Re: MPLS Hub and Spoke

Routes are imported into the VRF tables based on route-targets theu
carry. Imported routes do not become part of that VRF in a sense that
they get new RT attached. They are also not exported from VRF. So,
once the hub learns the route from a spoke, it will not import it to
the VRF, export it out and advertise to another spoke.

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On Fri, Mar 19, 2010 at 20:03, Muzammil Malick <malickmuz_at_gmail.com> wrote:
> Hi
>
> If I have 2 Spoke VRFs peering via eBGP peers to CE and then I create a hub
> VRF to import and export to these spoke VRFs why do
> the spokes not learn about each others routes?
> Surely if the hub is learning routes from both vrf's then when it exports it
> will send these routes to
> each of the spokes. If I introduce a route into the hub VRF this
> is propagated to the spokes.
>
>
> ip vrf hub
> B rd 64700:1
> B route-target export 1:100
> B route-target export 2:100
> B route-target import 1:100
> B route-target import 2:100
> !
> ip vrf spoke1
> B rd 64700:2
> B route-target export 1:100
> B route-target import 1:100
> !
> ip vrf spoke2
> rd 64700:3
> B route-target export 2:100
> B route-target import 2:100
>
> Just to let you know , I am aware of exactly how to provide spoke to spoke
> connectivity through the hub but I do not understand
> why the above case does not work.
> I am obviously missing something in my understanding.
> Any help is appreciated.
>
>
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