topic Re: Multi site SDA transit and internet access in Software-Defined Access (SD-Access)

Multi site SDA transit and internet access

KevinR99 — Tue, 29 Jul 2025 10:28:32 GMT

We have 2 SDA fabrics. Site A and site B. Site A provides internet access for both sites at the moment. We want to introduce a second internet pipe and site B solely for that site. However, we want site A to provide fallback internet access should site B's pipe fail.

We have an SDA transit between the sites.

So the problem is, in short, each site must use its own internet pipe but site B must be able to use site A's in a failure scenario. We have no need for Site A to ever use site B's internet pipe. All I can imagine is it has something to do with Border priority and/or affinity but I have never used these parameters before.

Thanks as always, Kev.

Re: Multi site SDA transit and internet access

jedolphi — Tue, 29 Jul 2025 11:36:45 GMT

Hi Kev, if it's Pub/Sub SDA Transit then local internet is always preferred over remote internet, so it should 'just work'. Please see Cisco Live presentation BRKENS-2816 for detailed explanation.

Re: Multi site SDA transit and internet access

KevinR99 — Tue, 29 Jul 2025 12:03:57 GMT

Thank you Jerome. I kind of thought that might be the case but thanks for the confirmation.