[c-nsp] route-target import on non-leaking PEs

[Andriy Bilous]

Defaults are initiated on RRs and thus locally originated route always win.


On Thu, Dec 13, 2012 at 4:19 PM, Christian Meutes <christian at errxtx.net>wrote:

> You need add-path on both sides, yes. But as Phil already noted your RRs
> are definitely tie-breaking to different pathes.
>
> On 13.12.2012, at 22:12, Phil Mayers <p.mayers at imperial.ac.uk> wrote:
>
> > On 13/12/12 15:04, Jason Lixfeld wrote:
> >>
> >> On 2012-12-13, at 9:56 AM, Phil Mayers <p.mayers at imperial.ac.uk>
> >> wrote:
> >>
> >>> On 13/12/12 14:47, Jason Lixfeld wrote:
> >>>>>
> >>>>> Yes. In fact, that's *required* if you want to do multi-path.
> >>>>
> >>>> I seem to do multi-path just fine with maximum-paths ibgp 2 on my
> >>>> RR clients inside a VRF that sees a default sourced from two
> >>>> different RRs.  Said VRF has a common RD between the two PEs.
> >>>>
> >>>> How is that different?
> >>>
> >>> Well, AIUI multipath *ought* to require unique RDs. Obviously not;
> >>> I wonder how that's working for you?
> >>
> >> So based on the link you posted previously, which I am currently
> >> making my way through, what's happening is on my production network
> >> where this multi-path stuff is actually working, I'm using XR as my
> >> RRs, which has add-path support.
> >
> > Presumably the RR clients have add-path too (it's needed at both ends)?
> >
> > Other explanations might be that by chance one RR had advertised one
> path and the other RR another path.
> >
> > But yes, my original email should have been more specific: unless you
> have add-paths, unique RD is required for multipath.
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