Troubleshoot 4G ASR KPI Degradation due to an Increase in mme-hss-user-unknown Disconnect Reason

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Updated:July 17, 2019

Document ID:214633

Bias-Free Language

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Introduction

This document describes how to troubleshoot the problem that occurs when 4G Attach Success Rate (ASR) Key Performance Indicator (KPI) degradation takes place when mme-hss-user-unknown disconnect reason is increased.

Prerequisites

Requirements

Cisco recommends that you have knowledge of these topics:

Hardware knowledge of 5000/5500
StarOS

Components Used

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 devices used in this document started with a cleared (default) configuration. If your network is live, ensure that you understand the potential impact of any command.

Abbreviations

ASR	Attach Success Rate
KPI	Key Performance Indicator
AIR	Authentication Information Request
AIA	Authentication Information Answer
CER	Capability Exchange Request
CEA	Capability Exchange Answer
MME	Mobility Management Entity
HSS	Home Subscriber Server
DPC	Data Processing Card
RFC	Request for Comments
AVP	Attribute–value pair

Problem

The Service provider reported the 4G ASR degradation in one MME and the disconnect reason 'mme-hss-user-unknown' was increased.

"mme-hss-user-unknown(375)" disconnect reason describes the total number of sessions disconnected because the MME HSS user is unknown.

One failure trace that was captured reported that HSS was rejecting the Authentication as result-code DIAMETER_MISSING_AVP (5005) in AIA message.

MME constantly got "DIAMETER_MISSING_AVP (5005)" from HSS and this is how the failure AIA message looks like:

INBOUND>>>>>  From diamproxy:52 oxy_conn_mgmt.c:3406 (Callid 4c0ea07a) 08:42:11:109 Eventid:81991(5)
Diameter message from 10.5.40.X:6000 to 10.0.231.Y:49417
Base Header Information:
   Version:            0x01        (1)
   Message Length:     0x000110    (272)
   Command Flags:      0x40        (64)  PXY
   Command Code:       0x00013e    (318) Authentication-Information-Answer
   Application ID:     0x01000023  (16777251)   3GPP-S6a
   Hop2Hop-ID:         0xadb40545  (2914256197)
   End2End-ID:         0x2cafadd5  (749710805)
  AVP Information:
     [M]  Session-Id
        Code:      0x00000107 (263) Session-Id
        Flags:     0x40       (64)  [M]
        Length:    0x000069   (105)
        Data: 0004-diamproxy.MMEC001.MMEGI32000.MME.EPC.MNC0XY.MCC404.3GPPNET;1276027002;2496613;5c204e8b-16502
     [M]  Auth-Session-State
        Code:      0x00000115 (277) Auth-Session-State
        Flags:     0x40       (64)  [M]
        Length:    0x00000c   (12)
        Data: NO_STATE_MAINTAINED (1)
     [M]  Origin-Host
        Code:      0x00000108 (264) Origin-Host
        Flags:     0x40       (64)  [M]
        Length:    0x000033   (51)
        Data: hss101.epc.mnc0XY.mcc404.3gppnetwork.org
     [M]  Origin-Realm
        Code:      0x00000128 (296) Origin-Realm
        Flags:     0x40       (64)  [M]
        Length:    0x000029  (41)
        Data: epc.mnc0XY.mcc404.3gppnetwork.org
     [M]  Result-Code
        Code:      0x0000010c (268) Result-Code
        Flags:     0x40       (64)  [M]
        Length:    0x00000c   (12)
        Data: DIAMETER_MISSING_AVP (5005)                 >> DIAMETER_MISSING_AVP(5005)received from HSS
     [M]  Failed-AVP
        Code:      0x00000117 (279) Failed-AVP
        Flags:     0x40       (64)  [M]
        Length:    0x000018   (24)
         [V] [M]  Visited-PLMN-Id
            Code:      0x0000057f (1407) Visited-PLMN-Id
            Flags:     0xc0       (192) [V]  [M]
            Length:    0x00000d   (13)
            Vendor-Id: 0x000028af (10415) 3GPP
            Data: 0x00

Troubleshoot

This section provides information you can use in order to troubleshoot the problem of ASR KPI degradation due to an increase in mme-hss-user-unknown disconnect reason.

The collected "mon sub" is traced and compared with the success and failure scenario. The supported-features AVP is missing in the AIR from MME to HSS server.

Successful AIR and AIA message are captured from the mon sub trace. This is the AIR message that is sent from MME to HSS:

Monday December 24 2018
<<<<OUTBOUND  From diamproxy:49 diamproxy_rlf.c:553 (Callid 62adced4) 08:42:39:580 Eventid:81990(5)
Diameter message from 10.0.231.Y:48273 to 10.5.40.X:6000
  Base Header Information:
   Version:            0x01        (1)
   Message Length:     0x0001c4   (452)
   Command Flags:      0xc0        (192) REQ PXY
   Command Code:       0x00013e    (318) Authentication-Information-Request
   Application ID:     0x01000023(16777251)   3GPP-S6a
   Hop2Hop-ID:         0xadbdf12a  (2914906410)
   End2End-ID:         0x60bd9382  (1623036802)
  AVP Information:
     [M]Session-Id
        Code:      0x00000107 (263) Session-Id
        Flags:     0x40      (64)  [M]
        Length:    0x000069  (105)
        Data: 0001-diamproxy.MMEC001.MMEGI32000.MME.EPC.MNC0XY.MCC404.3GPPNET;1655557844;4204805;5c204ea7-30502
     [M]Auth-Session-State
        Code:      0x00000115 (277) Auth-Session-State
        Flags:     0x40      (64)  [M]
        Length:    0x00000c  (12)
        Data: NO_STATE_MAINTAINED (1)
     [M]Origin-Host
        Code:      0x00000108 (264) Origin-Host
        Flags:     0x40      (64)  [M]
        Length:    0x00004f  (79)
        Data: 0001-diamproxy.MMEC001.MMEGI32000.MME.EPC.MNC0XY.MCC404.3GPPNETWORK.ORG
     [M]Origin-Realm
        Code:      0x00000128 (296) Origin-Realm
        Flags:     0x40      (64)  [M]
        Length:    0x00002d  (45)
        Data: MME.epc.mnc0XY.mcc404.3gppnetwork.org
     [M]Destination-Realm
        Code:      0x0000011b (283) Destination-Realm
        Flags:     0x40      (64)  [M]
        Length:    0x000029  (41)
        Data: epc.mnc0XY.mcc404.3gppnetwork.org
     [M]User-Name
        Code:      0x00000001 (1) User-Name
        Flags:     0x40      (64)  [M]
        Length:    0x000017  (23)
        Data: 404XY0000011111
     [V]Supported-Features
        Code:      0x00000274 (628) Supported-Features
        Flags:    0x80       (128) [V]
        Length:    0x000038  (56)
        Vendor-Id: 0x000028af (10415) 3GPP
         [M]Vendor-Id
            Code:      0x0000010a (266) Vendor-Id
            Flags:     0x40      (64)  [M]
            Length:    0x00000c  (12)
            Data: 10415
         [V]Feature-List-ID
            Code:      0x00000275 (629) Feature-List-ID
            Flags:     0x80      (128) [V]
            Length:    0x000010  (16)
            Vendor-Id: 0x000028af (10415) 3GPP
            Data: 1
         [V]Feature-List
            Code:      0x00000276 (630) Feature-List
            Flags:     0x80      (128) [V]
            Length:    0x000010  (16)
            Vendor-Id: 0x000028af (10415) 3GPP
            Data: 469763591
     [V] [M]Requested-EUTRAN-Authentication-Info
        Code:      0x00000580 (1408) Requested-EUTRAN-Authentication-Info
        Flags:     0xc0      (192) [V]  [M]
        Length:    0x00002c  (44)
        Vendor-Id: 0x000028af (10415) 3GPP
         [V] [M]  Number-Of-Requested-Vectors
            Code:      0x00000582 (1410) Number-Of-Requested-Vectors
            Flags:     0xc0      (192) [V]  [M]
            Length:    0x000010  (16)
            Vendor-Id: 0x000028af (10415) 3GPP
            Data: 1
         [V] [M]  Immediate-Response-Preferred
            Code:      0x00000584 (1412) Immediate-Response-Preferred
            Flags:     0xc0      (192) [V]  [M]
            Length:   0x000010   (16)
            Vendor-Id: 0x000028af (10415) 3GPP
            Data: 1
     [V] [M]Visited-PLMN-Id
        Code:      0x0000057f (1407) Visited-PLMN-Id
        Flags:    0xc0       (192) [V]  [M]
        Length:    0x00000f  (15)
        Vendor-Id: 0x000028af (10415) 3GPP
        Data: 0x04f4YX

The AIA message that is sent from HSS to MME is:

INBOUND>>>>>  From diamproxy:49 oxy_conn_mgmt.c:3406 (Callid 62adced4) 08:42:39:601 Eventid:81991(5)
Diameter message from 10.5.40.X:6000 to 10.0.231.Y:48273
  Base Header Information:
   Version:            0x01        (1)
   Message Length:     0x000198   (408)
   Command Flags:      0x40        (64)PXY
   Command Code:       0x00013e    (318) Authentication-Information-Answer
   Application ID:     0x01000023(16777251)   3GPP-S6a
   Hop2Hop-ID:         0xadbdf12a  (2914906410)
   End2End-ID:         0x60bd9382  (1623036802)
  AVP Information:
     [M]Session-Id
        Code:      0x00000107 (263) Session-Id
        Flags:     0x40      (64)  [M]
        Length:    0x000069  (105)
        Data: 0001-diamproxy.MMEC001.MMEGI32000.MME.EPC.MNC0XY.MCC404.3GPPNET;1655557844;4204805;5c204ea7-30502
    [M]Auth-Session-State
        Code:      0x00000115 (277) Auth-Session-State
        Flags:     0x40      (64)  [M]
        Length:    0x00000c  (12)
        Data: NO_STATE_MAINTAINED (1)
     [M]Origin-Realm
        Code:      0x00000128 (296) Origin-Realm
        Flags:     0x40      (64)  [M]
        Length:    0x000029  (41)
        Data: epc.mnc0XY.mcc404.3gppnetwork.org
     [M]Origin-Host
        Code:      0x00000108 (264) Origin-Host
        Flags:     0x40      (64)  [M]
        Length:    0x000033  (51)
        Data: hss304.epc.mnc0XY.mcc404.3gppnetwork.org
     [V] [M]Authentication-Info
        Code:      0x00000585 (1413) Authentication-Info
        Flags:     0xc0      (192) [V]  [M]
        Length:    0x0000a0  (160)
        Vendor-Id: 0x000028af (10415) 3GPP
         [V] [M]  EUTRAN-Vector
            Code:      0x00000586 (1414) EUTRAN-Vector
            Flags:     0xc0      (192) [V]  [M]
            Length:    0x000094  (148)
            Vendor-Id: 0x000028af (10415) 3GPP
             [V] [M]  Item-Number
                Code:      0x0000058b (1419) Item-Number
                Flags:     0xc0      (192) [V]  [M]
                Length:    0x000010  (16)
                Vendor-Id: 0x000028af (10415) 3GPP
                Data: 1
             [V] [M]  RAND
                Code:      0x000005a7 (1447) RAND
                Flags:     0xc0      (192) [V]  [M]
                Length:    0x00001c  (28)
                Vendor-Id: 0x000028af (10415) 3GPP
                Data: 0xc8d8ecce3d684b36ee5aa7aaadaf2658
             [V] [M]  XRES
                Code:      0x000005a8 (1448) XRES
                Flags:     0xc0      (192) [V]  [M]
                Length:    0x000014  (20)
                Vendor-Id: 0x000028af (10415) 3GPP
                Data: 0x7a74729d5a811ac9
             [V] [M]  AUTN
                Code:      0x000005a9 (1449) AUTN
                Flags:     0xc0      (192) [V]  [M]
                Length:    0x00001c  (28)
                Vendor-Id: 0x000028af (10415) 3GPP
                Data: 0xddc5adb739e6800088e9c8135c3099d4
             [V] [M]  KASME
                Code:      0x000005aa (1450) KASME
                Flags:     0xc0      (192) [V]  [M]
                Length:    0x00002c  (44)
                Vendor-Id: 0x000028af (10415) 3GPP
                Data: 0xbf4c4f11f05d9c8c1e39d1066c6cdb92080760e40d0273b015cfffd4a20325fc
     [M]Result-Code
        Code:      0x0000010c (268) Result-Code
        Flags:     0x40      (64)  [M]
        Length:    0x00000c  (12)
        Data: DIAMETER_SUCCESS (2001)

The failure AIR and AIA messages are captured from the mon sub trace.

The AIR message that is sent from MME to HSS is:

<<<<OUTBOUND  From diamproxy:52 diamproxy_rlf.c:553 (Callid 4c0ea07a) 08:42:11:089 Eventid:81990(5)
Diameter message from 10.0.231.Y:49417 to 10.5.40.X:6000
  Base Header Information:
   Version:            0x01        (1)
   Message Length:     0x000150    (336)
   Command Flags:      0xc0        (192) REQ PXY 
   Command Code:       0x00013e    (318) Authentication-Information-Request
   Application ID:     0x01000023  (16777251)   3GPP-S6a
   Hop2Hop-ID:         0xadb40545  (2914256197)
   End2End-ID:         0x2cafadd5  (749710805)
  AVP Information:
     [M]  Session-Id
        Code:      0x00000107 (263) Session-Id
        Flags:     0x40       (64)  [M]
        Length:    0x000069   (105)
        Data: 0004-diamproxy.MMEC001.MMEGI32000.MME.EPC.MNC0XY.MCC404.3GPPNET;1276027002;2496613;5c204e8b-16502
     [M]  Auth-Session-State
        Code:      0x00000115 (277) Auth-Session-State
        Flags:     0x40       (64)  [M]
        Length:    0x00000c   (12)
        Data: NO_STATE_MAINTAINED (1)
     [M]  Origin-Host
        Code:      0x00000108 (264) Origin-Host
        Flags:     0x40       (64)  [M]
        Length:    0x00004f   (79)
        Data: 0004-diamproxy.MMEC001.MMEGI32000.MME.EPC.MNC0XY.MCC404.3GPPNETWORK.ORG
     [M]  Origin-Realm
        Code:      0x00000128 (296) Origin-Realm
        Flags:     0x40       (64)  [M]
        Length:    0x00002d   (45)
        Data: MME.epc.mnc0XY.mcc404.3gppnetwork.org
     [M]  Destination-Realm
        Code:      0x0000011b (283) Destination-Realm
        Flags:     0x40       (64)  [M]
        Length:    0x000029   (41)
        Data: epc.mnc0XY.mcc404.3gppnetwork.org
     [M]  User-Name
        Code:      0x00000001 (1) User-Name
        Flags:     0x40       (64)  [M]
        Length:    0x000017   (23)
        Data: 404XY0000022222

The AIA message that is sent from HSS to MME is:

INBOUND>>>>>  From diamproxy:52 oxy_conn_mgmt.c:3406 (Callid 4c0ea07a) 08:42:11:109 Eventid:81991(5)
Diameter message from 10.5.40.X:6000 to 10.0.231.Y:49417
  Base Header Information:
   Version:            0x01        (1)
   Message Length:     0x000110    (272)
   Command Flags:      0x40        (64)  PXY 
   Command Code:       0x00013e    (318) Authentication-Information-Answer
   Application ID:     0x01000023  (16777251)   3GPP-S6a
   Hop2Hop-ID:         0xadb40545  (2914256197)
   End2End-ID:         0x2cafadd5  (749710805)
  AVP Information:
     [M]  Session-Id
        Code:      0x00000107 (263) Session-Id
        Flags:     0x40       (64)  [M]
        Length:    0x000069   (105)
        Data: 0004-diamproxy.MMEC001.MMEGI32000.MME.EPC.MNC0XY.MCC404.3GPPNET;1276027002;2496613;5c204e8b-16502
     [M]  Auth-Session-State
        Code:      0x00000115 (277) Auth-Session-State
        Flags:     0x40       (64)  [M]
        Length:    0x00000c   (12)
        Data: NO_STATE_MAINTAINED (1)
     [M]  Origin-Host
        Code:      0x00000108 (264) Origin-Host
        Flags:     0x40       (64)  [M]
        Length:    0x000033   (51)
        Data: hss101.epc.mnc0XY.mcc404.3gppnetwork.org
     [M]  Origin-Realm
        Code:      0x00000128 (296) Origin-Realm
        Flags:     0x40       (64)  [M]
        Length:    0x000029   (41)
        Data: epc.mnc0XY.mcc404.3gppnetwork.org
     [M]  Result-Code
        Code:      0x0000010c (268) Result-Code
        Flags:     0x40       (64)  [M]
        Length:    0x00000c   (12)
        Data: DIAMETER_MISSING_AVP (5005)               >>DIAMETER_MISSING_AVP(5005)received from HSS
     [M]  Failed-AVP
        Code:      0x00000117 (279) Failed-AVP
        Flags:     0x40       (64)  [M]
        Length:    0x000018   (24)
         [V] [M]  Visited-PLMN-Id
            Code:      0x0000057f (1407) Visited-PLMN-Id
            Flags:     0xc0       (192) [V]  [M]
            Length:    0x00000d   (13)
            Vendor-Id: 0x000028af (10415) 3GPP
            Data: 0x00

As per the mon sub trace, the error "DIAMETER_MISSING_AVP (5005)" is received for 0004-diamproxy, which is associated with DPC card 2 only.

[local]SGSN-MME-03# show diameter  peers full endpoint DRA1 | grep -i -E "CPU|LOCAL HOST"
Monday December 24 11:34:47 IST 2018
  Local Hostname: 0001-diamproxy.MMEC001.MMEGI32000.MME.EPC.MNC0XY.MCC404.3GPPNETWORK.ORG
  CPU: 8/1                                Task: diamproxy-49
  Local Hostname: 0002-diamproxy.MMEC001.MMEGI32000.MME.EPC.MNC0XY.MCC404.3GPPNETWORK.ORG
  CPU: 9/1                                Task: diamproxy-50
  Local Hostname: 0003-diamproxy.MMEC001.MMEGI32000.MME.EPC.MNC0XY.MCC404.3GPPNETWORK.ORG
  CPU: 3/1                                Task: diamproxy-51
  Local Hostname: 0004-diamproxy.MMEC001.MMEGI32000.MME.EPC.MNC0XY.MCC404.3GPPNETWORK.ORG
  CPU: 2/1                                Task: diamproxy-52
  Local Hostname: 0005-diamproxy.MMEC001.MMEGI32000.MME.EPC.MNC0XY.MCC404.3GPPNETWORK.ORG
  CPU: 4/1                                Task: diamproxy-53
  Local Hostname: 0006-diamproxy.MMEC001.MMEGI32000.MME.EPC.MNC0XY.MCC404.3GPPNETWORK.ORG
  CPU: 7/1                                Task: diamproxy-54
  Local Hostname: 0001-diamproxy.MMEC001.MMEGI32000.MME.EPC.MNC0XY.MCC404.3GPPNETWORK.ORG
  CPU: 8/1                                Task: diamproxy-49
  Local Hostname: 0002-diamproxy.MMEC001.MMEGI32000.MME.EPC.MNC0XY.MCC404.3GPPNETWORK.ORG
  CPU: 9/1                                Task: diamproxy-50
  Local Hostname: 0003-diamproxy.MMEC001.MMEGI32000.MME.EPC.MNC0XY.MCC404.3GPPNETWORK.ORG
  CPU: 3/1                                Task: diamproxy-51
  Local Hostname: 0004-diamproxy.MMEC001.MMEGI32000.MME.EPC.MNC0XY.MCC404.3GPPNETWORK.ORG
  CPU: 2/1                                Task: diamproxy-52
  Local Hostname: 0005-diamproxy.MMEC001.MMEGI32000.MME.EPC.MNC0XY.MCC404.3GPPNETWORK.ORG
  CPU: 4/1                                Task: diamproxy-53
  Local Hostname: 0006-diamproxy.MMEC001.MMEGI32000.MME.EPC.MNC0XY.MCC404.3GPPNETWORK.ORG
  CPU: 7/1                                Task: diamproxy-54
[local]SGSN-MME-03#

It seems to be 'mme-hss-user-unknown' disconnect reason is increased for those sessmgr instance which instance associated with DPC card 2 only.

******** show task resources *******
                   task   cputime        memory     files     sessions
cpu facility      instused  allc   usedalloc used allc  used  allc S status
----------------------- ----------- ------------- --------- ------------- ------
 ..
2/1 sessmgr        749 3.07%  100% 355.0M 900.0M  173500   881 12000 I   good
2/1 sessmgr        762 2.86%  100% 353.3M 900.0M  171500   881 12000 I   good
<additional outputs supressed>

Disconnect reason for smgr-instance 749:
[local]SGSN-MME-03# show session disconnect-reasons smgr-instance 749|grep -i hss-us
Monday December 24 13:45:17 IST 2018
mme-hss-user-unknown                                          788     8.97597
[local]SGSN-MME-03# show session disconnect-reasons smgr-instance 749|grep -i hss-us
Monday December 24 13:45:19 IST 2018
mme-hss-user-unknown                                          790     8.99158
-------------------- -
Disconnect reason for smgr-instance 762:
[local]SGSN-MME-03# show session disconnect-reasons smgr-instance 762|grep -i hss-us
Monday December 24 13:45:26 IST 2018
mme-hss-user-unknown                                          743     8.16125
[local]SGSN-MME-03# show session disconnect-reasons smgr-instance 762|grep -i hss-us
Monday December 24 13:45:31 IST 2018
mme-hss-user-unknown                                          744     8.16147
[local]SGSN-MME-03# show session disconnect-reasons smgr-instance 762|grep -i hss-us
Monday December 24 13:45:32 IST 2018
mme-hss-user-unknown                                          749     8.20732
[local]SGSN-MME-03# show session disconnect-reasons smgr-instance 762|grep -i hss-us
Monday December 24 13:45:34 IST 2018
mme-hss-user-unknown                                          750     8.20659

When checked further, the supported vendor IDs had been 'none' for the HSS peer with DPC card 2.

[local]SGSN-MME-03# show diameter peers full peer-host dra01.epc.mnc0XY.mcc404.3gppnetwork.org

-------------------------------------------------------------------------------
Context: s6a                             Endpoint: HSS_DRA01 
-------------------------------------------------------------------------------
Peer Hostname: dra01.epc.mnc0xy.mcc404.3gppnetwork.org
  Local Hostname: 0004-diamproxy.MMEC001.MMEGI32000.MME.EPC.MNC0XY.MCC404.3GPPNETWORK.ORG
  Peer Realm: epc.mnc0XY.mcc404.3gppnetwork.org
  Local Realm: MME.epc.mnc0XY.mcc404.3gppnetwork.org
  Peer Address: 10.5.40.X:6000
  State: OPEN [SCTP]
  CPU: 2/1                                Task: sessmgr-4                      
  Messages Out/Queued: H0.L0/H0.L0     
  Supported Vendor IDs: None                          >> Supported Vendor IDs: none instead of 10415
  Admin Status: Enable
  DPR Disconnect: N/A
  Peer Backoff Timer running:N/A
-----------
Peer Hostname: dra01.epc.mnc0xy.mcc404.3gppnetwork.org
  Local Hostname: 0004-diamproxy.MMEC001.MMEGI32000.MME.EPC.MNC0XY.MCC404.3GPPNETWORK.ORG
  Peer Realm: epc.mnc0XY.mcc404.3gppnetwork.org
  Local Realm: MME.epc.mnc0XY.mcc404.3gppnetwork.org
  Peer Address: 10.5.40.X:6000
  State: OPEN [SCTP]
  CPU: 2/2                                Task: sessmgr-8                      
  Messages Out/Queued: H0.L0/H0.L0     
  Supported Vendor IDs: None                          >> Supported Vendor IDs: none instead of 10415
  Admin Status: Enable
  DPR Disconnect: N/A
  Peer Backoff Timer running:N/A
------------
Peer Hostname: dra01.epc.mnc0xy.mcc404.3gppnetwork.org
  Local Hostname: 0004-diamproxy.MMEC001.MMEGI32000.MME.EPC.MNC0XY.MCC404.3GPPNETWORK.ORG
  Peer Realm: epc.mnc0XY.mcc404.3gppnetwork.org
  Local Realm: MME.epc.mnc0XY.mcc404.3gppnetwork.org
  Peer Address: 10.5.40.X:6000
  State: OPEN [SCTP]
  CPU: 2/0                                Task: sessmgr-15                     
  Messages Out/Queued: H0.L0/H0.L0     
  Supported Vendor IDs: None                          >> Supported Vendor IDs: none instead of 10415
  Admin Status: Enable
  DPR Disconnect: N/A
  Peer Backoff Timer running:N/A
------------
Peer Hostname: dra01.epc.mnc0xy.mcc404.3gppnetwork.org
  Local Hostname: 0004-diamproxy.MMEC001.MMEGI32000.MME.EPC.MNC0XY.MCC404.3GPPNETWORK.ORG
  Peer Realm: epc.mnc0XY.mcc404.3gppnetwork.org
  Local Realm: MME.epc.mnc0XY.mcc404.3gppnetwork.org
  Peer Address: 10.5.40.X:6000
  State: OPEN [SCTP]
  CPU: 2/0                                Task: sessmgr-20                      
  Messages Out/Queued: H0.L0/H0.L0     
  Supported Vendor IDs: None                          >> Supported Vendor IDs: none instead of 10415
  Admin Status: Enable
  DPR Disconnect: N/A
  Peer Backoff Timer running:N/A
------------
Peer Hostname: dra01.epc.mnc0xy.mcc404.3gppnetwork.org
  Local Hostname: 0004-diamproxy.MMEC001.MMEGI32000.MME.EPC.MNC0XY.MCC404.3GPPNETWORK.ORG
  Peer Realm: epc.mnc0XY.mcc404.3gppnetwork.org
  Local Realm: MME.epc.mnc0XY.mcc404.3gppnetwork.org
  Peer Address: 10.5.40.X:6000
  State: OPEN [SCTP]
  CPU: 2/1                                Task: sessmgr-27                     
  Messages Out/Queued: H0.L0/H0.L0     
  Supported Vendor IDs: None                          >> Supported Vendor IDs: none instead of 10415
  Admin Status: Enable
  DPR Disconnect: N/A
  Peer Backoff Timer running:N/A

<additional outputs supressed>

Solution

It seems that the "Supported Vendor IDs" AVP is not negotiated with DPC Card 2 and so the failure is observed for that card only.

As per the RFC 3588,
Supported-Vendor-Id AVP - This is used in the CER and CEA messages in order to inform the peer that the sender supports (a subset of) the vendor-specific AVPs defined by the vendor identified in this AVP.
Vendor-Id AVP - In combination with the Supported-Vendor-Id AVP, this might be used in order to know which vendor-specific attributes might be sent to the peer.

In order to exchange the capabilities between diameter peer and client, this action plan is suggested to the service provider.

The action plan is to migrate DPC Card 2 with standby DPC Card 10.

[local]SGSN-MME-03# card migrate from 2 to 10 
Are you sure? [Yes|No]: yes

The service provider performed DPC Card 2 migration with standby DPC card 10.

Post activity, the supported vendor IDs(10415) appeared to be ok for card 10 with the respective hss-peer and the ASR KPI seemed to be ok too.

[local]SGSN-MME-03# show diameter peers full peer-host dra01.epc.mnc0XY.mcc404.3gppnetwork.org

-------------------------------------------------------------------------------
Context: s6a                             Endpoint: HSS_DRA01 
-------------------------------------------------------------------------------
Peer Hostname: dra01.epc.mnc0xy.mcc404.3gppnetwork.org
  Local Hostname: 0004-diamproxy.MMEC001.MMEGI32000.MME.EPC.MNC0XY.MCC404.3GPPNETWORK.ORG
  Peer Realm: epc.mnc0XY.mcc404.3gppnetwork.org
  Local Realm: MME.epc.mnc0XY.mcc404.3gppnetwork.org
  Peer Address: 10.5.40.X:6000
  State: OPEN [SCTP]
  CPU: 10/1                               Task: sessmgr-4                      
  Messages Out/Queued: H0.L0/H0.L0     
  Supported Vendor IDs: 10415                          >> Supported Vendor IDs: 10415 
  Admin Status: Enable
  DPR Disconnect: N/A
  Peer Backoff Timer running:N/A
------------
  Peer Hostname: dra01.epc.mnc0xy.mcc404.3gppnetwork.org
  Local Hostname: 0004-diamproxy.MMEC001.MMEGI32000.MME.EPC.MNC0XY.MCC404.3GPPNETWORK.ORG
  Peer Realm: epc.mnc0XY.mcc404.3gppnetwork.org
  Local Realm: MME.epc.mnc0XY.mcc404.3gppnetwork.org
  Peer Address: 10.5.40.X:6000
  State: OPEN [SCTP]
  CPU: 10/0                               Task: sessmgr-15                     
  Messages Out/Queued: H0.L0/H0.L0     
  Supported Vendor IDs: 10415                          >> Supported Vendor IDs: 10415
  Admin Status: Enable
  DPR Disconnect: N/A
  Peer Backoff Timer running:N/A
------------
Peer Hostname: dra01.epc.mnc0xy.mcc404.3gppnetwork.org
  Local Hostname: 0004-diamproxy.MMEC001.MMEGI32000.MME.EPC.MNC0XY.MCC404.3GPPNETWORK.ORG
  Peer Realm: epc.mnc0XY.mcc404.3gppnetwork.org
  Local Realm: MME.epc.mnc0XY.mcc404.3gppnetwork.org
  Peer Address: 10.5.40.X:6000
  State: OPEN [SCTP]
  CPU: 10/1                               Task: sessmgr-27                      
  Messages Out/Queued: H0.L0/H0.L0     
 Supported Vendor IDs: 10415                          >> Supported Vendor IDs: 10415
  Admin Status: Enable
  DPR Disconnect: N/A
  Peer Backoff Timer running:N/A
------------
Peer Hostname: dra01.epc.mnc0xy.mcc404.3gppnetwork.org
  Local Hostname: 0004-diamproxy.MMEC001.MMEGI32000.MME.EPC.MNC0XY.MCC404.3GPPNETWORK.ORG
  Peer Realm: epc.mnc0XY.mcc404.3gppnetwork.org
  Local Realm: MME.epc.mnc0XY.mcc404.3gppnetwork.org
  Peer Address: 10.5.40.X:6000
  State: OPEN [SCTP]
  CPU: 10/2                               Task: sessmgr-29                     
  Messages Out/Queued: H0.L0/H0.L0     
  Supported Vendor IDs: 10415                          >> Supported Vendor IDs: 10415
  Admin Status: Enable
  DPR Disconnect: N/A
  Peer Backoff Timer running:N/A

<additional outputs supressed>

The supported vendor IDs should be of '10415' value when the diameter peer connection is established between MME and HSS in order to exchange the operational diameter messages.

Contributed by Cisco Engineers

Tushar Patel
Cisco TAC Engineer

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Troubleshoot 4G ASR KPI Degradation due to an Increase in mme-hss-user-unknown Disconnect Reason

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Introduction

Prerequisites

Requirements

Components Used

Abbreviations

Problem

Troubleshoot

Solution

Contributed by Cisco Engineers

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