netflow not working in 9400 in stack virtual

[Julio Padilla Cruz]

hello everyone. hope you are doing well. i have a question regarding netflow not working on a 9500 catalyst connected to another 9500 via stackwise virtual and for some reason, it's sending 0's when capturing data on wireshark. any help on this matter will be appreciate. here is a screenshot from the event

[balaji.bandi]

what version code running, how is your configuration look like ?

https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9400/software/release/17-3/configuration_guide/nmgmt/b_173_nmgmt_9400_cg/configuring_flexible_netflow.html

I have tested several SVL and works as expected

https://www.balajibandi.com/?p=1383

[Julio Padilla Cruz]

hello Balaji. thanks for the quick response. this is the code a have configured. it will be in attachment. for some reason, this is giving an error when i try to write it down

[balaji.bandi]

Not i have tried the loopback does the traffic transit via loopback ? try change this to Data interface like SVI or Ethernet interface and check.

source $LOOPBACK_IFNAME

Also can you post the config of  -

show run Int TenGigabitEthernet1/1/0/18

[Julio Padilla Cruz]

Yeah. It works with the loopback with no issues. Remember, the loopback interface never goes down so, thats why is used as a source even for management purposes as well. if the VLAN goes down, it would not send information to the netflow server. here is the configuration on that interface

interface TenGigabitEthernet1/1/0/18
switchport trunk native vlan 42
switchport trunk allowed vlan 42,2242
switchport mode trunk
ip flow monitor NFAMonitorinput input
ip flow monitor NFAMonitoroutput output

also, tried using the VLAN as a source but no luck. it keeps sending 0's. 

now, the interesting thing about this is that when i configured the virtual stackwise, it added another digit i should say to the interface. i dont know if thats the reason its not sending the information back to the netflow server. i have a 9500 which is running normal stack with the stack cables and i dont have any issues with that one. 

before 

interface TenGigabitEthernet1/0/18

after

interface TenGigabitEthernet1/1/0/18