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SyncServer 600 Series User’s Guide
098-00720-000 Revision B – April, 2016
Chapter 4
Navigation Windows
The NTP Reflector is a real-time, hardware-based NTP packet identification and
time-stamping engine. The high capacity hardware uses the extremely accurate
S600 Series clock to deliver the best possible NTP timestamps. At line speed, NTP
client packets are identified, the precise and accurate T2 and T3 time stamps are
added and the packets returned to the requesting NTP client, while also
bandwidth-limiting all other packets to the CPU. Since all operations are in hardware
operating at 1GbE line speed the NTP packet capacity is in excess of 120,000 NTP
packets per second.
The NTP Reflector supports the most common NTP Mode 3 NTP client requests for
time. The NTP daemon running on the embedded CPU on the other hand is
capable of more NTP features and functions. The advantage of the SyncServer
S600 Series is that it can simultaneously perform NTP reflector operations on one
user-selectable port while conducting traditional NTP Daemon operations on the
other ports. This provides the best of both NTP operational models including
common NTP daemon functions, such as peering, clustering, selection, MD5 and
Autokey authentication. The primary trade-offs are shown in
.
Figure 4-20. NTP Packet Reflector
Table 4-6. NTP Reflector vs. NTP Daemon Performance Trade-Offs
Feature
NTP Reflector
NTP Daemon
Enhanced Security
X
120,000 NTP requests/second
X
Enhanced Time Stamp Accuracy
X
DoS Detection/Alarming
X
CPU Protection
X
NTP Peering, Clustering, Selection
X
MD5 and Autokey Functions
X