Netweaver gateway in three tier landscape

Hi experts,
Can You please explain what are the best practices when using SAP Netweaver gateway central HUB deployment in three tier landscape. Is it sufficient/possible to use one gateway system for all (DEV, QAS PRD) systems, or there is a must that every backend system has its own dedicated gateway system?
Thank You and best regards,
Igor

Hi Igor,
I would not support having one gateway system for all three (not even two) landscapes.
For each landscape, it is a standard to have their of set of systems. Rather, any kind of communication between cross landscape systems is usually strictly prohibited.
Still, let us think on what might be the consequences.
Each service will have three system aliases one each for each of Dev, QA and Prod.
What if a production service by mistake starts pointing to a Dev's system alias and starts showing products from Dev landscape? disastrous for the company!!!
If you are worried about having to maintain one extra system for Gateway you can consider 'Embedded Deployment', which I have seen many clients have adopted successfully. (be aware of limitations though)
regards
Krishna

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