License; Mme Inter-Chassis Session Recovery - Cisco ASR 5000 Series Administration Manual

▀ Features and Functionality - Licensed Enhanced Feature Software
In this release the MME support the X1 provisioning interface and X2 interface for mirroring Intercept Related
Information (IRI) to an upstream Delivery Function/Mediation server. Intercept targets can be provisioned using
subscriber information including MSISDN, IMSI and MEI. The Cisco MME supports secure provisioning via remote
CLI over SSH connections from a DF mediation server. Our solution is currently interoperable with leading third party
solutions.
The intercepted call control data is encoded in a Cisco proprietary message header format using an optional TLV field to
pack the IRI information. The message header includes other identifying information including sequence numbers,
timestamps and session & correlation numbers to correlate session and bearer related information with interception on
other EPC elements. The MME can intercept any of the following IRI information:
Subscriber attachments
Subscriber detachments
Tracking Area Updates
UE requested PDN connectivity
UE requested PDN disconnection
I
Guide.

License

Lawful Intercept is included with purchase of MME bundle

MME Inter-Chassis Session Recovery

The ASR-5000 provides industry-leading carrier class redundancy. The systems protects against all single points of
failure (hardware and software) and attempts to recover to an operational state when multiple simultaneous failures
occur.
The system provides several levels of system redundancy:
Under normal N+1 packet processing card hardware redundancy, if a catastrophic packet processing card failure
occurs all affected calls are migrated to the standby packet processing card if possible. Calls which cannot be
migrated are gracefully terminated with proper call-termination signaling and accounting records are generated
with statistics accurate to the last internal checkpoint
If the Session Recovery feature is enabled, any total packet processing card failure will cause a packet
processing card switchover and all established sessions for supported call-types are recovered without any loss
of session.
Even though ASR 5000 provides excellent intra-chassis redundancy with these two schemes, certain catastrophic
failures which can cause total chassis outages, such as IP routing failures, line-cuts, loss of power, or physical
destruction of the chassis, cannot be protected by this scheme. In such cases, the MME Inter-Chassis Session Recovery
feature provides geographic redundancy between sites. This has the benefit of not only providing enhanced subscriber
experience even during catastrophic outages, but can also protect other systems such as the RAN from subscriber re-
activation storms.
▄ Cisco ASR 5000 Series Mobility Management Entity Administration Guide
38
:
MPORTANT
For more information on Lawful Intercept support, refer Lawful Intercept Configuration
MME in LTE/SAE Wireless Data Services
OL-22987-01