Cisco 500 series Administration Manual page 101

System Time
Configuring System Time
STEP 3
STEP 4
STEP 1
STEP 2
STEP 3
Cisco 500 Series Stackable Managed Switch Administration Guide
• SNTP Anycast Client Mode (Client Broadcast Transmission)—Select to
transmit SNTP Broadcast synchronization packets requesting system time
information. If SNTP servers have been defined, the packets go to these
servers; otherwise, the packets are transmitted to all SNTP servers on the
subnet.
If the system is in Layer 3 system mode (the SG500X device is always in Layer 3
system mode), click Add to enter the interface for SNTP reception/transmission.
The Add SNTP Interface Settings page opens.
Select an interface and select the reception/transmission options.
Click Apply to save the settings to the Running Configuration file.
Defining SNTP Authentication
SNTP clients can authenticate responses by using HMAC-MD5. An SNTP server is
associated with a key, which is used as input together with the response itself to
the MD5 function; the result of the MD5 is also included in the response packet.
The SNTP Authentication page enables configuration of the authentication keys
that are used when communicating with an SNTP server that requires
authentication.
The authentication key is created on the SNTP server in a separate process that
depends on the type of SNTP server you are using. Consult with the SNTP server
system administrator for more information.
Workflow
Enable authentication in the SNTP Authentication page.
Create a key in the SNTP Authentication page.
Associate this key with an SNTP server in the SNTP Unicast page.
7
101