Cisco Cisco ASR 5000 Technical Manual

Page of 25
Configure the Congestion Control Mechanism on
the ASR 5X00
Document ID: 119151
Contributed by Shashank Varshney, Cisco TAC Engineer.
Jul 23, 2015
Contents
Introduction
Prerequisites
     Requirements
     Components Used
Congestion Control Overview
     MME/SGSN Congestion Control
        APN−Based Session Management Congestion Control
        APN−Based MM Congestion Control
        General NAS−Level Congestion Control
        Overload Reduction by MME on S1−MME Interface
     PGW Control of Overload
Congestion Control Operation on the ASR 5x00
     Call Disconnect on Overload
     Congestion Condition Thresholds
     Service Congestion Policies
Configure
     Enable Congestion Control
     Congestion Control Overload Disconnect
     Congestion Control Policy Configuration
        Congestion Control Policy
        Policy Overload Redirect
        Congestion Control Policy for MME Service
        MME Congestion Control Policy Action Profile
        Congestion Control Policy for SGSN with Releases 17.0 and Later
        SGSN Congestion Control Policy Action Profile
     Congestion Control Threshold
        Congestion Control Threshold Values for MME and SGSN
Verify
     Congestion Control Configuration Verification
        Congestion Control Before Activation
        Congestion Control After Activation
        Congestion Control After Overload Disconnect Activation
        Congestion Control After Activation of Policies Other Than SGSN and MME
        Congestion Control Threshold for Major and Minor Profiles
        Congestion Control Policy Activation for SGSN
        Congestion Control Policy Activation for MME
     Congestion Control Statistics
     Congestion Control Trigger for SGSN by OAM Intervention
Troubleshoot
Related Information

Summary of Contents of technical manual for Cisco Cisco ASR 5000

  • Page 1Configure the Congestion Control Mechanism on the ASR 5X00 Document ID: 119151 Contributed by Shashank Varshney, Cisco TAC Engineer. Jul...
  • Page 2Introduction This document describes how to configure the congestion control mechanism on the Cisco Aggregated Services Router (ASR) 5x00 Series....
  • Page 3 • Maximum number of MM signaling requests are associated with the devices with the subscription for a particular APN...
  • Page 4 • The UE is allowed to initiate the PDN disconnection procedure, but it does not delete the related SM...
  • Page 5In order to indicate the end of the overload situation, the MME sends an Overload Stop message to the eNB:...
  • Page 6Congestion Control Operation on the ASR 5x00 The congestion control operation is based on the configuration of these additional features:...
  • Page 7Service Congestion Policies The congestion service policies are configurable for each service, such as Packet Data Serving Node (PDSN), Gateway...
  • Page 8 ♦ Max−sessions−per−service−utilization: This specifies the percentage of max sessions per service utilization threshold. Once it exceeds the defined value,...
  • Page 9Policy Overload Redirect This should be configured if a redirect action is configured for the Call Session Control Function (CSCF),...
  • Page 10Note: The action−profile parameter defines the action profile that is associated with the previously mentioned policy type (minor, major, or...
  • Page 11 • Apn−based: This indicates that requests for the Access Point Names (APNs) that are configured for the congestion control...
  • Page 12 • Combined−attaches: This causes no congestion control action to be completed for packets that contain combined attach requests. •...
  • Page 13 • Lapi: This indicates that requests with LAPI will be rejected for the call events; otherwise, both LAPI and...
  • Page 14Congestion Control Policy for SGSN with Releases 17.0 and Later In Releases 17.0 and later, the SGSN also required a...
  • Page 15 ♦ Service−req: This defines the SR message that is received by the SGSN. • Actions: This defines the actions...
  • Page 16Here are some notes about this syntax: • Message Type/call Event: When the SM messages policy is defined, it is...
  • Page 17 30 seconds, with a default value of five seconds. • port−rx−utilization: This parameter defines the average percent utilization of...
  • Page 18 include pre−configured default values. • Major: This trigger level defines the major threshold values for different triggers. The values...
  • Page 19of congestion control. Congestion Control Before Activation [local]st40−sim# show congestion−control configuration | more Congestion−control: disabled ................... Congestion Control After Activation...
  • Page 20and minor thresholds are required to be configured. These three profiles can later be used along with a congestion control...
  • Page 21 service control cpu utilization: 60% system memory utilization: 60% message queue utilization: 60% message queue wait time: 3 seconds...
  • Page 22 pdsn−service: none hsgw−service: none ha−service: none ggsn−service: drop closedrp−service: none lns−service: none cscf−service: reject pdif−service: none wsg−service: none pdg−service:...
  • Page 23 Critical Action−profile : sgsn_critical Major Action−profile : sgsn_major Minor Action−profile : sgsn_minor mme−service: Critical Action−profile : mme_critical Major Action−profile...
  • Page 24 Congestion applied: 0 times Critical Congestion Control Resource Limits system cpu use exceeded: No service cpu use exceeded: No system...
  • Page 25 • Command Line Interface Reference, StarOS Release 17 • Technical Support & Documentation − Cisco Systems Updated: Jul 23,...
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