An Overview of the Reliable Server Pooling Architecture

In: Proceedings of the 12th IEEE International Conference on Network Protocols (ICNP 2004)
Buchaufsatz / Kapitel / Fach: Informatik
Zentrale wissenschaftliche Einrichtungen » Institut für Experimentelle Mathematik (IEM) Essen
The convergence of classical PSTN and IP networks requires the
transport of SS7 signalling over IP. Since SS7 has very strict availability
requirements to the signalling components, redundancy is
mandatory. The goal of the IETF RSerPool working group is to define
a lightweight, flexible and realtime redundancy concept to fulfil
the availability requirements of SS7: reliable server pooling (RSer-
Pool). RSerPool is currently under standardization, its functionality
and improvement are subject of our research.
Our poster presents our RSerPool proof-of-concept implementation
and a research oriented, discrete event based simulation model.
We provide simulation results showing limitations of the server
selection procedures defined in the standards and a way to solve
them. These improvements are now going into standardization by
the IETF. Furthermore, we present some of our results on efficient
algorithms and data structures for pool management. The poster
concludes with an outlook on our currently progressing evaluations
of service reliablity in failure scenarios.