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Problem: Route Flapping

Routers can occasionally enter a state in which they periodically switch route – typically every few minutes. This results in the delay alternately increasing and reducing.

Impact

As this usually occurs at a fairly low frequency (say every 30 seconds) then the impact on VoIP call quality is small, generally appearing as an occasional “tick”. .

Resolution

Use traceroute to determine where the problem is occurring. Resolution may require reconfiguration of routers.

Tools:

Traceroute

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