[j-nsp] ISIS route leaking from Level2 to Level1

[Cydon Satyr]

Thanks!

I was under the impression that, when you export an external route (OSPF)
into level 1 only (to level 1) on L1/2 routers - this route will not be
installed back into these routers - a sort of failsafe mechanism in ISIS
for routes which do not have up/down bit set. But it looks like this is
only when this same route is advertised to BOTH level1 and level2.

Setting up/down bit manually does make it easier...


On Fri, Nov 18, 2016 at 2:13 PM, Krzysztof Szarkowicz <kszarkowicz at gmail.com
> wrote:

> Hi Cydon,
>
> setting down bit will be supported from 16.2 with ‘then color2 1’
>
>
> Best regards,
> Krzysztof
>
>
>
>
> > On 2016-Nov-18, at 14:08, Cydon Satyr <cydonsatyr at gmail.com> wrote:
> >
> > Hi Krasimir,
> >
> > I'm aware that would work. Also, if aggregate is redistributed to level 2
> > as well (not just level 1), the originating router will not install this
> > route into RIB - but I was sure this behavior would work if route is
> > distributed into level 1 only as well.
> >
> >
> > On Fri, Nov 18, 2016 at 1:48 PM, Krasimir Avramski <krasi at smartcom.bg>
> > wrote:
> >
> >> Hi Cydon,
> >>
> >> Lower the aggregatde route preference below 18.
> >>
> >>
> >> Best Regards,
> >> Krasi
> >>
> >> On 18 November 2016 at 13:11, Cydon Satyr <cydonsatyr at gmail.com> wrote:
> >>
> >>> Hello experts,
> >>>
> >>> If I create an aggregate route on L1/2 router and export it to Level1
> ("to
> >>> level 1"), this route does not have up/down bit set, making it eligible
> >>> for
> >>> leaking back to Level 2.
> >>> What happens is that now router which originated aggregated route
> prefers
> >>> same route over ISIS making a constant oscillation.
> >>>
> >>> Is there a way to prevent this?
> >>>
> >>>
> >>> Thanks
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> >>>
> >>
> >>
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