ip-address：Means valid-server interface. Mainframe cannot be 0
wildcard：Similar to reverse the mask
【Command configuration mode】
Global configuration mode
【Usage】
In the mode of broadcast and multicast, SNTP client checks time by receiving
protocol messages sent by all servers. And it cannot filtrate the servers when
spiteful attack exists. To solve this problem, a series of valid servers can be listed
to filtrate source address of the message.
【Example】
！Add a valid-server list
QTECH(config)#sntp client valid-server 10.1.0.2 0.0.255.255
9.1.12 sntp server
Use sntp server command to configure server ip-address in unicast mode. Use no
9-14
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