Users Guide

Managing General System Settings 469
Requesting the time from a unicast SNTP server is more secure. Use this
method if you know the IP address of the SNTP server on your network. If you
allow the switch to receive SNTP broadcasts, any clock synchronization
information is accepted, even if it has not been requested by the device. This
method is less secure than polling a specified SNTP server.
To increase security, authentication can be required between the configured
SNTP server and the SNTP client on the switch. Authentication is provided
by Message Digest 5 (MD5). MD5 verifies the integrity of the
communication and authenticates the origin of the communication.
What Configuration Is Required for Plug-In Modules?
The Dell EMC Networking N3000E-ON/N3100-ON Series switches support
several different plug-in modules (also known as cards) for the expansion slots
located on the back of the switch. For information about the slots and the
supported modules, see "Hardware Overview" on page 111. The card type can
be preconfigured prior to inserting it into the switch.
Hot-swap is supported on the Dell EMC Networking N3000E-ON and
N3100-ON Series switch modules.
Before inserting a new module into the expansion slot that was previously
occupied by a different type of module, issue a no slot command from the
CLI so that the switch can recognize the new module. If the no slot
command is issued after the new type of module is inserted, it may be
necessary to remove and re-insert the module.
Once a module has been recognized by the switch, its configuration is stored
locally on the switch as the switch default. The module configuration appears
in the running-config for informational purposes.
Default General System Information
By default, no system information or time information is configured, and the
SNTP client is disabled. The default SDM Template applied to the switch is
the Dual IPv4-IPv6 template.