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Depending on the mixture of operating systems within your environment, this is important to know.
If you are trying to schedule updates to occur only at certain time periods through the day, this can only be achieved by using a Live Update server. Group Update Providers work by requesting definitions from the SEPM directly.
Since differential updates are normally small, in an environment where all the traffic is on the same local LAN as the SEPM, it almost is never beneficial to use GUPs in this scenario.
While some bandwidth could be recovered by putting a GUP on each subnet, the management of a large-scale GUP environment in a local LAN will likely take more time and effort than any nominal bandwidth savings.
If the client is not able to download the definition from the GUP due to the amount of time it takes or if the GUP is unavailable, it will then default to pulling definitions from the SEPM.
This is to insure that definitions are available to the client even if GUPs are unavailable. To understand the bandwidth savings of using a GUP it is important to understand the amount of traffic generated by definitions updates.
If you have an environment where you have a separate Live Update in your environment, the GUPs will not request definitions from this system.
Depending on how clients are chosen to be GUPs, the antivirus team will need to be aware of any system decommissions.
On the next heartbeat interval the client will then download the definition from the GUP.
The GUP technology in SEP allows administrators to designate client systems within the environment to distribute client definitions in a peer fashion.
In an environment where a GUP is configured, clients designated to use GUPs will reach out on port 2967/TCP to see if there is a definition update available.
During this time while they thought a GUP was being used, all clients at this remote site were actually updating definition directly from the SEPM.
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