Default Gateway : 10.0.9.80
VLAN Name MAC Address | IP Address
------------ ------------------- + -------------------
DEFAULT_VLAN 001279-88a100 | Disabled
VLAN10 001279-88a100 | 10.0.10.17
Adding and deleting SNTP server addresses
Adding addresses
As mentioned earlier, you can configure one SNTP server address using either the Menu interface or the CLI. To
configure a second and third address, you must use the CLI. To configure the remaining two addresses, you
would do the following:
Creating additional SNTP server addresses with the CLI
switch(config)# sntp server priority <1-3> 2001:db8::215:60ff:fe79:8980
switch(config)# sntp server 10.255.5.24
NOTE: If there are already three SNTP server addresses configured on the switch, and you want to
use the CLI to replace one of the existing addresses with a new one, you must delete the unwanted
address before you configure the new one.
Deleting addresses
Syntax:
no sntp server <ip-addr>
Deletes a server address. If there are multiple addresses and you delete one of them, the switch re-orders the
address priority.
Example:
To delete the primary address in the above Example: and automatically convert the secondary address to primary:
switch(config)# no sntp server 10.28.227.141
SNTP messages in the Event Log
If an SNTP time change of more than three seconds occurs, the switch's Event Log records the change. SNTP
time changes of less than three seconds do not appear in the Event Log.
Network Time Protocol (NTP)
All NTP communications use Coordinated Universal Time (UTC). An NTP server usually receives its time from an
authoritative time source, such as a radio clock or an atomic clock attached to a time server, and then distributes
this time across the network. NTP is extremely efficient; no more than one packet per minute is necessary to
synchronize two machines to within a millisecond of each other.
NTP uses a stratum to describe the distance between a network device and an authoritative time source:
• A stratum 1 time server is directly attached to an authoritative time source (such as a radio or atomic clock or a
GPS time source).
• A stratum 2 NTP server receives its time through NTP from a stratum 1 time server.
Chapter 2 Time Protocols 49
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