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Cisco Bug: CSCur38243 - MME discards EGTP_CREATE_INDIRECT_DATA_FORWARDING_TUNNEL_RSP

Last Modified

Jan 30, 2017

Products (1)

  • Cisco ASR 5000 Series

Known Affected Releases

17.0

Description (partial)

Symptom:
we tried an inter MME inter SGW S1 HO, the UE goes from MME(STAR41) E/// ENB, to MME STAR40 Huawei ENB.
The IDFT_CREATE and IDFT_RESPONSE procedure goes into loop because the MME discards the IDFT_RSP.

Conditions:
MME(STAR40) request only UL FTEID in IDFT_CREATE , the SGW responds with it's UL FTEID in IDFT_RSP. The MME rejects this response wih error:
Thursday October 23 2014
***CONTROL*** 14:09:19:389 Eventid:141009 
[mme-egress] Rcvd malformed EGTP_MSG_CREATE_INDIRECT_DATA_FWD_TUNNEL_RSP with sequence number:98980, from <10.2.192.220, Port:2123>. Message validation failed. Conditional IE missing: SGW downlink data forwarding TEID (Bearer Context). Action taken - Discarding the message. Hex dump follows: 
                        48a7 002a 8008 a0a4 0182 a400 0200 0200 
                        1000 5d00 1800 4900 0100 0502 0002 0010 
                        0057 0009 059c 8003 c093 ac1f df7e

If only uplink data FTEID is present then response message gets dropped
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