Re: Top 50 unstable DVMRP routes

[Dino Farinacci <]

>>   Configuring the DVMRP distance high is sufficient to prevent the
>> route instability problem, you're right.  However, if you don't use the
>> A<B<C solution as described on the web page, you will create black
>> holes.  I don't want to trade one problem for another, which is why the
>> web page suggests the A<B<C configuration which solves both.  The set
>> of routes requiring the C distance could be empty, of course, and in
>> that case it reduces to the solution you were suggesting.

    The distance C introduces a problem. What if there is a DVMRP route that
    covers one of the unicast routes your not advertising into DVMRP. Then
    a multicast packet from a local source will RPF to the DVMRP route and
    not get forwarded to local members.

    You should only use 2 distances in my opinion.

Dino