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Cisco Bug: CSCun25245 - NLB mutlicast mac unicast IP duplicated by the CPU

Last Modified

Jun 04, 2018

Products (8)

  • Cisco Nexus 7000 Series Switches
  • Cisco Nexus 7000 10-Slot Switch
  • Cisco Nexus 7000 4-Slot Switch
  • Cisco Nexus 7700 6-Slot Switch
  • Cisco Nexus 7000 18-Slot Switch
  • Cisco Nexus 7700 18-Slot Switch
  • Cisco Nexus 7000 9-Slot Switch
  • Cisco Nexus 7700 10-Slot Switch

Known Affected Releases

6.2(2a) 6.2(6)

Description (partial) 

Symptom:
Packets with Unicast IP and Multicast MAC are being duplicated on the destination interface. which can cause performance issues to the application.

Conditions:
on using MS NLB Option 2: Static ARP + MAC-based L2 Multicast Lookups + Static Joins + IP Multicast MAC
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
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