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Cisco Bug: CSCtd67034 - Various %CPPHA-3-FAULT errors with FRF.12 or MLP fragment reassembly

Last Modified

Feb 02, 2017

Products (1)

  • Cisco ASR 1000 Series Aggregation Services Routers

Known Affected Releases

12.2(33)XN

Description (partial)

Symptom:

ASR1K "%CPPHA-3-FAULT: F0: cpp_ha:  CPP:0 desc:..." and accompanying crash dump 
of the CPP QFP complex.

The various errors which have been seen in association with this problem include:  

  "%CPPHA-3-FAULT: F0: cpp_ha:  CPP:0 desc:..." 

where desc: could be any of the following errors:
  Desc: ETC_ETC_LOGIC1_LEAF_INT_INT_ETC_LKUP_DATA_ERR
  Desc: ETC_ETC_LOGIC2_LEAF_INT_INT_GPM_ENQ_VTL_DROP_ERR
  Desc: GAL_GAL_CSR_IPM_IF_GAL_IPM_IF_LEAF_INT_INT_IPM_ERR
  Desc: GRW_GPM_GRW_CSR_RDWR_UNIT_0_GPM_RW_LEAF_INT_INT_REQUEST_ERROR
  Desc: GRW_GPM_GRW_CSR_RDWR_UNIT_1_GPM_RW_LEAF_INT_INT_REQUEST_ERROR
  Desc: GRW_GPM_GRW_CSR_RDWR_UNIT_2_GPM_RW_LEAF_INT_INT_REQUEST_ERROR
  Desc: GRW_GPM_GRW_CSR_REQ_TOP_GPM_REQ_LEAF_INT_INT_MAP_ICREQ0_NO_CONTEXT
  Desc: OPM_OPM_INT_REGS_OPM_META_LEAF_INT_INT_UNDEF_DESC
  Desc: PQS_PQS_LOGIC1_INTR_LEAF_INT_INT_OUT_OF_RANGE_Q_ERR
  Desc: SRT_SRT_PAR_ERR_LEAF_INT_INT_STEM_0
Conditions:

A corner case issue was discovered where the FRF.12 (Frame Relay Fragmentation) 
and MLP (Multilink PPP) features were susceptible to various hardware detected error 
conditions when performing fragment reassembly for cases where the last fragment 
was a few bytes in length (approx. 4-8 bytes of payload after the protocol headers).  

This condition has only been seen with high traffic rates in conjunction with the small 
end fragment condition.
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