Cisco ASR 5500 System Administration Manual page 303

Interchassis Session Recovery
• When the newly active gateway receives all billing-related checkpointing information from the previously
active gateway, it reconciles the billing data before communicating with external billing servers OCS
(Online Charging System) or OFCS (Offline Charging System).
Figure 11: Call Flow: Reduce Non-VoLTE Data Outage
The switchover allow-all-data-traffic SRP Configuration mode CLI command allows all data traffic (VoLTE
and non-VoLTE) during switchover transition. This command overwrites the switchover
allow-volte-data-traffic command if enabled on a P-GW.
configure
context context_name
service-redundancy-protocol
switchover allow-all-data-traffic
The switchover allow-all-data-traffic command must be run on both chassis to enable this feature.
Important
The switchover allow-volte-data-traffic SRP Configuration mode CLI command allows VoLTE data traffic
during ICSR switchover transition.
configure
context context_name
Configuring the Service Redundancy Protocol (SRP) Context
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