[j-nsp] Default route origination for Ibgp

[Phil Fagan]

Agree'd might be best to move the 0.0.0.0/0 down into a IGP.

Here is a great example:

http://majornetwork.net/2013/07/originating-default-route-in-ospf-in-junos/




On Mon, Sep 30, 2013 at 5:04 PM, OBrien, Will <ObrienH at missouri.edu> wrote:

> I advertise a default route via an igp. (Ospf) when traffic gets to the
> border routers, the best path is chosen thanks to ibgp between the two
> border routers. I also maintain redundant links between the two border
> routers so that an outage won't matter.
>
> Will O'Brien
>
> On Sep 30, 2013, at 5:52 PM, "George Hong" <georgehong21 at gmail.com> wrote:
>
> > 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
> > _______________________________________________
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>
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-- 
Phil Fagan
Denver, CO
970-480-7618