QTECH
Software Configuration Manual
17-214
Chapter 17
SNTP Client Configuration
17.1 Brief introduction of SNTP protocol
The working theory of SNTP is as following :
SNTPv4 can be worked in three modes : unicast, broadcast (multicast) and anycast.
In unicast mode, client actively sends requirement to server, and server sends response packet to client
according to the local time structure after receiving requirement.
In broadcast and multicast modes, server sends broadcast and multicast packets to client timing, and client
receives packet from server passively.
In anycast mode, client actively uses local broadcast or multicast address to send requirement, and all
servers in the network will response to the client. Client will choose the server whose response packet is first received
to be the server, and drops packets from others. After choosing the server, working mode is the same as that of the
unicast.
In all modes, after receiving the response packet, client resolves this packet to obtain current standard time,
and calculates network transmit delay and local time complementary, and then adjusts current time according them.
17.2 SNTP client configuration
SNTP client configuration command includes :
·
Enable/disable SNTP client
·
SNTP client working mode configuration
·
SNTP client unicast server configuration
·
SNTP client broadcast delay configuration
·
SNTP client multicast TTL configuration
·
SNTP client poll interval configuration
·
SNTP client retransmit configuration
·
SNTP client valid server configuration
·
SNTP client MD5 authentication configuration
17.2.1
Enable/disable SNTP client
Use sntp client command in global configuration mode to enable SNTP client. Use no sntp client command
to disable SNTP client. After SNTP enabling, switch can obtain standard time through internet by SNTP protocol to
adjust local system time.
Enable SNTP client using following command :
sntp client
no sntp client
For example :
! Enable SNTP client
QTECH(config)#sntp client
17.2.2
SNTP client working mode configuration
SNTPv4 can work in three modes : unicast, broadcast (multicast), anycast. In unicast and anycast, client
sends requirement and gets the response to adjust system time. In broadcast and multicast, client waits for the
broadcast packet sent by server to adjust system time.
