[j-nsp] Default route origination for Ibgp

[George Hong]

Hi Juniper Guru's.

I Have a question regarding the best way to generate a default route in BGP.

The topology is as below. Rtr1 and rtr2 both have a full EBGP feed
from different providers (incl Default route)
rtr1 and rtr2 have an IBGP session and exchange full tables.
There's also IBGP sessions between:
rtr1- fw1
rtr1- fw2
rtr2- fw1
rtr2- fw2

On these sessions we only announce a default route from the routers to
Firewalls.


--------        -------
| rtr1 |       | rtr2 |
--------       --------


--------        -------
| fw1 |       | fw2 |
--------       --------

The challenge I have is a good way of originating a default route.
For example rtr1 - fw1 is most preferred path (done using local
prefs). But I'm preferring the ISP on rtr2 (localpref).
as a result rtr1 is not sending the default route to fw1, since its
best route was learned through IBGP from rtr2 (unless I'd set it up as
route-reflector).

Also I don't want the ASpath original ASpath to show up in the
default. It should just be the "I" Locally originated, not the AS of
my provider in there.

I *do* need the default on both routers as well (I have a few remote
sites using same AS, so rely on default to get there, not interested
in allow-as-in etc now).
So I can't put in a static pointing to my iso, cause I want to make
sure it fails over correctly if that connections becomes unavailable.
I'm guessing that also eliminates the " no-install discard " option as
it will over ride the default route I learned from my ISP and/or other
border router.

So, wondering what's the best way to do this? any recommendations?
tips? This is for both IPv4 and IPv6

Thanks,
 George