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Cisco Bug: CSCun76916 - XBAR returns wrong MI value for L3 mcast over F2/F2e

Last Modified

Nov 27, 2020

Products (5)

  • CiscoPro Workgroup EtherSwitch Software
  • Cisco Nexus 7000 10-Slot Switch
  • Cisco Nexus 7000 4-Slot Switch
  • Cisco Nexus 7000 18-Slot Switch
  • Cisco Nexus 7000 9-Slot Switch

Known Affected Releases


Description (partial)

100% packet loss for multicast routed traffic for a egress vlan

This issue only applies to Nexus 7004, F2/F2e line cards and limited to multicast routed traffic
There are 8 groups
Group 1: 3/1-12
Group 2: 3/13-24
Group 3: 3/25-36
Group 4: 3/37-48
Group 5: 4/1-12
Group 6: 4/13-24
Group 7: 4/25-36
Group 8: 4/37-48

The egress vlan is being trunked on more than 6 groups, does not matter if they have receivers or not. You can check from show spanning-tree vlan x, show port-channel summary to make sure which ports are trunking the affected vlan.

Unicast Traffic or Layer 2 multicast traffic is not affected.
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