547a61d4_tware_Releases_12_4_T____Cisco__Key_or_Nonkey_Field
[Field] IP Source autonomous system [Definition] Autonomous system of the source IP address (peer or origin). [Key or Nonkey Field] 
Key
K e y
N o n k e y
Flexible Netflow Configuration Guide, Cisco IOS Release 12.4T - Configuring Cisco IOS Flexible NetFlow with Predefined Records [Cisco IOS Software Releases 12.4 T] - Cisco