[j-nsp] Default route origination for Ibgp

[George Hong]

Yeah, I've changed it to EBGP now, that makes things easier and solved
most of the issues.
The only thing is that the deafult route on the firewall now has an
ASPATH of "2914 $myas" , Ideally that would just say $myas
I realize that's just a cosmetic thing... but it annoys me :)

On Tue, Oct 1, 2013 at 10:17 AM, Phil Fagan <philfagan at gmail.com> wrote:
> 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