[c-nsp] Best Practices to make one BGP link prefer for egrees and ingress traffic of one subnet

[Saku Ytti]

I misread what you mean by:

---
> We are planning for SDWAN but in 3rd quarter of this year. But before this
> we need something to work.
----

You need something, to fix what? If you have a solution and you have a
future solution, I'm at a loss what needs to be addressed meow.

On Mon, 23 Feb 2026 at 21:45, Muhammad Atif Jauhar
<atif.jauhar at gmail.com> wrote:
>
> Hi,
>
> I am not facing any problem just need advice for best approach for my scenario.
>
> Regards,
>
> Muhammad Atif Jauhar
> (+966-5600-04985)
>
> On Mon, Feb 23, 2026, 21:57 Saku Ytti <saku at ytti.fi> wrote:
>>
>> But you stated you already have a working PBR solution.
>>
>> What acute problems are you trying to solve?
>>
>> Like one option could be that you use VRF, where you have Transit1,
>> Transit2 VRF.
>> Then you have Edge1 and Edge2 VRF.
>>
>> On Edge1 VRF import you prefer Transit1
>> On Edge2 VRF import you prefer Transit2
>>
>> Then you put 1/24, 2/24 on Edge1 and 3/24 on Edge2.
>>
>> But all this of course largely hinges on what actual problems you have
>> with your current PBR setup.
>>
>> On Mon, 23 Feb 2026 at 20:31, Muhammad Atif Jauhar via cisco-nsp
>> <cisco-nsp at puck.nether.net> wrote:
>> >
>> > Thanks Arie،
>> >
>> > We are planning for SDWAN but in 3rd quarter of this year. But before this
>> > we need something to work.
>> >
>> > Regards,
>> >
>> > Muhammad Atif Jauhar
>> > (+966-5600-04985)
>> >
>> > On Mon, Feb 23, 2026, 20:08 Arie Vayner <ariev at vayner.net> wrote:
>> >
>> > > Muhammad,
>> > >
>> > > As you mention specific destinations that you seem to own/manage on both
>> > > ends, wouldn't it make more sense to run some overlay here, with tunnels
>> > > taking all available paths, and some simple SD-WAN-like routing policies
>> > > selecting the correct overlay for the relevant traffic?
>> > >
>> > > Tnx
>> > > Arie
>> > >
>> > > On Mon, Feb 23, 2026, 8:03 AM Muhammad Atif Jauhar <atif.jauhar at gmail.com>
>> > > wrote:
>> > >
>> > >> Hi,
>> > >> Thank you both for your feedback.
>> > >>
>> > >> Basically, one subnet is for backup environment and other link is for
>> > >> normal user traffic toward Data center.
>> > >>
>> > >> If we use one link most of the bandwidth captured by backup to avoid any
>> > >> bandwidth issue and slowness faced by users, we acquired one link for only
>> > >> backup and replication.
>> > >>
>> > >> Now want to segregate traffic on both link to avoid any bandwidth issue.
>> > >>
>> > >> Regards,
>> > >>
>> > >> Muhammad Atif Jauhar
>> > >> (+966-5600-04985)
>> > >>
>> > >> On Mon, Feb 23, 2026, 17:36 Arie Vayner <ariev at vayner.net> wrote:
>> > >>
>> > >>> Muhammad,
>> > >>>
>> > >>> To add to Gert's comment about symmetry... Can you please try and
>> > >>> explain why you have that requirement?
>> > >>>
>> > >>> I think this may be a case of reassessing the requirements before going
>> > >>> into solution mode.
>> > >>>
>> > >>> Tnx,
>> > >>> Arie
>> > >>>
>> > >>> On Mon, Feb 23, 2026, 5:36 AM Gert Doering via cisco-nsp <
>> > >>> cisco-nsp at puck.nether.net> wrote:
>> > >>>
>> > >>>> Hi,
>> > >>>>
>> > >>>> On Mon, Feb 23, 2026 at 02:50:55PM +0300, Muhammad Atif Jauhar via
>> > >>>> cisco-nsp wrote:
>> > >>>> > However, for outbound traffic, we are presently relying on
>> > >>>> Policy-Based
>> > >>>> > Routing (PBR) to steer traffic via the preferred uplink. While this
>> > >>>> > approach is functional, we would prefer to achieve the desired path
>> > >>>> > selection using BGP-native mechanisms, if possible, to ensure better
>> > >>>> > scalability and operational simplicity.
>> > >>>>
>> > >>>> There is none.  BGP does not care about packet source addresses.
>> > >>>>
>> > >>>> (That said, you could trick around with VRFs, but it's questionable
>> > >>>> if that will be more satisfactory in the end)
>> > >>>>
>> > >>>> Symmetric traffic is an illusion, and trying to achieve that in
>> > >>>> "the Internet" is time not spent well.
>> > >>>>
>> > >>>> gert
>> > >>>> --
>> > >>>> "If was one thing all people took for granted, was conviction that if
>> > >>>> you
>> > >>>>  feed honest figures into a computer, honest figures come out. Never
>> > >>>> doubted
>> > >>>>  it myself till I met a computer with a sense of humor."
>> > >>>>                              Robert A. Heinlein, The Moon is a Harsh
>> > >>>> Mistress
>> > >>>>
>> > >>>> Gert Doering - Munich, Germany
>> > >>>> gert at greenie.muc.de
>> > >>>> _______________________________________________
>> > >>>> cisco-nsp mailing list  cisco-nsp at puck.nether.net
>> > >>>> https://puck.nether.net/mailman/listinfo/cisco-nsp
>> > >>>> archive at http://puck.nether.net/pipermail/cisco-nsp/
>> > >>>>
>> > >>>
>> > _______________________________________________
>> > cisco-nsp mailing list  cisco-nsp at puck.nether.net
>> > https://puck.nether.net/mailman/listinfo/cisco-nsp
>> > archive at http://puck.nether.net/pipermail/cisco-nsp/
>>
>>
>>
>> --
>>   ++ytti



-- 
  ++ytti