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Cisco Bug: CSCus91667 - Dynamic MAC listed in hardware mac table but not in 'show mac add'

Last Modified

Feb 01, 2017

Products (1)

  • Cisco Unified Computing System

Known Affected Releases

3.0(1d)A

Description (partial)

Symptom:
vMotion doesn't work after losing 1 of the individual uplinks from UCS to upstream device.

Conditions:
UCS Mini with more than 1 uplink from FI to 5k, not in a port channel.
After downing one of the uplinks on either fabric side, vMotion no longer works, though vmkping does still.

VMK Mac address is learned on 'hardware' mac table but not listed in 'software' mac table.

#show platform fwm info mac 0050.5666.a835 200  
mac vlan 1.200: could not find mac address
THIS IS A DELETED MAC ADDRESS

but shows up in 

#show hard int lib mtc l2 mac-table-ce valid-only

Bringing the 'downed' link back online restores connectivity.
Removing ALL links on the same fabric fails over to vNIC on other fabric properly.
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