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New Member

NetFlow exports on 4500s

Hello,

I have NetFlow configured on 2 different 4500s, with the below hardware:

THATCH_CR451_01#sh mod

Chassis Type : WS-C4510R

Power consumed by backplane : 40 Watts

Mod Ports Card Type Model

---+-----+--------------------------------------+----------

1 2 Supervisor V 1000BaseX (GBIC) WS-X4516

Mod Submodule Model

----+-----------------------+------------

1 Netflow Services Card WS-F4531

running IOS: cat4500-entservices-mz.122-25.SG4.bin

THATCH_CR451_01#sh ip flow export

Flow export v5 is enabled for main cache

Exporting flows to 161.12.20.11 (9991)

Exporting using source interface Loopback0

Version 5 flow records

47178983 flows exported in 1572650 udp datagrams

and....

HORLEY_CC450_01#sh mod

Chassis Type : WS-C4506

Power consumed by backplane : 0 Watts

Mod Ports Card Type Model

---+-----+--------------------------------------+--------------

1 2 Supervisor IV 1000BaseX (GBIC) WS-X4515

Mod Submodule Model

----+-----------------------+------------

1 Netflow Services Card WS-F4531

running IOS: cat4500-entservices-mz.122-25.SG.bin

HORLEY_CC450_01#sh ip flow export

Flow export v5 is enabled for main cache

Exporting flows to 161.12.20.11 (9991)

Exporting using source interface Loopback0

Version 5 flow records

2137814974 flows exported in 71260500 udp datagrams

both have the same config applied:

ip flow-export source Loopback0

ip flow-export version 5

ip flow-export destination 161.12.20.11 9991

There is no option to add the "ip route-cache" line under each layer-3 interface, however HORLEY_CC450_01 is collecting stats, but the THATCH_CC450_01 is not....

Feature navigator states netflow should work on the IOS installed, but is defintely not. I can see flows saying they are being exported, but not collecting within Netflow. Is this a known bug, or is there additional config needed? Any help appreciated.

Thanks

Phil

1 ACCEPTED SOLUTION

Accepted Solutions
New Member

Re: NetFlow exports on 4500s

I found some documentation stating this as well, but I believe it is specific to routers.

I also found this document: http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/12.2/25ew/configuration/guide/nfswitch.html#wp1014923 which explicitly states "Enabling NetFlow on a per interface basis is not supported on a Catalyst 4500 switch."

6 REPLIES
New Member

Re: NetFlow exports on 4500s

Ahoy Phil,

Have you had any success with this? I am experiencing the same issue on cat4000-i5k91s-mz.122-25.EWA14.bin.

Would appreciate any insight, thanks!

-Adam

New Member

Re: NetFlow exports on 4500s

Hello,

No - nothing of note to resolve this problem... I guess its a 'feature' with the cisco code/HW combination....

Rgds

Phil

Re: NetFlow exports on 4500s

in some recent IOS releases Cisco Express Forwarding has to be enabled. make sure you've issued the ip cef command in global config mode

New Member

Re: NetFlow exports on 4500s

If only it was that easy... CEF configured on all 4500s already....

New Member

Re: NetFlow exports on 4500s

I found some documentation stating this as well, but I believe it is specific to routers.

I also found this document: http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/12.2/25ew/configuration/guide/nfswitch.html#wp1014923 which explicitly states "Enabling NetFlow on a per interface basis is not supported on a Catalyst 4500 switch."

New Member

Re: NetFlow exports on 4500s

Adam,

"ip flow ingress infer-fields" in global config command enabled netflow for me....

thanks for your help!... be warned though, when entering the command your session freezes for a short period, so be careful if adding on a live network in the middle of the day (just in case it does have an impact)!

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