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I agree, you should use L3 links as much as possible. I don't see a need to ether channel L3 links. The routes would be equal cost load balanced, so you are not gaining bandwidth and each path would be in the route table so you are not gaining any pe...
To get the info your looking for, you will need to enable mls flows as well as netflow.snippet from working 6509:mls rp nde-address x.x.x.xmls flow ip fullmls nde sender version 5ip flow-export source Loopback1ip flow-export version 5 peer-asip flow-...