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Cisco Bug: CSCul26374 - SGW receives DL pkt for dedicated bearer on default bearer if fragmented

Last Modified

Jan 30, 2017

Products (1)

  • Cisco ASR 5000 Series

Known Affected Releases

15.0(1)

Description (partial)

Symptom:
The SGW CDR (SGWRECORD) generated for dedicated bearer (pDNConnectionID and chargingID will be different) will have 0 dataVolumeGSGPRSDownlink but dataVolumeGPRSUplink will be non-zero.
It can also be observed that the expected bytes in SGWRECORD for dedicated bearer in dataVolumeGPRSDownlink must have been added to dataVolumeGPRSDownlink of SGWRECORD of default bearer
Note:- It is very important to note that if the packet sent on dedicated bearer is such that before going out it gets fragmented then only this issue occurs

Conditions:
If a 4G call is setup and a dedicated bearer is setup either in CCAI,CCAU or RAR (with or without enabling monitoring key for the dynamic rule for dedicated bearer) and if TFT for dedicated bearer has remote address different than the one for default bearer, then if data is sent (a packet which gets fragmented before going out) on to remote address of dedicated bearer then downlink response packet goes onto default bearer.
This causes SGWRECORD with dataVolumeGSGPRSDownlink 0.
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