[routing-wg] Note on ripe-580: BGP flap damping

Hi,

just a heads up in regard to ripe-580. It states that "The default
values used in current implementations of RFD apply a penalty of 1000
each time a route flaps".

At least for Juniper that is not the case.  Or to quote them directly:

        A figure-of-merit value of zero is assigned to each new route. The
        value is increased each time the route is withdrawn or readvertised,
        or when one of its path attributes changes. With each incident of
        instability, the value increases as follows:

        Route is withdrawn: 1000

        Route is readvertised: 1000

        Route's path attributes change: 500

        Note:

        Other vendors' implementations for figure-of-merit
        increase the value only when a route is withdrawn.
        The Junos OS implementation for figure-of-merit
        increases the value for both route withdrawal and
        route readvertisement. To accommodate other
        implementations for figure-of-merit, multiply the
        reuse and suppress threshold values by 2.

So yeah, if you want to use ripe-580 on Junos gear you should probably
multiply the suppress/cutoff value by 2.

Regards

Sebastian

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