Restrictions
Purpose
Use the no form of this command to disable the
interface from receiving NTP broadcast packets.
Returns to privileged EXEC mode.
(Optional) Change the estimated round-trip
delay between the device and the NTP broadcast
server
The default is 3000 microseconds. The range
is from 1 to 999999.
Use the no form of this command to disable the
interface from receiving NTP broadcast packets.
Returns to privileged EXEC mode.
Purpose
Enables privileged EXEC mode.
Enter your password if prompted.
Enters global configuration mode.
Create an access group, and apply a basic IP
access list..
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