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Cisco Bug: CSCvt46570 - [BP-CUPS]: Huge checkpoint failure at Standby micro-checkpoint failures recovery record not found

Last Modified

Oct 07, 2020

Products (2)

  • Cisco ASR 5000 Series
  • Cisco ASR 5500

Known Affected Releases

21.16.c5 21.16.c5.74017 21.17.M0.73796 21.18.2 21.19.n2 21.19.n2.75956 21.19.n3 21.19.n3.76608 21.20.0 21.20.G0.75834 21.22.G0.77755

Description (partial)

In initial attach, MBReq is delayed by 10 sec from the MME for collapsed call and switchover during transient state.
This is leading to recovery failure and resulting in counter  "recovery-access-side-failure" increment.

In the initial attach scenario, "Modify Bearer Request" is arriving with 10 sec delay from the MME which is a significant delay. SGW recovery data is check pointed only when call is in FULLY CONNECTED state or Call should not be in transient state, but here call remains transient for 10 second. By this time recovery failure happens at the standby side in the absence of SGW recovery data and Collapsed(PGW+SGW) call becomes PGW call.

In short when MBReq is delayed and recovery happens at Standby before that, will results in counter 
"recovery-access-side- failure" increment.

In good/normal case, MBReq arrived without any delay and hence SGW recovery data got check pointed 
immediately at Active side without any failure.
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