Firstly - it doesn't look like Active Directory Authentication is supported (only community or USM is available) - some interesting reading on USM in RFC 3414 http://www.rfc-base.org/txt/rfc-3414.txt
CLUSTER01::> security login create -username domain\svc_monitoring -application snmp -authmethod domain -role readonly -vserver CLUSTER01 -comment "SNMP User for monitoring" Error: snmp: cannot use domain to authenticate
So a local user needs to be created.
CLUSTER01::> security login create -username svc_monitoring -application snmp -authmethod usm -role readonly -vserver CLUSTER01 -comment "SNMP User for monitoring" Enter the authoritative entity's EngineID [local EngineID]: Which authentication protocol do you want to choose (none, md5, sha) [none]: md5 Enter the authentication protocol password (minimum 8 characters long): Enter the authentication protocol password again: Which privacy protocol do you want to choose (none, des) [none]:
This should be all that is required from the NetApp end, then you can run through and configure your filer