sync CVS repository

[Acconci Lucia]

Hi list,
I need to know if there is a tool to align two CVS repository synchronously. 
The two repositories (v. 1.11.22) are  installed on separate servers AIX and is 
not guaranteed HA of network.  Do you have experience on real cases  for 
keeping them aligned?
 
Thanks in advance.
Regards,
 
Lucia Acconci