BGP route back

[Roman Romanyak]

Thank you for the advise, Ondrej. I've heard that some l3 switches do not
support add-path feature in VRFs, but in this case I'm using routers, so
this should work fine.


-
Roman.



On Tue, Jan 22, 2019 at 9:38 AM Ondrej Zajicek <santiago at crfreenet.org>
wrote:

> On Fri, Jan 18, 2019 at 01:14:47PM -0500, Roman Romanyak wrote:
> > Hello Bird users,
> >
> > Does anyone know if there is a way to announce a BGP route back to the
> > router it was received from.
> > I need to do this for the following scenario.
>
> Hi
>
> I recently thought about a setup where a route-reflector modifies routes
> and propagates modified routes to its clients. To avoid issue with
> announcing route back and with (like you noticed) and with withdrawing
> original route (like Alexander Zubkov noticed) there is a simple solution:
>
> Use two RIB routing tables on clients and two single-directional BGP
> sessions - first RIB table collects routes from EBGP peers and uses first
> BGP session to propagate that to route-reflector, then second BGP session
> is used to propagate all routes back from route-reflector to second table
> in clients, while second table is connected to kernel/FIB.
>
> Such setup could be done in BIRD, i am just wondering whether client part
> of such setup could be done with common L3 switches with BGP support.
>
> --
> Elen sila lumenn' omentielvo
>
> Ondrej 'Santiago' Zajicek (email: santiago at crfreenet.org)
> OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net)
> "To err is human -- to blame it on a computer is even more so."
>
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