Sending only default route to downstream users?

[Olda Plchot]

Hi,
  if you are receiving the full BGP table, you might not have default
routes (0.0.0.0/0 and ::/0) at all. You can although create them statically
to propagate them further.

protocol static  {
        route 0.0.0.0/0 blackhole;
}

or for IPv6

protocol static  {
        route ::/0 reject;
}

then you will be able to pass these routes further down.

Cheers,
         Olda

On Fri, Mar 24, 2017 at 3:24 PM, Mike Jones <mike at mikejones.in> wrote:

> On 24 March 2017 at 13:37, Michael McConnell <michael at winkstreaming.com>
> wrote:
> >
> > Hello all,
> >
> > I receive a full iBGP table from my uplinks, however I want to just pass
> a default route / partial table to my downstream clients.
> >
> > I’ve tried various options such as gateway direct and multihop, try to
> turn it into a eBGP situation with no luck.
> >
> > Can anyone point me in the right direction?
> >
> > Thank you very much for your time and help,
> > Mike
> >
>
> Hi,
>
> You are looking for filters. These define rules that get checked
> against every route imported/exported and can either accept/reject a
> route or can even modify attributes. Filters can be applied on export
> to control what you advertise, and on import to control what you
> accept.
>
> I would normally leave you to figure out the details by yourself,
> however the documentation isn't exactly the best at telling you how to
> do these simple tasks so it would probably save a bit of time if I
> gave you an example.
>
> filter senddefault {
>         if net = 0.0.0.0/0 then accept;
>         reject;
> };
>
> and the v6 version would be
>
> filter senddefault {
>         if net = ::0/0 then accept;
>         reject;
> };
>
> - Mike Jones
>
>
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