Nas Signalling Security - Cisco ASR 5000 Series Administration Manual

MME in LTE/SAE Wireless Data Services
Thresholding reports conditions using one of the following mechanisms:
SNMP traps: SNMP traps have been created that indicate the condition (high threshold crossing and/or clear) of
each of the monitored values.
Generation of specific traps can be enabled or disabled on the chassis. Ensuring that only important faults get displayed.
SNMP traps are supported in both Alert and Alarm modes.
Logs: The system provides a facility called threshold for which active and event logs can be generated. As with
other system facilities, logs are generated Log messages pertaining to the condition of a monitored value are
generated with a severity level of WARNING.
Logs are supported in both the Alert and the Alarm models.
Alarm System: High threshold alarms generated within the specified polling interval are considered
"outstanding" until a the condition no longer exists or a condition clear alarm is generated. "Outstanding"
alarms are reported to the system's alarm subsystem and are viewable through the Alarm Management menu in
the Web Element Manager.
The Alarm System is used only in conjunction with the Alarm model.
I
Configuration Guide.

NAS Signalling Security

It provides integrity protection and encryption of NAS signalling. The NAS security association is between the UE and
the MME.
The MME uses the NAS security mode command procedure to establish a NAS security association between the UE
and MME, in order to protect the further NAS signalling messages.
The MME implements AES algorithm (128-EEA1 and 128-EEA2) for NAS signalling ciphering and SNOW 3G
algorithm (128-EIA1 and 128-EIA2) for NAS signalling integrity protection.
128-EIA1= SNOW 3G
128-EIA2= AES
OL-22987-01
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MPORTANT
For more information on threshold crossing alert configuration, refer Thresholding
Cisco ASR 5000 Series Mobility Management Entity Administration Guide ▄
Features and Functionality - Base Software ▀
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