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Cisco Bug: CSCup87407 - Quad Sup720 VSS unicast flooding on orphaned ports

Last Modified

Jan 28, 2017

Products (1)

  • Cisco Catalyst 6000 Series Switches

Known Affected Releases

15.0(1)SY2

Description (partial)

Symptom:
Mac addresses off orphaned ports learned on Quad Sup720 VSS are showing unknown unicast flooding in MAC table:

F340.06.06-6500-2#sh mac address-table dynamic | i uni
    10  0010.0000.000e   dynamic  Yes         60   flood to vlan10 (unicast)
    11  0010.94c0.000a   dynamic  Yes          0   flood to vlan11 (unicast)

Conditions:
Upon creation of new Vlan, orphaned ports in that Vlan will show unknown unicast flood. Traffic flows must hash over ICS VSL links.
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