Cisco SR224T Administration Guide - Page 59

System Time Configuring System Time 6 • 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. STEP 3 If the system is 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. STEP 4 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 STEP 1 Enable authentication in the SNTP Authentication page. STEP 2 Create a key in the SNTP Authentication page. STEP 3 Associate this key with an SNTP server in the SNTP Unicast page. To enable SNTP authentication and define keys: STEP 1 Click Administration > Time Settings > SNTP Authentication. The SNTP Authentication page opens. STEP 2 Select SNTP Authentication to support authentication of an SNTP session between the switch and an SNTP server. Cisco Small Business 200 Series Smart Switch Administration Guide 60