Netgear GS716Tv2 - ProSAFE 16-Port Gigabit Managed Switch Guia Do Administrador

Time

GS716T and GS724T Smart Switches 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. GS716T and GS724T Smart 
Switches 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.

Neighbor State

Specifies the state of the neighbor cache entry. The following are the states for 
dynamic entries in the IPv6 neighbor discovery cache:
•  Reachable. 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.

•  Unknown. The switch cannot determine the state of the cache entry.

Last Updated.

Time since the address was confirmed to be reachable.