SCCM Software Update Deployment flow
The SCCM clients receive their SUP/WSUS settings as a local policy on the clients, Scan gets initiated as per configured schedule and happens on base of update GUID. Location services looks for our nearest SUP. This also can be checked in windowsupdate.log When scan is completed. ScanAgent reports that the scan is complete and records the results of the scan in the updatestore. Information can be checked in updatestore.log Client sends result of scan cycle through status massages with topic ID 501 and 500 to MP and site server for each the update that are missing on machine. This can be checked in statemassage.log Once all this process completes updates evaluation gets start by receiving policy for applicable updates. Scan gets initiated for to have latest scan data update applicability and report status, This information can be checked in updatedeployment.log Client Retrieve needed update components through CIAssignment and then SDM agent checks what binaries ar