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Cisco Bug: CSCun63020 - SPGW racing condition between DBREQ and MME MBREQ

Last Modified

Jan 29, 2017

Products (1)

  • Cisco ASR 5000 Series

Known Affected Releases

14.0(40) 16.0(1)

Description (partial)

Symptom:
Race condition between SPGW DBREQ and MBREQ is not handled properly during  X2 HO causing MBREQ for EBI 6&7 to fail. SPGW sends CC73- No Resource Available error to both EBI=6 and 7. It should be only sending it for EBI=7.

Conditions:
Call flows:
- SPGW sends CBReq (with EBI=7) to MME
- SPGW receives CBRes (EBI=7) from MME
- SPGW sends DBReq (with EBI=7) to MME
- SPGW receives MBReq (with EBI=6 and EBI=7) from MME
- SPGW sends MBRes (for both EBI=6 and EBI=7) to MME with CC73-No resources available  <<<
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