To configure syslog on a Cisco device you need to use the following commands:

R1(config)#logging <server IP>
R1(config)#logging trap <level of logging trap>
R1(config)#logging source-interface <source int>
R1(config)#logging on
R1(config)#logging origin-id <IP>, <hostname>, <string> (optional if you have more than one device on one syslog server)