server-id   = 1
binlog_do_db    = example
log-bin=mysql-bin
replicate-same-server-id = true

slave stop;
CHANGE MASTER TO MASTER_HOST = 'IP_OF_SERVER_B', MASTER_USER = 'replicator', MASTER_PASSWORD = 'password', MASTER_LOG_FILE = 'mysql-bin.0000013', MASTER_LOG_POS = 120;
slave start;

server-id   = 2
binlog_do_db    = example
log-bin=mysql-bin
replicate-same-server-id = true

slave stop;
CHANGE MASTER TO MASTER_HOST = 'IP_OF_SERVER_A', MASTER_USER = 'replicator', MASTER_PASSWORD = 'password', MASTER_LOG_FILE = 'mysql-bin.0000012', MASTER_LOG_POS = 120;
slave start;