Can't get either switch to export netflow

[WallaceVanDunk1494]

Hello,

I have 2 layer 3 switches - 3750G and 3750X.  I have been trying to get netflow to export to PRTG network monitor, but it doesn't seem that either switch is exporting any netflow data at all.  Below is what I have tried so far:

flow record NetFlow-To-PRTG

 description Record-Network-Traffic
 match ipv4 tos
 match ipv4 protocol
 match ipv4 source address
 match ipv4 destination address
 match transport source-port
 match transport destination-port

 match transport tcp source-port

 match transport tcp destination-port

 match transport tcp flags

 collect interface input snmp

 collect interface output snmp

 collect transport tcp flags
 collect counter bytes long
 collect counter packets long
 collect timestamp sys-uptime first
 collect timestamp sys-uptime last

flow exporter NetFlow-To-PRTG
 description Export-Flow-to-PRTG
 destination 192.168.x.x

 source vlan5
 transport udp 9997

flow monitor NetFlow-To-PRTG
 description Monitor-PRTG-Flow
 record  NetFlow-To-PRTG
 exporter NetFlow-To-PRTG
 cache timeout active 60

sampler PRTG-Sampler

mode random 1 out-of 32

I've also tried without the sampler.  I have tried removing the above config and just doing "ip flow ingress" and "egress" on a port, with ip flow-export source and export destination global config commands, using port 9991 and also 9997, but the output of the "show ip flow export" command shows nothing.  Route-cache is enabled on interface, cef is enabled globally and I purposely configured it on the interface.  Vlan 5 is my management vlan but I've tried every source I could think of including creating a loopback.  Also it appears that I can only apply the flow monitor on Vlans and not L3 interfaces?  When I try, I get an error that "flexible netflow is not supported on the interface"

Flow export v5 is enabled for main cache
Export source and destination details :
VRF ID : Default
Source(1) 192.168.x.x (Port-channel1)
Destination(1) 192.168.x.x (9991)
Version 5 flow records
0 flows exported in 0 udp datagrams
0 flows failed due to lack of export packet
0 export packets were sent up to process level

I've also tried using version 9 but same result.  As you can see most recently I have the source set as a L3 port channel but I've tried every active interface as the source, all with the same result.

Any help anyone can provide would be greatly appreciated.

[Francesco Molino · Accepted solution]

Hi
For 3750G if I recall, netflow isn't supported.
For 3750X, you can only enable netflow on 1G and 10G service module (physical interfaces not port channel).

[WallaceVanDunk1494]

Curious why the commands would go through if it is not supported but thanks for the info.

[Francesco Molino]

I would answer in a short way that IOS code is shared across platforms and commands go through but you need to refer to documentations or IOS Navigator feature to see what is supported or not and in which condition it's supported.