Why Is The System Time Needed; How Does Sntp Work - Dell M6220 User Configuration Manual

Table 11-3. SDM Template Parameters and Values (Continued)
Parameter
ECMP next hops
IPv4 multicast routes
IPv6 multicast routes
SDM Template Configuration Guidelines
When you configure the switch to use an SDM template that is not currently
in use, you must reload the switch for the configuration to take effect.
NOTE:
If you attach a unit to a stack and its template does not match the stack's
template, then the new unit will automatically reboot using the template used by
the management unit. To avoid the automatic reboot, you may first set the
template to the template used by the management unit. Then power off the new
unit, attach it to the stack, and power it on.
If the IPv4 Routing or IPv4 Data Center template is currently in use and you
attempt to configure IPv6 routing features without first selecting the Dual
IPv4-IPv6 Routing template, the IPv6 commands do not take effect. IPv6
features are not available when an IPv4-only template is active.

Why is the System Time Needed?

The switch uses the system clock to provide time stamps on log messages.
Additionally, some show commands include the time in the command
output. For example, the show users login-history command includes a Login
Time field. The system clock provides the information for the Login Time
field.

How Does SNTP Work?

SNTP assures accurate switch clock time synchronization. Time
synchronization is performed by a network SNTP server.
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 switch is at a stratum that is one lower than its
time source. For example, if the SNTP server in an internal network is a
Stratum 3 device, the switch is a Stratum 4 device.
Dual IPv4/IPv6
4
1536
512
Managing General System Settings
IPv4 Only
4
2048
0
IPv4 Data Center
16
2048
0
249