Some quick articles are here for me to remember more than they are anything else...
Configuring NetFlow
on switches and routers is pretty straight forward. There are a couple of things to keep in mind:
- Support or features per device vary
- Are you looking for layer 2 or 3 traffic?
Netflow was designed
to report on traffic being routed.
Therefore you may not see traffic that stays on the same VLan without
extra configuration.
To turn on NetFlow:
R1(config)#interface
fa0/1
R1(config-if)#ip
route-cache flow
Next export the info
to a network management station of some sort:
R1(config)#ip
flow-export 10.10.10.10 2055 version 5
(2055 is the UDP port (optional) and version can be 5 or 9, depending on
what you NMS supports)
Enabling layer 2 for
NetFlow on a Vlan:
R1(config)#ip flow
export layer 2-switched vlan 10,20-25
(for VLan 10,20-25)
There are many more options available here:
Hopefully this helps
you out.
JM
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