Hello,
The Article provided TECH104779, is expired and no longer available.
SEPM 12 clients do update the SEP 11 clients.
SEPMs running SEP 12.1 automatically include the latest definitions when creating a client package.
Here are few Articles which may assist you:
How to update virus definitions and other content with Symantec Endpoint Protection and Symantec Network Access Control
http://www.symantec.com/docs/TECH102467
How to update definitions for Symantec Endpoint Protection using the Intelligent Updater
http://www.symantec.com/docs/TECH102606
How to manually update definitions for a managed Symantec Endpoint Protection Client using the .jdb file
http://www.symantec.com/docs/TECH104363
How to update definitions for Symantec Endpoint Protection Manager (SEPM) using a .jdb file
http://www.symantec.com/docs/TECH102607
Hope that helps!!