You can set security parameters when you create a route with create route.
create route to dest_replication_server {
...
[set username to 'user' ]
[set password to 'passwd' ]
[set security_mechanism to 'mechanism_name' |
set security_parameter to { 'required' |
'not_required' } ]
The parameters are stored in the rs_config table in the RSSD. You must have sa permission to execute them.
Security parameters set at both ends of a route must be compatible.