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XS712T Smart Switch
Time
The switch supports the Simple Network Time Protocol (SNTP). You can also set the system
time manually
SNTP assures accurate network device clock time synchronization up to the millisecond.
Time synchronization is performed by a network SNTP server. The switch software operates
only as an SNTP client and cannot provide time services to other systems.
Time sources are established by stratums. Stratums define the accuracy of the reference
clock. The higher the stratum (where zero is the highest), the more accurate the clock. The
device receives time from stratum 1 and above since it is itself a stratum 2 device.
Information received from SNTP servers is evaluated based on the time level and server
type. SNTP time definitions are assessed and determined by the following time levels:
• T1: Time at which the original request was sent by the client.
• T2: Time at which the original request was received by the server.
• T3: Time at which the server sent a reply.
• T4: Time at which the client received the server's reply.
The device can poll Unicast server types for the server time.
Polling for unicast information is used for polling a server for which the IP address is known.
SNTP servers that have been configured on the device are the only ones that are polled for
synchronization information. T1 through T4 are used to determine server time. This is the
preferred method for synchronizing device time because it is the most secure method. If this
method is selected, SNTP information is accepted only from SNTP servers defined on the
device using the SNTP Server Configuration screen.
The device retrieves synchronization information, either by actively requesting information or
at every poll interval.
Neighbor State The state of the neighbor cache entry. The following are the states for dynamic
entries in the IPv6 neighbor discovery cache:
• Reach. The neighbor is reachable through the network interface.
• Stale. The neighbor is not known to be reachable, and the switch will begin
the process to reach the neighbor.
• Delay. The neighbor is not known to be reachable, and upper-layer
protocols are attempting to provide reachability information.
• Probe. The neighbor is not known to be reachable, and the device is
attempting to probe for this neighbor.
• Unknown. The reachability status cannot be determined.
Last Updated The amount of time that has passed since the neighbor entry was last updated.
Table 5. IPv6 neighbor table fields (Continued)
Field Description