Snapshot function is unique to IP Accounting. The collected data can be used for performance and trending applications that require collections at regular intervals. Polling entire MIB tables across multiple network elements would introduce some inaccuracies, and hence no real “frozen” snapshots. Trying to achieve the same result by synchronously The checkpoint database offers a “frozen” snapshot of the complete network. This copy request can be automated across the network to be executed at the same time, and a Network Management applicationĬan later retrieve the accounting details from the checkpoint database to present consistent accounting data to the operator. To get a snapshot of the traffic statistics,Ī CLI command or SNMP request can be executed to copy the current status from the active database to the checkpoint database. The active collection process always updates the active databaseĪnd therefore constantly increments the counters while packets pass the router. The operator with the opportunity of “snapshot” collections in the network, IP Accounting (Layer 3) maintains two accountingĭatabases: an active database and a checkpoint database. IP Accounting (Layerģ) collects individual IP address details, so it can be used to identify specific users for usage-based billing. Generated by the router or traffic terminating in the router is not included in the accounting statistics. Only transit traffic that enters and leaves the router is measured, and only on an outbound basis. IP Accounting (Layer 3) collects the number of bytes and packets processed by the network element on a source and destination To the questions raised in Chapter 2, “Data Collection Methodology”: It concludes by comparing the IP Accounting features First, the fundamentals are explained,įollowed by an overview of CLI operations, and then SNMP operations. This chapter discusses in detail each flavor of IP Accounting, using a basic structure. The command-line interface (CLI) commands as titles, except for “IP Accounting Access Control List,” where the related CLI command is ip accounting access-violations. Note that Cisco documentation is not always consistent for the different IP Accounting features. IP Accounting Access Control List (ACL).Basic IP Accounting, which this book calls “IP Accounting (Layer 3)”.Refer to coverage of NetFlow Layer 2 and the Security Monitoring Exports feature in Chapter 7, “NetFlow.” Note that NetFlow recently added the export of the MAC addressĪs a new information element. Furthermore, access-list accountingĬurrently cannot be solved with the NetFlow implementation. However, compared to NetFlow, IP Accounting offers some advantages that make it an interestingįeature to investigate: easy results retrieval via a MIB and limited resource consumption. The fact that Cisco has considered replacing IP Accounting by adding new features to NetFlow potentially turns IP Accounting
IP Accounting is a very useful accounting feature in Cisco IOS, but it’s not as well known as other features, such as NetFlow.
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