Точное время

Отчего же? Даже на ipbase NTP прекрасно работает:

RTR003#sho ver | inc .bin
System image file is "flash:c2801-ipbasek9-mz.124-24.T.bin"
RTR003#sho ntp status
Clock is synchronized, stratum 4, reference is 10.10.10.100
nominal freq is 250.0000 Hz, actual freq is 250.0263 Hz, precision is 2**24
reference time is CE70276A.2D9383B0 (11:16:58.178 MSD Fri Oct 2 2009)
clock offset is 0.0105 msec, root delay is 0.38 msec
root dispersion is 0.12 msec, peer dispersion is 0.01 msec
loopfilter state is 'CTRL' (Normal Controlled Loop), drift is -0.000105351 s/s
system poll interval is 1024, last update was 391 sec ago.
RTR003#sho ntp ass

address ref clock st when poll reach delay offset disp
*~10.10.10.100 192.73.48.1 3 401 1024 377 0.000 10.509 18.660
* sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured
RTR003#
По моему (не уверен), SNTP используется на младших моделях: Cisco 1003, Cisco 1004, Cisco 1005, Cisco 1600, Cisco 1720, Cisco 1750.