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Cisco Bug: CSCuo56858 - Multicast IRB TM drops when traffic rate above 50% of line rate

Last Modified

Feb 12, 2018

Products (7)

  • Cisco ASR 9000 Series Aggregation Services Routers
  • Cisco ASR 9922 Router
  • Cisco IOS XR Software
  • Cisco ASR 9010 Router
  • Cisco ASR 9006 Router
  • Cisco ASR 9001 Router
  • Cisco ASR 9912 Router

Known Affected Releases

4.3.4.MCAST

Description (partial)

Symptom:
Multicast IRB traffic is dropped by the TM on ingress. 

The input drops matching NP TM drops and can be verified using "show controllers np tm counters npX location ...."

Conditions:
IRB traffic must have L2 and L3 receivers

IRB traffic rate * 2 + regular traffic rate must exceed interface line rate. 
 - example: 60% line rate IRB traffic * 2 = 120% (bad)
 - example: 40% line rate IRB traffic *2 + 40% unicast traffic  = 120% (bad)
 - example: 10% line rate IRB traffic * 2 + 50% unicast traffic = 70% (okay)
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
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