GTPV1/V2 Echo Support for Peer MME and SGSN

Feature Summary and Revision History

Summary Data

Applicable Product(s) or Functional Area

MME

Applicable Platform(s)

  • ASR 5500

  • VPC-DI

  • VPC-SI

Feature Default

Disabled - Configuration Required

Related Changes in This Release

Not applicable

Related Documentation

  • Command Line Interface Reference

  • MME Administration Guide

  • Statistics and Counters Reference

Revision History

Revision Details

Release

This feature is fully qualified in this release.

21.18

First introduced.

Important 

This feature is not fully qualified in this release, and is available only for testing purposes. For more information, contact your Cisco Account representative.

21.17

Feature Description

MME supports path management status of MME (S10) and SGSN (Gn/Gp). MME sends and receives GTP V2 Echo Message for Peer Node status in S10 Interface and GTP V1 Echo Message for Peer node status in Gn/Gp Interface. MME sends and receives the Echo message for Configured peer Node in MME regardless of GTP session. When peer-sgsn echo-params CLI is enabled under mme-service, MME will initiate Echo to peer Gn/Gp SGSNs configured under mme-service and also to peer SGSNs added/created during 3G-4G/4G-3G Gn/Gp Handover.

Path failure is detected when there is no response to Echo Request even after max retransmissions. Path failure detection is not done based on "Restart counter value change in echo response".

GTP V1 Echo Message is supported in compliance with the 3GPP 29.060 7.2 Path Management Messages operation and GTP V2 Echo Message is supported in compliance with the 3GPP 29.274, 7.1 Path Management Messages operation.

Existing traps SGSNGtpcPathFailure, SGSNGtpcPathFailureClear, EGTPCPathFail, and EGTPCPathFailClear are used by this feature.

Configuring GTPV1/V2 Echo Support for Peer MME and SGSN

This section provides information on the CLI commands to configure GTPV1/V2 Echo Support for Peer MME and SGSN feature.

Configuring Path Management for Peer MME

Use the following configuration to configure the path management for Peer MME. 

configure  
   context context_name 
      mme-service mme_service_name 
         peer-mme echo-params interval interval retransmission-timeout retransmission_timeout max-retransmissions max_retransmissions reconnect-interval reconnect_interval 
               [ no ] peer-mme echo-params 
               end

NOTES:

  • no : Removes the path management configuration for peer MME with Gn/Gp capability.

  • peer-mme : Configures a Peer MME for inter-MME relocations.

  • echo-params : Configures echo parameters for peer MME with GN/GP capability.

  • interval interval : Configures echo interval in seconds. interval must be an integer from 60 to 300.

  • retransmission-timeout retransmission_timeout : Configures echo retransmission timeout in seconds. retransmission_timeout must be an integer from 1 to 20.

  • max-retransmissions max_retransmissions : Configures maximum retries for echo request. max-retransmissions must be an integer from 0 to 15.

  • reconnect-interval reconnect_interval : Configures echo interval to be used once a peer node is detected to be unreachable. Retransmission is not applicable in this time. reconnect_interval must be an integer from 60 to 86400.

Configuring Path Management for Peer SGSN

Use the following configuration to configure the path management for Peer SGSN. 

configure  
   context context_name 
      mme-service mme_service_name 
         peer-sgsn echo-params interval interval retransmission_timeout retransmission_timeout max-retransmissions max-retransmissions reconnect-interval reconnect_interval 
               no peer-sgsn echo-params 
               end

NOTES:

  • no : Removes the path management configuration for peer SGSN with Gn/Gp capability.

  • echo-params : Configures echo parameters for peer SGSN with GN/GP capability.

  • interval interval : Configures echo interval in seconds. interval must be an integer from 60 to 300.

  • retransmission-timeout retransmission_timeout : Configures echo retransmission timeout in seconds. retransmission_timeout must be an integer from 1 to 20.

  • max-retransmissions max-retransmissions : Configures maximum retries for echo request. max-retransmissions must be an integer from 0 to 15.

  • reconnect-interval reconnect_interval : Configures echo interval to be used once a peer node is detected to be unreachable. Retransmission is not applicable in this time. reconnect_interval must be an integer from 60 to 86400.

Monitoring and Troubleshooting

This section provides information regarding show commands available to monitor this feature.

Show Commands and Outputs

show mme-service all name

The output of this command includes the following fields:

  • PEER MME Echo Parameters :

    • interval

    • retransmission timeout

    • max retransmissions

    • reconnect interval

  • PEER GN/GP SGSN Echo Parameters:

    • interval

    • retransmission timeout

    • max retransmissions

    • reconnect interval

show egtpc statistics

The output of this command includes the following fields:

Path Management Messages:

PEER MME Echo Request

  • Total TX

  • Initial TX

  • Retrans TX

PEER MME Echo Response:

  • Total RX

show egtpc peers mme 

+----Status:   (D) - Dead    (A) – Alive
	|
	|+---IP Type:     (S) - Static  (D) – Dynamic
	||  Service               Echo Req           Echo Req   Echo Rsp
	vv  ID      Peer Address  Time of Creation   Sent       Retransmitted  Received
	-- --- ---------------    ------------------ --------  ---------------

Total Peers:

Show sgtpc statistic

Path Management Messages:

Echo Request:

  Total   Echo-Req TX:     Total   Echo-Req RX: 
  Initial Echo-Req TX:     Initial Echo-Req RX: 
  Retrans Echo-Req TX:

Echo Response:

Total Echo-Rsp TX:    Total Echo-Rsp RX:

show sgtpc peers

Path     Service               Echo Req       Echo Req        Echo Rsp
Status   ID      Peer Address           Sent         Retransmitted     Received
----     --- -----------------------  -----------   ---------------   ---------