[c-nsp] IOS XR and router rib rump always-replicate

[John Neiberger]

Thanks, Oliver! That explains exactly what we were seeing. We doing have a
multicast AF enabled in our IGP on the affected routers, so now I
understand why we needed the additional replication commands.

Thanks again,
John


On Fri, Mar 1, 2013 at 5:06 AM, Oliver Boehmer (oboehmer) <
oboehmer at cisco.com> wrote:

>
>
> On 01/03/2013 10:58, "Mikael Abrahamsson" <swmike at swm.pp.se> wrote:
>
> >On Fri, 1 Mar 2013, Christian Meutes wrote:
> >
> >> On 01.03.2013, at 10:01, Mikael Abrahamsson <swmike at swm.pp.se> wrote:
> >>
> >>> On Fri, 1 Mar 2013, Christian Meutes
> >>> Do you have your sources addresses in IGP?
> >>
> >> Nope, BGP SAFI unicast.
> >
> >Well, your experience contradicts mine. I have had to solve issues with
> >multicast not working and started working when the sources were put in
> >SAFI multicast with as late software as XR 4.2.1.
> >
> >I'll defer to someone more knowledgable to explain how this really works.
>
> Once you enable the mcast AF in your IGP or BGP, IOS-XR will populate the
> muRIB, and PIM will use this one for RPF (before it used the unicast
> RIB/uRIB). This requires that all sources will be in the muRIB. This is
> different from IOS where RPF would fall back to the unicast RIB, as
> Michael described.
>
> The "rump always-replicate" command will replicate uRIB to muRIB, so we
> effectively achieve the IOS behaviour.
>
>         oli
>
>
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