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Polling for Anycast information is used when the server IP address is unknown. The first anycast server to return a
response is used to set the time value. Time levels T3 and T4 are used to determine the server time. Using Anycast time
information for synchronizing device time is preferred to using Broadcast time information.
Polling for Broadcast Time Information
Polling for Broadcast information is used when the server IP address is unknown. When a Multicast message is sent to
Multicast group, the SNTP client listens for the response. The SNTP client neither sends time information requests nor
receives responses from the Broadcast server.
MD5 (Message Digest 5) Routing Authentication safeguards device synchronization paths to SNTP servers. MD5 is an
algorithm that produces a 128-bit hash. MD5 is a variation of MD4, and increases MD4 security. MD5 verifies the integrity
of the communication, authenticates the origin of the communication.
The SNTP page contains links to the following topics:
• Global Settings
• Authentication
• Servers
• Interface Settings
SNTP Global Settings
The SNTP Global Settings page provides information for defining SNTP parameters globally.
To open SNTP Global Settings screen perform the folling:
1.
Click System -> SNTP -> Global Settings
2.
The SNTP Global Settings screen is displayed as in Figure 3-19.
The page includes the following fields:
• Poll Interval (60-86400) -- Defines the interval (in seconds) at which the SNTP server is polled for Unicast
information.
• Receive Broadcast Servers Updates -- Polls the SNTP servers for Broadcast server time information on the
selected interfaces, when enabled.
Figure 3-19 SNTP Global Settings screen
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