Netgear GS748Tv4 GS748Tv4 Software Administration Manual - Page 40
Time, GS748T Smart Switch software supports the Simple Network Time Protocol SNTP. You can
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GS748T Smart Switch Software Administration Manual • Reach. Positive confirmation was received within the last Reachable Time milliseconds that the forward path to the neighbor was functioning properly. While in REACH state, the device takes no special action as packets are sent. • Stale. More than ReachableTime milliseconds have elapsed since the last positive confirmation was received that the forward path was functioning properly. While in STALE state, the device takes no action until a packet is sent. • Delay. More than ReachableTime milliseconds have elapsed since the last positive confirmation was received that the forward path was functioning properly. A packet was sent within the last DELAY_FIRST_PROBE_TIME seconds. If no reachability confirmation is received within DELAY_FIRST_PROBE_TIME seconds of entering the DELAY state, send a neighbor solicitation message and change the state to PROBE. • Probe. A reachability confirmation is actively sought by resending neighbor solicitation messages every RetransTimer milliseconds until a reachability confirmation is received. • Last Updated. Time since the address was confirmed to be reachable. To configure the network information for a IPv6 network: • REFRESH. Refreshes the screen with most recent data. • CLEAR. Clear IPv6 neighbors on selected interface or all interfaces. Time GS748T Smart Switch software 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. GS748T Smart 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. The following is an example of stratums: • Stratum 0: A real-time clock is used as the time source, for example, a GPS system. • Stratum 1: A server that is directly linked to a Stratum 0 time source is used. Stratum 1 time servers provide primary network time standards. • Stratum 2: The time source is distanced from the Stratum 1 server over a network path. For example, a Stratum 2 server receives the time over a network link, via NTP, from a Stratum 1 server. 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: 40 | Chapter 2: Configuring System Information