H3C Technologies H3C S6300 Series Switches - Manual (Page 26)

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a. Finds the key according to the key ID in the message.
b. Uses the MD5 algorithm to calculate the digest.
c. Compares the digest with the digest contained in the NTP message. If they are the same, the
receiver accepts the message. Otherwise, it discards the message.
Protocols and standards
• RFC 1305, Network Time Protocol (Version 3) Specification, Implementation and Analysis
• RFC 5905, Network Time Protocol Version 4: Protocol and Algorithms Specification
Configuration restrictions and guidelines
Follow these restrictions and guidelines when you configure NTP:
• You cannot configure both NTP and SNTP on the same device.
• Do not configure NTP on an aggregate member port.
• The NTP service and SNTP service are mutually exclusive. You can only enable either NTP service
or SNTP service at a time.
• To ensure time synchronization accuracy, do not specify different reference sources for a symmetric
active peer and a symmetric passive peer if they operate as the NTP client for the client/server,
broadcast, and multicast modes.
• Make sure you use the clock protocol command to specify the time protocol as NTP. For more
information about the clock protocol command, see Fundamentals Command Reference.
• The term "interface" in this chapter collectively refers to Layer 3 interfaces.
Configuration task list
Tasks at a glance
(Required.) Enabling the NTP service
(Required.) Perform a minimum of one of the following tasks:
• Configuring NTP association modes
• Configuring the local clock as a reference source
(Optional.) Configuring access control rights
(Optional.) Configuring NTP authentication
(Optional.) Configuring NTP optional parameters
Enabling the NTP service
Step Command Remarks
1. Enter system view. system-view N/A