Timer interaction in route flap damping

Beichuan Zhang, Dan Pei, Daniel Massey, Lixia Zhang

Research output: Contribution to conferencePaperpeer-review

10 Scopus citations


Route Flap Damping is a mechanism generally used in network routing protocols. Its goal is to limit the global impact of unstable routes by temporarily suppressing routes with rapid changes over short time periods. Although route damping is a clearly defined and simple procedure at each router, its effect in a large network setting is not well understood. We show that the current damping design leads to the intended behavior only under persistent route flapping. When the number of flaps is small, the global routing dynamics deviates significantly from the expected behavior with a longer convergence delay. Previous work observed that a single route flap can falsely trigger mute suppression due to path exploration. However our simulations show that this false suppression only accounts for 30% of the convergence delay after a single route flap. Our study reveals previously unknown interactions between reuse timers at different routers. Route suppression and reuse at different routers are triggered at different times and thus affect the number of updates received by other routers. In turn, this impacts other routers' damping behavior. We propose to use Root Cause Notification to eliminate both false suppression and undesirable timer interaction.

Original languageEnglish (US)
Number of pages11
StatePublished - 2005
Event25th IEEE International Conference on Distributed Computing Systems - Columbus, OH, United States
Duration: Jun 6 2005Jun 10 2005


Other25th IEEE International Conference on Distributed Computing Systems
Country/TerritoryUnited States
CityColumbus, OH

ASJC Scopus subject areas

  • Software
  • Hardware and Architecture
  • Computer Networks and Communications


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