Hello,
when you issue the command 'setup' from the router prompt:
Router#setup
you are entering the System Configuration Dialog. One of the steps (Step 8) is to configure SNMP Network Management:
Configure SNMP Network Management? [no]: yes
The default is no. Turn it on by setting it to 'yes'.
http://www.cisco.com/c/en/us/td/docs/routers/asr1000/install/guide/1001-x/asr1hig/asr1pwrup.html#pgfId-1107823