[c-nsp] IOS XR Multicast RPF Check

[Paul Cosgrove]

Does anyone know the algorithm used to calculate the RPF interface in 
IOS XR?

It does not appear to select the route with the lowest AD, unlike other 
IOS versions such as 12.0S.   Seems to simply prefer multicast routes 
over unicast routes (e.g. mbgp over unicast bgp) without performing any 
initial AD check.

Thanks,

Paul.
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