One very simple solution would be too ask your providers to include a
default advertisement along with the other routes you're receiving. After
that it's a pretty simple process to prefer one provider's default over the
other by following the example in the book.
HTH,
John
> Hi,
>
> I face this problem when reading Halabi's classic (p.377-382). I also
face such a problem in my supported network.
>
> Router A and B run iBGP in AS1. A runs eBGP with C in AS2. B runs eBGP
with D in AS3.
> I want the A-C path be the primary default and the B-D path be the backup
default.
> (Note this is not exactly the same as Halabi's example)
>
> In Halabi's example, he uses a default route pointing to a network (e.g.
ip route 0.0.0.0 0.0.0.0 193.78.0.0). Then he uses route-map to set
different local_preference based on matching the subnet ip. The point is
this subnet must be advertised inbound from the ISP so that we can apply
inbound route-map.
>
> But my problem is that in reality we usually use static default route
pointing to the ISP's router interface (e.g. ip route 0.0.0.0 0.0.0.0
193.78.1.1). This route is statically entered but not learnt dynamically.
Then how can I set local_pref to this default route ? How can I advertise
this route message to the iBGP peer ? I have thought of redistributing
static route but it doesn't really make sense and seems too complex.
>
> I believe you may also have experienced such a setup. What's the more
practical solution ? Thank you in advance.
>
>
> Cheers,
> YY
>
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