You should be able to configure flexible netflow on the device.
There are 3 elements to configuring flexible netflow, the flow record, flow monitor and if you want to use the data with an external program/server/etc the flow exporter.
Here is what we typically use for our basic netflow configuration:
flow record FLOW-RECORD
match ipv4 source address
match ipv4 destination address
match transport source-port
match transport destination-port
collect counter bytes long
collect counter packets long
!
flow exporter FLOW-EXPORT
destination <IP Address>
source <VLAN #>
transport udp <port #>
!
flow monitor FLOW-MON
cache timeout inactive 300
record FLOW-RECORD
exporter FLOW-EXPORT
!
sampler SAMPLER
mode random 1 out-of 32
!
!
interface GigabitEthernet1/0/1
ip flow monitor FLOW-MON sampler SAMPLER input
On a router ip flow monitor FLOW-MON input & ip flow monitor FLOW-MON output might work instead.
!
This should give you a basic working netflow configuration and to view the data use the following show commands:
sho flow monitor FLOW-MON cache sort highest counter bytes long top 10
sho flow monitor FLOW-MON cache aggregate ipv4 source address sort highest counter bytes long top 10
sho flow monitor FLOW-MON cache aggregate ipv4 destination address sort highest counter bytes long top 10
Hopefully this gets you started with flexible netflow but if you need more in depth information on it check out this document:
https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3850/software/release/3se/flexible_netflow/configuration_guide/b_fnf_3se_3850_cg/b_fnf_3se_3850_cg_chapter_010.html#concept_A4AB227AC35840A1ACE51453EDBACD3E
