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Cisco Bug: CSCul24641 - ESP crashes due to BQS SRT stem memory parity interrupt

Last Modified

May 04, 2020

Products (1)

  • Cisco ASR 1000 Series Aggregation Services Routers

Known Affected Releases

15.3(2)S2.1 15.6(0.22)S0.15

Description (partial)

Symptom:
ESP crashes reporting BQS SRT Stem memory parity interrupt. 
SRT_SRT_PAR_ERR_LEAF_INT_INT_STEM_0
SRT_SRT_PAR_ERR_LEAF_INT_INT_STEM_1
HEDS_HED_HALTED_IN_63_0_LEAF_INT_INT_HALTED16

Conditions:
Due to the nature of this bug, it has only been observed under large scale
ANCP deployments where ANCP is doing adjustments on the grandparent shaper
rate. The hardware scheduler reacts to a very rare and unexpected confluence of events by reading a piece of internal memory that is unused and uninitialized. This leads to a non-recoverable parity error and causes a reload of the FP complex, which requires an ESP reload (modular chassis) or a chassis reload (consolidated chassis).

Only the following platforms may experience the issue.
ASR1001
ASR1002
ASR1002-Fixed
ASR1000 Series 5-Gbps Embedded Services Processor (ESP5)
ASR1000 Series 10-Gbps Embedded Services Processor (ESP10)
ASR1000 Series 10-Gbps Embedded Services Processor Non Crypto (ESP10-N)
ASR1000 Series 20-Gbps Embedded Services Processor (ESP20)
ASR1000 Series 40-Gbps Embedded Services Processor (ESP40)

The following platforms use different hardware and are not affected. 
ASR1002-X
ASR1001-X
ASR1000 Series 100-Gbps Embedded Services Processor (ESP100)
ASR1000 Series 200-Gbps Embedded Services Processor (ESP200)
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