External Storage System - Cisco ASR 5000 series Product Overview

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Enhanced Charging Service Overview

External Storage System

The External Storage System (ESS) is a high availability, fault tolerant, redundant solution for short-term storage of

files containing detail records (UDRs/EDRs/FDRs (xDRs)). To avoid loss of xDRs on the chassis due to overwriting,

deletion, or unforeseen events such as power or network failure or unplanned chassis switchover, xDRs are off-loaded to

ESS for storage and analysis to avoid loss of charging and network analysis information contained in the xDRs.

The xDR files can be pulled by the L-ESS from the chassis, or the chassis can push the xDR files to the L-ESS using

SFTP protocol. In the Push mode, the L-ESS URL to which the CDR files need to be transferred to is specified. The

configuration allows a primary and a secondary server to be configured. Configuring the secondary server is optional.

Whenever a file transfer to the primary server fails for four consecutive times, the files will be transferred to the

secondary server. The transfer will switch back to the original primary server when:

Four consecutive transfer failures to the secondary server occur

After switching from the primary server, 30 minutes elapses

In the push transfer mode, the following can be configured:

Transfer interval: A time interval, in seconds, after which the CDRs are pushed to the configured IP periodically.

All the files that are completed before the PUSH timer expires are pushed.

Remove file after transfer: An option to keep or remove the CDR files on the hard disk after they are transferred

to the L-ESS successfully.

The system running with ECS stores xDRs on an L-ESS, and the billing system collects the xDRs form the L-ESS and

correlates them with the AAA accounting messages using 3GPP2-Correlation-IDs (for PDSN) or Charging IDs (for

For more information on the ESS, please refer to the ESS Installation and Administration Guide.

External Storage System ▀

Cisco ASR 5000 Series Product Overview ▄