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

[Gert Doering]

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
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