Co-Located SPGW Selection for Emergency Bearer

This chapter describes the following topics:

Feature Summary and Revision History

Summary Data

Applicable Product(s) or Functional Area

MME

Applicable Platform(s)

  • ASR 5500

  • VPC-DI

  • VPC-SI

Default Setting

Disabled - Configuration Required

Related Changes in This Release

Not Applicable

Related Documentation

  • Command Line Interface Reference

  • MME Administration Guide

Revision History

Revision Details

Release

Introduced to 21.17 release.

21.17

First Introduced.

21.14.8

Feature Changes

Previous Behavior: MME selects random P-GW based on LTE Emergency Profile configuration for Emergency Bearer service requested using PDN Connectivity Request.

New Behavior: MME uses the canonical name of the selected S-GW (from DNS response) for the previously established PDNs and compares it with the statically configured P-GW collocation string in the LTE emergency profile to select the P-GW. The static P-GW collocation string must be configured with the canonical node name of the P-GW to ensure to select collocated node for emergency call.


Important

This behavior applies only to the PDN connectivity request for Emergency Bearer Service.

Command Changes

pgw co-location

Use the following configuration to configure P-GW co-location:

configure 
   lte-policy  
      lte-emergency-profile profile_name 
         [ no ] pgw co-location 
         end

NOTES:

  • no Disables the P-GW co-location configuration.

  • co-location Configures to select the co-located S-GW/P-GW node based on static P-GW configuration and S-GW selected through DNS.

Performance Indicator Changes

show lte-policy lte-emergency-profile <profile_name>

The output of this command includes the following fields:

  • pgw co-location: Indicates if the P-GW co-location feature is enabled or disabled.