As part of an upgrade to SEP v12 we will be updating the GUPs on sites from v11 to v12 before upgrading clients from v11 to v12. We intend to leave a 48 hrs period from updating the GUP before starting client upgrades, the purpose of this is to check that the GUP is receiving its updates. During this period will the v11 clients continue to receive updates?
Yes,
SEPM 12.1 Can be manage SEP 11 Client.
Check this thread
https://www-secure.symantec.com/connect/forums/gup-sep12
Hi,
Q. We intend to leave a 48 hrs period from updating the GUP before starting client upgrades, the purpose of this is to check that the GUP is receiving its updates. During this period will the v11 clients continue to receive updates?
--> SEPM 12.1 can manage SEP 11 clients.
I think this might be what you're looking for. The below article confirms 12.1 GUPs can update v11 clients:
http://www.symantec.com/docs/TECH162730
As others have mentioned, a 12.1 SEPM can also manage v11 clients