[Flow-tools] Setting up NetFlow on 6509

Mon Mar 8 12:46:15 EST 2010

That is probably outside of the scope of this mailing list and leans into routing protocols and the like.

-Drew

From: flow-tools-bounces at list.splintered.net [mailto:flow-tools-bounces at list.splintered.net] On Behalf Of Travis Formoso
Sent: Monday, March 08, 2010 12:43 PM
To: Volk,Gregory B; flow-tools at list.splintered.net
Subject: RE: [Flow-tools] Setting up NetFlow on 6509

Greg,

One question before setting up the loopback0 interface. Does it matter what IP address I use (obviously not one in use.)?

Thanks

________________________________
From: Volk,Gregory B [mailto:greg.volk at edwardjones.com]
Sent: Monday, March 08, 2010 12:30 PM
To: Travis Formoso; flow-tools at list.splintered.net
Subject: RE: [Flow-tools] Setting up NetFlow on 6509
It's been a while since I exported netflow data from a 65xx box, but I think this is the config I used in the past:

ip flow-export source Loopback0
ip flow-export version 5 origin-as
ip flow-export destination 192.168.137.7 2055
mls aging fast threshold 1
mls aging long 300
mls flow ip full
mls nde sender

Be advised tho that netflow requires resources from a router utilization perspective. It does require some CPU to generate those UDP datagrams and populate them with data. You may want to test these commands prior to implementation, or at least implement during a low traffic time and watch the CPU.

I stopped using netflow data from my 65xx's several years ago when we went to IOS 12.2(18)SXD7 because that IOS had a bug where the netflow data was bogus. We are in the process of upgrading to 6509-E's with sup720's so I'm looking forward to getting the data back now. I don't know how applicable the above commands are to more recent IOS versions.

________________________________
From: Travis Formoso [mailto:tformoso at Syracuse.com]
Sent: Monday, March 08, 2010 10:57 AM
To: Volk,Gregory B; flow-tools at list.splintered.net
Subject: RE: [Flow-tools] Setting up NetFlow on 6509
Greg,

We are not running IOS-XR, however this is almost the same and I can set this up.

With the loopback0 interface setup what are the commands I need to run, so that I am monitoring this device correctly with netflow? Would it be:

ip flow-export source loopback0
ip flow-export version 5
ip flow-export destination 172.20.200.50

Now I configure netflow for switched traffic:
mls nde sender version 5
mls flow ip interface-full
mls nde interface

On the interface (loopback0): (Not sure if this is needed for the loopback interface?)
ip route-cache flow

Thanks for the help.

________________________________
From: Volk,Gregory B [mailto:greg.volk at edwardjones.com]
Sent: Monday, March 08, 2010 11:50 AM
To: Travis Formoso; flow-tools at list.splintered.net
Subject: RE: [Flow-tools] Setting up NetFlow on 6509
>
>What should the loopback interface look like?
>

Here's what one of mine looks like, but it requires some config integration with OSPF, assuming you're running OSPF.

router#sho run int lo0
Building configuration...

Current configuration : 128 bytes
!
interface Loopback0
 description *** MANAGEMENT & OSPF ID ***
 ip address 10.130.25.1 255.255.255.255
 ip pim sparse-mode
end

router#

This doc from cisco... http://www.cisco.com/en/US/docs/ios_xr_sw/iosxr_r3.0/interfaces/configuration/guide/hc3loop.html ...may help, but it's for IOS-XR.

________________________________
From: Travis Formoso [mailto:tformoso at Syracuse.com]
Sent: Monday, March 08, 2010 10:30 AM
To: Volk,Gregory B; flow-tools at list.splintered.net
Subject: RE: [Flow-tools] Setting up NetFlow on 6509
Hey Greg,

On the 6509 there is currently no loopback interface so I will need to set this up.

What should the loopback interface look like?

Also once I set it to this loopback I will not need to export to the VLAN's as this would monitor all the ports?

Thanks

________________________________
From: Volk,Gregory B [mailto:greg.volk at edwardjones.com]
Sent: Monday, March 08, 2010 11:19 AM
To: Travis Formoso; flow-tools at list.splintered.net
Subject: RE: [Flow-tools] Setting up NetFlow on 6509
Have you tried setting the source to a non-vlan (physical or loopback) interface like:

ip flow-export source Loopback0
I don't know if that will fix your issue, but I always source my netflow data from a loopback interface that is dedicated for management traffic.

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________________________________
From: flow-tools-bounces at list.splintered.net [mailto:flow-tools-bounces at list.splintered.net] On Behalf Of Travis Formoso
Sent: Monday, March 08, 2010 9:47 AM
To: flow-tools at list.splintered.net
Subject: [Flow-tools] Setting up NetFlow on 6509
Hello all,

I am trying to setup a NetFlow product on our 6509. We have a number of different VLAN's across our network and I think I would want to monitor those VLAN's and that should capture the traffic on the 6509 (correct me if I am wrong.) The way the product is licensed is by source (a source is a router or switch.) When I try to setup netflow each VLAN comes in as a different source and I would like it if I can use the 6509 as just once source. Here are the commands I am using to set this up.

in configuration mode:

ip flow-export source vlan10
ip flow-export version 5
ip flow-export destination 172.20.200.50

Now I configure netflow for switched traffic:
mls nde sender version 5
mls flow ip interface-full
mls nde interface

On the interface (vlan 10):
ip route-cache flow

After doing that I see that incoming traffic is being monitored by NetFlow, however as said that interface (VLAN) is coming in as a source, so if I configure another VLAN I now have 2 sources, but I would like to set this up so the 6509 is just one source, monitoring all the VLAN's.

I wanted to know if these commands are correct, if I should be monitoring the VLAN's and if anyone knows how to set this up as explained above with the 6509 as one source.

Thank you,

Travis

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