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Cisco Bug: CSCuj56671 - Session Abort from GTPU with HENB->HENB Handover for HENBGW

Last Modified

Dec 25, 2016

Products (1)

  • Cisco ASR 5000 Series

Known Affected Releases

15.0(14)

Description (partial)

Symptom:
Root Cause :  The root cause for this issue is the new changes in 15.0 from the GTPU module. We see Session abort from GTPU with  HENB->HENB Handover for HENBGW. Both Henbs are connected to the HENBGW. SGW will annouce same TEID for both source and tranget ENB. Here it belongs to different callids and same remote SGW teid. Because of this we see Session Abort from GTPU for the source Enb.

Conditions:
Scenario :  Attach --> IDFT Handover (idft delay 10 sec) --> Handover  from Henbto HENB --> Detach 

During this 10 sec interval where the UE is in IDFT phase, data traffic will be unsuccessful. 

The reason why data is not being transferred via indirect tunnel is explained below. During the handover we will have two separate clp. One for regular ue attach and other one for handover. During handover, with Hadnover Resource allocation, sgw/mme will send transparent teid/address to the target enb. In both the cases sgw/mme will send same transparent TEID because it belongs to same UE or clp. We will be creating gtpu tunnels from two different HENBGW local teids to the same SGW remote teid. Here it belongs to different callids and same remote SGW teid. Because of this we see Session Abort from GTPU for the source Enb.  Because of this we won't data traffic during IDF phase.
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