> default type tunnel rtt-min 1 rtt-max 1001 max-rtt-penalty 1000 > enable-timestamps true > ``` > It causes the RTT to be equal to the latency to the other node.
More precisely, it causes the cost to be equal to the RTT. The recommended default values are much more conservative: rtt-min 10 rtt-max 120 This causes RTTs below 10ms to be considered as all equally good, and links above 120ms to all be considered as equally bad. The result is that minor oscillations of the metrics of high-rtt links do not cause cost fluctuations, which avoids oscillations. It is of course possible that these values are not appropriate in your network; however, I fear that the extremely aggressive values that you describe above may cause unnecessary oscillations, especially since BIRD does not yet implement hysteresis on metrics. -- Juliusz
