Discovery is just that: discovery of resources in the case of system discovery and discovery of forests for forest discovery. System discovery will update existing resources or create new ones if an existing, matching resource cannot be found. That's it. There are no other implications to discovery. If you enable (or have enabled) client push, then that may kick off for new resources. Enabling discovery doesn't change ConfigMgr functionality, it just adds data.
Possible snags in turning on AD discovery in existing production enviroment?
We initially setup our environment to install the client via group policy and created an IP boundary with all IP addresses. Of course, now there is a lot of missing information that would be useful, but SCCM does not grab it.
We have about 7000 machines that have been talking to SCCM for about a year. Do any of you foresee any issues with turning on AD forest and AD system discovery? We cant exactly test this in our lab, and I don't know enough about the system to understand how it would affect what we currently have.
Thanks for your input!
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Like Jason said, if you have enabled automatic site-wide client push installation, it will install client agent on newly discovered computer resources.
This option is in Administrator > Overview > Site Configuration > Sites > choose your site > Client Installation Setting > Client Push Installation Properties.
And in terms of collection, if your query rule used the WMI class like SMS_R_xxx, it will dynamically change based on discovery.
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That'll be based on your collection membership queries. If they are based on discovery data, then it certainly could. Although, if you have membership queries today based on AD system discovery data, then that would be kind of weird IMO.