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[Mobile Broadband Gateway] Explanation about the 'Parsing Mand/Cond IE Indication Failed, cause=86' SGW node GTP log message

  [KB23953] Show Article Properties


Summary:
This article provides information about the Parsing Mand/Cond IE Indication Failed, cause=86 SGW node GTP log message.
Symptoms:
On the MX Mobile Broadband Gateway, which is configured to function as a SGW node, the Parsing Mand/Cond IE Indication Failed, cause=86 error message is generated in the GTP log files. The following excerpt is a sample of the GTP log:

May 4 23:14:51.1422490 gtid: [17] tid: [10] Debug: gtp_preparse_rx_pkt is called

May 4 23:14:51.1422550 gtid: [17] tid: [10] Track: Received message len 224

May 4 23:14:51.1422666 gtid: [17] tid: [10] Track: 45 00 00 e0 01 6a 40 00 3f 11 0b e4 0a 17 0c 49 0b 17 0c 49

May 4 23:14:51.1422746 gtid: [17] tid: [10] Track: 08 4b 08 4b 00 cc e7 b2 48 20 00 c0 00 00 00 00 01 02 a0 00

May 4 23:14:51.1422954 gtid: [17] tid: [10] Track: 01 00 08 00 42 84 18 32 54 76 98 f0 4b 00 08 00 11 22 11 22

May 4 23:14:51.1423070 gtid: [17] tid: [10] Track: 44 55 44 00 56 00 0d 00 18 13 80 79 00 01 13 80 79 00 00 00

May 4 23:14:51.1423176 gtid: [17] tid: [10] Track: 01 53 00 03 00 13 80 79 52 00 01 00 06 4d 00 02 00 00 04 57

May 4 23:14:51.1423293 gtid: [17] tid: [10] Track: 00 09 00 8a 00 02 80 55 0a 17 0c 49 57 00 09 01 89 00 00 00

May 4 23:14:51.1423393 gtid: [17] tid: [10] Track: 00 c9 64 01 06 47 00 18 00 04 6c 74 65 31 06 6d 6e 63 30 38

May 4 23:14:51.1423480 gtid: [17] tid: [10] Track: 38 06 6d 63 63 32 34 34 04 67 70 72 73 80 00 01 00 00 63 00

May 4 23:14:51.1423577 gtid: [17] tid: [10] Track: 01 00 01 4f 00 05 00 01 00 00 00 00 7f 00 01 00 00 48 00 08

May 4 23:14:51.1423666 gtid: [17] tid: [10] Track: 00 00 00 27 10 00 00 27 10 5d 00 1f 00 49 00 01 00 05 50 00

May 4 23:14:51.1423750 gtid: [17] tid: [10] Track: 16 00 44 09 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

May 4 23:14:51.1423811 gtid: [17] tid: [10] Track: 00 00 00 00

May 4 23:14:51.1423866 gtid: [17] tid: [10] Debug: gtp_preparse_rx_pkt Parsing GTPV2 packet msg_type(32), SeqNumber(66208), TEID(0x0), Length(224) completed successfully

May 4 23:14:51.1423977 gtid: [17] tid: [10] Debug: gtp_fullparse_rx_pkt is called

May 4 23:14:51.1424966 gtid: [17] tid: [10] Peer [L 11.23.12.73, R 10.23.12.73, V 6] path mgmt config update

May 4 23:14:51.1425020 gtid: [17] tid: [10] Peer [L 11.23.12.73, R 10.23.12.73, V 6] path-mgmt status before update ha-state(2) non-desig-sp rst_ctr(0) ctrl(enable/not-running) data(disable/not-running)

May 4 23:14:51.1425059 gtid: [17] tid: [10] Peer [L 11.23.12.73, R 10.23.12.73, V 6] path-mgmt status after update ha-state(2) non-desig-sp rst_ctr(0) ctrl(enable/not-running) data(disable/not-running)

May 4 23:14:51.1425679 gtid: [17] tid: [10] Peer [L 11.23.12.73, R 10.23.12.73, V 6] Rcvd GTPv2 msg type 32 piggyback 0 in vrf 6 from pfe-id 1 vpfe-id 0

May 4 23:14:51.1425722 gtid: [17] tid: [10] Decode: Parsing GTPv2 message Create Session Request(32), teid 0x0, seqno 66208 parsed msg type 0

May 4 23:14:51.1425753 gtid: [17] tid: [10] Decode: Parsing IE IMSI (1) intf 6 instance 0 len 8 - parser type 0

May 4 23:14:51.1425784 gtid: [17] tid: [10] Decode: IMSI 244:88:1234567890

May 4 23:14:51.1425809 gtid: [17] tid: [10] Decode: Parsing IE MEI (75) intf 6 instance 0 len 8 - parser type 8

May 4 23:14:51.1425838 gtid: [17] tid: [10] Decode: IMEISV IE: 11221122:445544:00

May 4 23:14:51.1425863 gtid: [17] tid: [10] Decode: Parsing IE ULI (86) intf 6 instance 0 len 13 - parser type 18

May 4 23:14:51.1425892 gtid: [17] tid: [10] Decode: TAI IS Present

May 4 23:14:51.1425916 gtid: [17] tid: [10] Decode: ECGI IS Present

May 4 23:14:51.1425941 gtid: [17] tid: [10] Decode: ULI: 310:978 LAC 0 CI 0 SAC 0 RAC 0 TAC 1 eci 1

May 4 23:14:51.1425972 gtid: [17] tid: [10] Decode: Parsing IE Serving Network (83) intf 6 instance 0 len 3 - parser type 15

May 4 23:14:51.1426005 gtid: [17] tid: [10] Decode: Serving network: 310:978

May 4 23:14:51.1426030 gtid: [17] tid: [10] Decode: Parsing IE RAT Type (82) intf 6 instance 0 len 1 - parser type 14

May 4 23:14:51.1426059 gtid: [17] tid: [10] Decode: Parsed RAT Type IE: 6

May 4 23:14:51.1426082 gtid: [17] tid: [10] Decode: Parsing IE Indication (77) intf 6 instance 0 len 2 - parser type 10

May 4 23:14:51.1426110 gtid: [17] tid: [10] Decode: Indication: 4Indication DAF: 0, DTF: 0, HI: 0, OI: 0 ISRAI: 0, SGWCI: 0, CFSI: 0, CRSI: 0, PS: 0, SI: 0

May 4 23:14:51.1426144 gtid: [17] tid: [10] Decode: Parsing Mand/Cond IE Indication Failed, cause=86

May 4 23:14:51.1426168 gtid: [17] tid: [10] Decode: GTPV2 Packet Decoding Unsuccessful Cause 86

May 4 23:14:51.1426193 gtid: [17] tid: [10] Decode: fullparse: Parse error version(2) cause(86)

May 4 23:14:51.1426225 gtid: [17] tid: [10] Encode: Encoding GTP V2 Header msg type 33

May 4 23:14:51.1426250 gtid: [17] tid: [10] Encode: Msg Type 33 P:0 SeqNumber 0x102a0 TEID 0x0

May 4 23:14:51.1426277 gtid: [17] tid: [10] Encode: Encoding CAUSE IE

May 4 23:14:51.1426300 gtid: [17] tid: [10] Encode: cause value: Protocol type not supported

May 4 23:14:51.1426333 gtid: [17] tid: [10] Track: Sending message len 46

May 4 23:14:51.1426387 gtid: [17] tid: [10] Track: 45 c0 00 2e 00 10 00 00 ff 11 8d 2f 0b 17 0c 49 0a 17 0c 49

May 4 23:14:51.1426441 gtid: [17] tid: [10] Track: 08 4b 08 4b 00 1a 00 00 48 21 00 0e 00 00 00 00 01 02 a0 00

May 4 23:14:51.1426474 gtid: [17] tid: [10] Track: 02 00 02 00 56 00

May 4 23:14:51.1426522 gtid: [17] tid: [10] Peer [L 11.23.12.73, R 10.23.12.73, V 6] No wait list!

May 4 23:14:51.1426593 gtid: [17] tid: [10] Debug: gtp_fullparse_rx_pkt is complete(error)


Cause:

Solution:
This error is due to the MME setting the PMIP bit in the Indication Information Element for the S5 interface. Currently, the Mobile Broadband Gateway SGW node does not support PMIP over the S5 interface.

The following excerpt is from the 3GPP TS29.274 specification:

"Bit 3 – PT (Protocol Type) If this bit set to 1, it shall indicate that the protocol type for the S5/S8 interface is PMIP; this bit is set to 0 to indicate that the protocol type for the S5/S8 interface is GTP."

A PCAP run on the S11 interface between the MME and the SGW, during this event, will show the Indication Information Element being sent from the MME to the SGW:
IE Type: Indication (77)
IE Length: 2
000. .... = CR flag: 0
.... 0000 = Instance: 0
0... .... = DAF (Dual Address Bearer Flag): False
.0.. .... = DTF (Direct Tunnel Flag): False
..0. .... = HI (Handover Indication): False
...0 .... = DFI (Direct Forwarding Indication): False
.... 0... = OI (Operation Indication): False
.... .0.. = ISRSI (Idle mode Signalling Reduction Supported Indication): False
.... ..0. = ISRAI (Idle mode Signalling Reduction Activation Indication): False
.... ...0 = SGWCI (SGW Change Indication): False
0... .... = SQCI (Subscribed QoS Change Indication: False
.0.. .... = UIMSI (Unauthenticated IMSI): False
..0. .... = CFSI (Change F-TEID support indication): False
...0 .... = CRSI (Change Reporting support indication):: False
.... 0... = PS (Piggybacking Supported).): False
.... .1.. = PT (Protocol Type): True
.... ..0. = SI (Scope Indication): False
.... ...0 = MSV (MS Validated): False
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