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Cisco Bug: CSCul54111 - Core on ASR1002+ESP5 with QoS config

Last Modified

Mar 24, 2019

Products (1)

  • Cisco ASR 1000 Series Aggregation Services Routers

Known Affected Releases

15.2(4)S 15.3(3)S 15.4(1)S 15.4(1.6)S 15.4(2)S 15.4(3)S

Description (partial)

Symptom:
This issue causes the ESP to crash while applying QoS Model F. The issue occurs with both small and scaling configuration. The problem occurs all ESPs including ISR and CSRs.

Conditions:
The problem occurs with both small and large configurations. It is timing related as it occurs after running asynchronously in which case the code executes the deferral path which was not clear the event processing flags upon completion. When these flags are not cleared, the code treats the condition as fatal; hence the ESP crash.

While Model F is understood to be impacted by this problem it is conceivable this issue could occur with any configuration where the target interface handle for the policy is different from the parent interface handle, e.g. vlan queue on a GE interface.

Model F Sample Configuration:

policy-map grandparent
 class class-default
  shape average 10000000

class-map match-all p0
 match precedence 0 
class-map match-all p1
 match precedence 1 
class-map match-all p2
 match precedence 2 

policy-map child
 class p0
  priority
  police cir 2000000
 class p1
  bandwidth remaining ratio 10
 class class-default
  bandwidth remaining ratio 1

policy-map parent
 class class-default
   shape average 10000000
   bandwidth remaining ratio 1
   service-policy child

interface GigabitEthernet0/0/0.4
 encapsulation dot1Q 2
 service-policy output grandparent

The parent policy would typically be applied on a session on the vlan. The issue would typicall occur when the grandparent policy is processed on ESP.
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