Cisco ASR 5000 series Product Overview page 776

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▀ Redundancy Support in ECS

On failure of an active chassis:

On system startup, xDR files are generated in accordance with the standard processes and formats. If the

system fails at any time it results in an inter-chassis session recovery switchover from active to standby and the

following occurs depending on the state of the call/flow records and xDR file at the time of failure:

On the activation of a Standby chassis:

Upon detection of a failure of the original active chassis, the standby chassis transits to the active state and

begins serving the subscriber sessions that were being served by the now failed chassis. Any subsequent new

subscriber session will be processed by this active chassis and will generate xDRs per the standard processes

and procedures.

However, this transition impacts the xDRs for those subscribers that are in-progress at the time of the

transition. For in progress subscribers, a subset of the xDR fields and their contents are carried over to the

newly active chassis via the SRP link. These fields and their contents, which are carried over after an Inter-

chassis Session Recovery switchover, are as follows:

All remaining fields are populated in accordance with the procedures associated with any new flow with the

exceptions that, the field ―First Packet Direction‖ is set to ―Unknown‖ for all in-progress flows that were

interrupted by the switchover and the field ―FDR Reason‖ is marked as a PDSN Handoff and therefore is set to

a value of ―1‖ and corresponding actions are taken by the billing system to assure a proper and correct

accounting of subscriber activities.

▄ Cisco ASR 5000 Series Product Overview

Call/flow records that were being generated and collected in system memory prior to being written out

to /records directory on packet processing card RAM are not recoverable and therefore are lost.

Closed xDRs that have been written out to records directory on packet processing card RAM but that

have yet to be retrieved by the ESS are recoverable.

Closed xDRs that have been retrieved and processed by the ESS have no impact.

HA-CORRELATION-ID

PDSN-CORRELATION-ID (PDSN only)

PDSN-NAS-IP-ADDRESS (PDSN only)

PDSN-NAS-ID (PDSN only)

RADIUS-NAS-IP-ADDRESS

Enhanced Charging Service Overview