MD5 (Message-Digest algorithm 5)
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.
SNTP Global Configuration
Use the SNTP Global Configuration page to view and adjust
parameters.
To display this page, click
System
>
Advanced Configuration
>
SNTP
>
Global Configuration
in the
navigation menu.
Table 79: SNTP Global Configuration Fields
Field
Description
Client Mode
Use the drop-down menu to specify the SNTP client mode, which is one of the
following modes:
•
Disable: SNTP is not operational. No SNTP requests are sent from the client
nor are any received SNTP messages processed.
•
Unicast: SNTP operates in a point to point fashion. A unicast client sends a
request to a designated server at its unicast address and expects a reply
from which it can determine the time and, optionally the round-trip delay
and local clock offset relative to the server.
•
Broadcast: SNTP operates in the same manner as multicast mode but uses a
local broadcast address instead of a multicast address. The broadcast
address has a single subnet scope while a multicast address has Internet
wide scope.
Port
Specifies the local UDP port to listen for responses/broadcasts. The allowed
range is 1 to 65535. The default value is 123.
Unicast Poll Interval
Specifies the number of seconds between unicast poll requests expressed as a
power of two when configured in unicast mode. The allowed range is 6 to 10. The
default value is 6.
Broadcast Poll Interval
Specifies the number of seconds between broadcast poll requests expressed as
a power of two when configured in broadcast mode. Broadcasts received prior
to the expiry of this interval are discarded. The allowed range is 6 to 10. The
default value is 6.
Unicast Poll Timeout
Specifies the number of seconds to wait for an SNTP response when configured
in unicast mode. The allowed range is 1 to 30. The default value is 5.
Unicast Poll Retry
Specifies the number of times to retry a request to an SNTP server after the first
time-out before attempting to use the next configured server when configured
in unicast mode. The allowed range is 0 to 10. The default value is 1.
Number of Servers Configured Specifies the number of current valid unicast server entries configured for this
client.
If you change any of the parameters, click
Submit
to apply the changes to the system. If you want the
switch to retain the new values across a power cycle, you must save the configuration.
Configuring System Information
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