Recently Cisco has implemented NetFlow 9 for its popular ASA 5500 security and firewall appliances. But this implementation of NetFlow is quite different from what other Cisco devices provide. It is called “Netflow Security Event Logging” (NSEL) and was originally introduced on the Cisco ASA 5580. Now, with the latest firmware (ASA 8.2.x or later), it is now extended to other Cisco ASA models.
How can I use that for network monitoring and bandwidth monitoring?