The Subversion repositories that are installed with TeamForge run on Subversion 1.5, which supports merge tracking.
Any Subversion 1.5 servers you have integrated with TeamForge support merge tracking. If you need the merge tracking feature and your Subversion server is running a version earlier than Subversion 1.5, you must upgrade to Subversion 1.5 to get this functionality.
If you used svnmerge.py (http://www.orcaware.com/svn/wiki/Svnmerge.py) to do merge tracking before Subversion 1.5, and you want to convert your svnmerge.py data to the Subversion 1.5 merge tracking data format, CollabNet provides a migration tool.