Migrate Oracle Enterprise Manager 13.2/SuSe 11 to Oracle Enterprise Manager 13.4/ SuSe12

We want to migrate from Oracle Enterprise Manager 13.2 running on server with OS SuSe 11 to Oracle Enterprise Manager 13.4, SuSe12 Server.

Current environment:

Oracle Enterprise Manager: 13.2.0.0.0.

Database for Repository : 12.1.0.2

Agents :13.2.0.0.0 

Linux: SuSe 11.4 (64 Bit)

Future environment.

Oracle Enterprise Manager: 13.4.0.0.0.

Database for Repository : 12.1.0.2

Agents :13.2.0.0.0 

Linux: SuSe 12.5 (64 Bit)

So we are preparing migration to different SuSe 12 server and want repository data as well as keeping agent data loss to minimum. 

Please provide path, best practices or possible ways to migrate to new server.

Regards,

Moniem