Timer Interaction in Route Flap Damping

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 route 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 rout...

• Type: Conference
• Year: 2005
• Where: ICDCS
• Authors: Beichuan Zhang, Dan Pei, Daniel Massey, Lixia Zhang
• Keywords: Damping, Distributed And Parallel Computing, ICDCS 2005, Route Suppression, Single Route flap