для Cisco Cisco Packet Data Gateway (PDG)
Interchassis Session Recovery
Configuring Interchassis Session Recovery (ICSR) ▀
ASR 5500 System Administration Guide, StarOS Release 18 ▄
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Optimizing Switchover Transitions
There are several SRP configuration options that reduce transition time from the active to standby gateways (primarily
P-GW) in support of VoLTE traffic.
P-GW) in support of VoLTE traffic.
Important:
These features require an updated ICSR license to support the enhancements. Contact your Cisco
account representative for additional information.
Allow Non-VoLTE Traffic During ICSR Switchover
The ICSR framework reduces switchover disruption for VoLTE traffic by enabling VoLTE traffic on the newly active
gateway prior to reconciling the billing information and enabling communication with the newly active gateway when
accounting is not deemed critical.
gateway prior to reconciling the billing information and enabling communication with the newly active gateway when
accounting is not deemed critical.
This functionality extends to all other traffic, including data sessions and default bearer traffic for IMS/e911, The
following ICSR functionality is provided for all non-VoLTE data traffic:
following ICSR functionality is provided for all non-VoLTE data traffic:
When a switchover occurs, the newly active gateway forwards all traffic the moment the gateway becomes
active.
External communication with billing servers is deferred. See the traffic flow diagram below.
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).
Charging System) or OFCS (Offline Charging System).