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

[Arie Vayner]

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/
>