Transport Segment Passive Performance Monitoring
The goal of this effort is real-time, always on, passive network
monitoring of key network metrics that impact application performance.
Passive approaches only make use of the existing packet stream without
adding or modifying packets in the network.
(TSDE) Transport Segment Delay Estimator
Funded by a U.S. Department of Energy Small Business Innovation Research
(SBIR) grant (currently in Phase II), Pollere has first focused on measuring
and isolating network delay.
The delay experienced by application packets is a powerful Internet
diagnostic. Network problems (like bufferbloat or high loss rates) and
end-node problems (like receiver or sender window limits) are both
visible in packet round trip delays. Round trip delays have long been
measured by end-node protocols to diagnose and repair loss. But this
high quality diagnostic information is only available to the end nodes
while other network elements have made do with less capable measures
such as the ping matrices produced by an active probing mesh.
Pollere has developed tools that extract high-quality round-trip and
one-way delay information from passively collected application packet
samples. The sampling can be done anywhere in the network and doesn't
require samples from both directions of a flow (e.g., the tools work in
the presence of asymmetric routing and multipath). Because the
information is mined from application traffic, it measures everything
that happens to the that traffic. So, for example, samples taken on the
one end of a campus peering link could be used not only to identify
prefixes experiencing significant bufferbloat but also to localize the
delay, determining whether the bottleneck was inside the campus network,
in the measuring ISP, or on the path to the remote destination.
The leading edge NETCONF protocol (RFC6241) is used to securely
manage TSDE's configuration and data in a standards-based
Network Management architecture
More information on TSDE
We took our prototype TSDE for a spin in a home network and found some
interesting behavior. Warning: misconceptions and misperceptions may occur
but we are happy to be better informed. See our
Fun With TSDE note.
For more information on TSDE, contact email@example.com.