098-00720-000 Revision D1 – February, 2018 SyncServer 600 Series User’s Guide 107
Chapter 4
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The SyncServer S6x0 Series implements real-time, hardware-based network
packet processing in tandem with accurate hardware based NTP/PTP time
stamping, general packet limiting and alarming. The reflector protects the
SyncServer CPU from excessive network traffic Denial of Service (DoS) attacks,
while concurrently providing high-bandwidth, high-accuracy NTP/PTP operations.
The system uses a real-time, hardware-based NTP/PTP packet identification and
time-stamping engine. The high capacity hardware uses the extremely accurate
S6x0 Series clock to deliver the best possible NTP/PTP timestamps. At line speed,
NTP/PTP client packets are identified, the precise and accurate time stamps are
added and the packets returned to the requesting NTP/PTP client, while also
bandwidth-limiting all other packets to the CPU. Since all operations are in hardware
operating at 1GbE or 10 GbE line speed the packet capacity is in excess of 360,000
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
S6x0 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 Table 4-9.
Figure 4-23. NTP Packet Reflector
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