Common Configuration Tasks
298 Basic System Configuration Guide
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A:ALA-48>config>system>time>dst-zone# offset 0
NTP
Network Time Protocol (NTP) is defined in RFC 1305, Network Time Protocol (Version 3)
Specification, Implementation and Analysis and RFC 5905, Network Time Protocol Version
4: Protocol and Algorithms Specification. It allows for participating network nodes to keep
time more accurately and maintain time in a synchronized manner between all participating
network nodes.
NTP time elements include:
• Authentication-check
• Authentication-key
• Broadcast
• Broadcastclient
• Multicast
• Multicastclient
• NTP-Server
• Peer
• Server
Authentication-check
NTP supports an authentication mechanism to provide some security and access control to
servers and clients. The default behavior when any authentication keys are configured is to
reject all NTP protocol PDUs that have a mismatch in either the authentication key-id, type,
or key. The authentication-check command provides for the options to skip or maintain this
rejection of NTP PDUs that do not match the authentication requirements.
When authentication-check is configured, NTP PDUs are authenticated on receipt. However,
mismatches cause a counter to be increased, one counter for key-id, one for type, and one for
key value mismatches.
CLI Syntax: config>system>time>ntp
authentication-check
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