Cisco Cisco ASR 5000 Guia De Resolução De Problemas

Contributed by Albert Zagrobskiy, Cisco Advanced Services, and
Krishna Kishore DV, Cisco TAC Engineer.

Jun 12, 2015

Introduction
MME Protection
     Network Overload Protection: Attach Rate Throttling
     Network Overload Protection: Paging Throttling
        Sample Configuration
     Network Overload Protection: DDN Throttling (Serving GateWay Functionality, Protects MME)
     Network Overload Protection: EGTP Path Failure Throttling
        Sample Configuration
        Enhanced Congestion Control
     Congestion Condition Thresholds
     Thresholds and Tolerance Levels
     Service Control CPU Thresholds
     System CPU Thresholds
     System Memory Thresholds
Related Information

This document highlights the various Mobility Management Entity (MME) overload protection methods and
features available on the Cisco Aggregation Services Router (ASR) 5000 Series. In the ASR 5000 Series,
Cisco gives the customer various means to achieve control and this article explains the features and related
CLI commands.

Attach Rate Throttling protects neighbor Network Elements such as Home Subscriber Server (HSS), Policy
and Charging Rules Function (PCRF), and Online Charging Server (OCS), and internal MME resources such
as imsimgr and sessmgr. Attach Rate Throttling processes the new calls that arrive to imsimgr, such at
Attaches and Inter−MME/Serving GPRS Supporting Node (SGSN) Tracking Area Update (TAUs).

This picture shows the message flow for calls and throttling queues.