Read IP accounting, though not used much these days, but a nice feature on security and inspection level.
Uses:
1. IP accounting L3, which is configured only on outbound and doesn't take into account the traffic terminating or originating on the router itself. Maintains Acitve and Checkpoint database to store the history and active traffic logs,
2. IP Accounting ACL checks the traffic which doesn't match any specific acl. A range of IP address can be provided. Can be put on both ingress and egress ports. Keep incrementing the hits for a subset of address. Collected data is accessible via CLI and SNMP; however, the initial configuration is required via CLI. To retrieve the collection results via SNMP, you need to enable SNMP on the router first. When configuring SNMP, distinguish between read-only access and read-write access.
3. IP accounting MAC for LAN etc. Best for usage billing per IP id per customer. Has only active logs visual feature
4. IP Accounting Precedence: provides IP precedence-related traffic accounting information. The collection per interface consists of the total number of packets and bytes for each of the eight IP Precedence values, separately per direction (send and receive).Sub-interfaces can be helpful for per user.
Link to IP accounting by Cisco Press
Good Luck!
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