I have been looking for a way to replicate all servers for a while but it seems that Microsoft doesn't want the KCC to function this way. Repadmin seems to replicate (with /syncall) to only its configured replication partners. Now if you use the /e it will replicate (to the best of my understanding) to domain controllers in other sites if they are configured as a partner. So I found a way to do this using two commands, dsquery.exe and for.exe. Dsquery is a powerful Microsoft tool that's been around for a while and allows for all sorts of functionality in the area of "Directory Services". As a side note you can pipe in other "DS" commands such as dsadd, dsmod, dsmove, dsrm based on the former part of the query.
Anyway, just plug this script into a batch file, replacing SITENAME with the AD site you wish to replicate in and change the path to wherever you run your scripts from.
----------script begin --------------
dsquery server -o rdn -site "SITENAME" >C:\scripts\SITENAMEDCs.txt
For /F "delims=" %%i in (SITENAMEDCs.txt) do repadmin /syncall %%~i
--------script end-------------------
The dsquery command will output the servers in the site one per line, surrounded in quotes. The second line looks at each line in the file and runs the repadmin /syncall command. The ~ in the latter part of the "for" line is used to parse the quotes that dsquery outputs in. Enjoy!
