Netflow on interfaces trunk of a 6500

Answered Question
Apr 16th, 2010

Hello,

is possible configuring netflow on interfaces trunk?

thanks in advanced.

I have this problem too.
0 votes
Correct Answer by Jan Nejman about 6 years 9 months ago

Hello,

  really on L2 etherchannel or on 802.1q trunk you cannot configure NetFlow,

but flows that are going throught etherchannel or trunk ar counted via "mls".

MLS works globally, it includes all L2 interfaces. This includes all trunks

and etherchannels. In the netflow export you will see source/destination VLAN

for L2 ports. You will see physical interfaces for L3 ports (i.e Gigabit1/3).

It is not possible to find a physical port for L2 data flow. So you

cannot identify if flow is comming from ehterchannel, you will see that a

flow income from VLAN 3 and going to VLAN 5.

You can configure "ip flow ingress" or "ip route-cache flow" commands on

L3 etherchannel.

In other words: For proper configuration use "ip flow ingress" on all L3 ports

(show ip interfaces brief | excl unassigned)

and also configure mls (see the url that I sent you in the last entry).

Sorry for my English. I hope that my comment is comprehensible.

Kind regards,

Jan Nejman

Caligare, co.

http://www.caligare.com/

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Jan Nejman Fri, 04/16/2010 - 05:20

Hello,

  you need to configure a flow only for L3 interfaces. For L2 interfaces, please,

configure mls flow ... You can also enable intra-vlan traffic.

See http://support.caligare.com/kb/entry/43/

to get more information accounting intra vlan traffic.

For getting information from trunk ports, see

http://netflow.caligare.com/configuration_native.htm

for more information about 'mls' configuration.

Please, feel free to contact me if you have more questions.

Kind regards,

Jan Nejman

Caligare, co.

http://www.caligare.com/

jimontoro Fri, 04/16/2010 - 10:19

Hello Jan,

thank you very much for the response, but I read in other sites that is not possible configure netflow on interfaces trunk or etherchannel, is this possible??

Correct Answer
Jan Nejman Mon, 04/19/2010 - 08:26

Hello,

  really on L2 etherchannel or on 802.1q trunk you cannot configure NetFlow,

but flows that are going throught etherchannel or trunk ar counted via "mls".

MLS works globally, it includes all L2 interfaces. This includes all trunks

and etherchannels. In the netflow export you will see source/destination VLAN

for L2 ports. You will see physical interfaces for L3 ports (i.e Gigabit1/3).

It is not possible to find a physical port for L2 data flow. So you

cannot identify if flow is comming from ehterchannel, you will see that a

flow income from VLAN 3 and going to VLAN 5.

You can configure "ip flow ingress" or "ip route-cache flow" commands on

L3 etherchannel.

In other words: For proper configuration use "ip flow ingress" on all L3 ports

(show ip interfaces brief | excl unassigned)

and also configure mls (see the url that I sent you in the last entry).

Sorry for my English. I hope that my comment is comprehensible.

Kind regards,

Jan Nejman

Caligare, co.

http://www.caligare.com/

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