Monitoring each port of a NM-ESW-16 with Netflow

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Sep 12th, 2007
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How can I monitor each port of an EtherSwitch?

I've already tried but, i have no result:

I've configured all ports into a VLAN1.

I've configured an IP Address for the card : Vlan1

So all PC or router connected in the EtherSwitch are in a same VLAN / LAN.

But when I monitor the router with the Netflow Analyzer, I cannot see the 16 ports of the EtherSwitch.

I just see the interface Vlan1.

But I want to monitor each port of the EtherSwitch.

Can you help me?

Many Thanks

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Overall Rating: 5 (1 ratings)
Jan Nejman Wed, 09/12/2007 - 10:24
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Please, which box do you using and which version, CatOS, IOS or Native IOS? Could you send me your netflow configuration? Did you also configure mls nde? Did you configure layer2-switched accounting?

For IOSes try the command:

ip flow ingress layer2-switched vlan

ip flow export layer2-switched vlan

However, from the IOS guide: A PFC3B or PFC3BXL running 12.2(18)SXE or higher is required for this command, which enables NDE for all traffic within the specified VLANs rather than just inter-VLAN traffic.

If you are using a CatOS you may use the following command:

set mls bridged-flow-statistics enable

Kind regards


connect101 Wed, 09/12/2007 - 22:55
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Thanks for the reply.

I'm using a 3825 with an IOS c3825-advipservicesk9-mz.124-11.T2

This is my Netflow configuration i've put into the router :



ip flow-cache entries 9996

ip flow-export source Vlan2

ip flow-export version 5

ip flow-export destination 9996

!! is the PC monitor.


I cannot put the "ip route-cache flow" command

into each port of the EtherSwitch.

I've tried your solution, but ios have not this command :

ip flow ingress layer2-switched

The following are possible on with this IOS

ip flow-aggregation

ip flow-cache

ip flow-capture

ip flow-egress

ip flow-export

ip flow-top-talkers

Many thanks


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