Simple Network Time Protocol (SNTP)
SNTP is a simplified, client-only version of NTP supported
on smaller Cisco routers, such as the 1000, 1600, and 1700 platforms. SNTP
devices can only receive the time from NTP servers. They can’t be used to
provide time services to other systems.
While SNTP is simple to implement, it’s more vulnerable to a
misbehaving server than an NTP client and should be used only when strong
authentication isn’t required for the following reasons:
-
Accuracy to within 100 milliseconds versus 2 milliseconds
for NTP
-
Doesn’t provide complex filtering and statistical mechanisms
of NTP
-
Doesn’t authenticate traffic, although extended ACLs can be
configured
SNTP clients can be configured to request and accept packets from
NTP servers or to accept NTP broadcast packets from any source.
Use the global configuration sntp broadcast
client command to use the SNTP to accept NTP traffic from any broadcast
server. To prevent the router from accepting broadcast traffic, use the no form
of this command.
Rtr1(config)#sntp broadcast client
Rtr1(config)#no sntp broadcast client
The following example demonstrates using the sntp
broadcast client command and the show sntp command to
display the results.
Router(config)#sntp broadcast client
Router(config)#end
Router#show sntp
SNTP server Stratum Version Last Receive
10.0.115.2 4 3 00:00:21 Synced Bcast
Broadcast client mode is enabled.
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