Cisco Systems OL-16066-01 appendix K-174, 178

Appendix K Router Platform User Interface Reference

NTP Policy Page

Table K-78	NTP Server Dialog Box (Continued)
Preferred		When selected, this NTP server is preferred over other NTP servers of
		similar accuracy. If this server is used for synchronization, the time offset
		used to correct the local clock is calculated from this server only.
		Note If a different NTP server is significantly more accurate than the
		preferred server (for example, stratum 2 versus stratum 3), the router
		synchronizes to the more accurate server.
		When deselected, this NTP server is not given preference over other NTP
		servers of similar accuracy. The time offset used to correct the local clock is
		calculated by taking the combined offset of all NTP servers.
		We recommend that you configure an NTP server as preferred only when
		multiple servers have the same stratum and you can rely on the accuracy of
		the preferred server.
Authentication Key		The MD5 key that is used to authenticate associations with the NTP server.
		• Key Number—The ID number of the authentication key. Enter the key
		number or select a previously defined number from the list.
		• Key Value—An arbitrary string of up to eight characters that defines the
		authentication key. Enter the string again in the Confirm field.
		• Trusted—When selected, this key authenticates the identity of systems
		attempting to synchronize with this server. When deselected, this key is
		not used for authentication.
		If you select a key number from the list and then change the key value, you
		are warned that saving this change affects any other NTP servers using the
		same authentication key.
		Note To use authentication, you must enable it from the NTP Policy Page,
		page K-174.
OK button		Saves your changes locally on the client and closes the dialog box.
		Note To save your changes to the Security Manager server so that they are
		not lost when you log out or close your client, click Save on the
		source page.

	User Guide for Cisco Security Manager 3.2
K-178	OL-16066-01