[j-nsp] L3VPN advertises the directly connected subnet - why?

[Sean Clarke]

Have you got vrf-table-label configured ?



On 1/26/10 4:51 PM, Jeroen Valcke wrote:
> Hi,
>
> I'm doing some testing with simple plain L3VPNs and ran into some weird
> behaviour. At least I think it's weird. Perhaps somebody can enlighten me.
>
> A CE router is exchanging routes with the PE through BGP. These routes
> are correctly advertised 'over' the L3VPN towards other CE routers.
> However the directly connected subnet between the CE and PE is also
> advertised to the other CE routers.
>
> Why is this? It was my understanding that only the routes learned from
> the BGP advertisement from the CE router would be advertised to the
> other CE routers.
>
> What's the reasoning behind this behaviour?
> Can I alter this behaviour? And if yes, is it safe to do so?
>
> Weirdly enough I've found a Juniper KB [1] which seems to document the
> exact opposite behaviour of what I'm experiencing. This KB describes a
> case where the directly connected subnet is not advertised over the
> L3VPN and how to 'fix' this.
>
> Thanks for any clues.
> Kind regards,
> -Jeroen-
>
> PS: JunOS version on the PE routers is 9.3R2.8
>
> [1] http://kb.juniper.net/index?page=content&id=KB12430&cat=BGP&actp=LIST
>
>    


-- 
Sean Clarke
Gerard Brandtstraat 29
2332AK Leiden
The Netherlands
+31 614 261 198