Flapping (BGP)

≡Description

'Flapping' in the context of BGP (Border Gateway Protocol) refers to the rapid change of a route's state between active and inactive. This phenomenon can occur when a route becomes unreachable and is then repeatedly re-announced in a short period of time. Flapping can cause network instability, as BGP routers may experience difficulties converging and maintaining a consistent routing table. This behavior can result in an increase in control traffic, as routers must continuously process route state updates. Additionally, flapping can lead to packet loss and overall degraded network performance. To mitigate these effects, various techniques are implemented, such as the use of flap damping timers, which help stabilize routes and reduce the amount of unnecessary updates propagated through the network.