Nothing needs to be done. RME will listen for syslog messages by default. The messages will be written into NMSROOT\log\syslog.log on Windows. From there, they will be filtered, and inserted into the RME database so that you can run reports.
The RME was installed 3 mounth ago and the NMSROOT\log\syslog.log has 3 Gb of data but when i run the reports, they always are empty. i dont know if there's some filted enabled.
This looks okay. Note, that section of the RME Homepage only tracks the most severe messages. I don't know what the c6k filter is, but I'm betting you don't have any S0, S1, or S2 messages. Instead, go to RME > Reports > Report Generator, and run a syslog standard report for all of your devices. What do you get? How is the c6k filter defined? What messages do you see in syslog.log?
this is de filter c6k. As you can see it can't be blocking the syslog messages, and when i run all kind of syslog reports i always get the same, empty reports with 0 records. When i tried to open the syslog.log i couldn't open it because it's too big. It's 3 GB of size
Okay, this is wrong. I think what you really want is:
Facility : *
Severity : *
Mnemonic : *
Description : *
Try modifying your filter, then send some more syslogs, and they should show up in your reports.