Administration: Time Settings
SNTP Multicast/Anycast
Cisco 350, 350X and 550X Series Managed Switches, Firmware Release 2.4, ver 0.4 123
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SNTP Multicast/Anycast
The device can be in active and/or passive mode (see SNTP Modes for more information).
To enable receiving SNTP packets from all servers on the subnet and/or to enable transmitting
time requests to SNTP servers:
STEP 1 Click Administration > Time Settings > SNTP Multicast/Anycast.
Select from the following options:
• SNTP IPv4 Multicast Client Mode (Client Broadcast Reception)—Select to receive
system time IPv4 Multicast transmissions from any SNTP server on the subnet.
• SNTP IPv6 Multicast Client Mode (Client Broadcast Reception)—Select to receive
system time IPv6 Multicast transmissions from any SNTP server on the subnet.
• SNTP IPv4 Anycast Client Mode (Client Broadcast Transmission)—Select to
transmit SNTP IPv4 synchronization packets requesting system time information. The
packets are transmitted to all SNTP servers on the subnet.
• SNTP IPv6 Anycast Client Mode (Client Broadcast Transmission)—Select to
transmit SNTP IPv6 synchronization packets requesting system time information. The
packets are transmitted to all SNTP servers on the subnet.
STEP 2 Click Add to select the interface for SNTP.
Select an interface.
STEP 3 Click Apply to save the settings to the Running Configuration file.
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.
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