Cisco Cisco ASR 5500 Leaflet

Contributed by Saurabh Gupta, Cisco TAC Engineer.
Jun 11, 2015

Introduction
Prerequisites
     Requirements
     Components Used
Background Information
     What is CSFB?
Configure
     Pre−Activation Health Check
     Pre−Activation Procedure
     CSFB Activation Procedure
     Post−Activation Procedure
     Rollback Process
Statistics/Status
Verify
Troubleshoot

This document describes how to implement the change(s) specified for Circuit Switch Fall Back (CSFB)
activation in order to allow the voice and Short Messaging Service (SMS) with Mobile Switching Center
(MSC)/Visitor Location Registry (VLR) over a subscriber group (SG) interface. The SG interface is between
Mobility Management Entity (MME) in the Evolved Packet System (EPS) and the VLR, in order to allow
location management coordination and in order to relay certain messages related to circuit switched services
over the EPS system.

This is implemented on a MME deployed on Cisco Aggregated Service Router (ASR) 5x00 series
(ASR5x00).

Ensure that you have Show Support Details (SSDs), bulkstat files, syslog files and any additional CLI output
as required for the identified ASR5x00 nodes.

This document is not restricted to specific software and hardware versions.

The information in this document was created from the devices in a specific lab environment. All of the