OPERATIONAL DEFECT DATABASE
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An LACP team configured with ports of a Dell OEM network adapter may not fail over immediately when one port is disabled from within the OS. Several seconds may pass before IO resumes. In a Hyper-v cluster this may result in cluster services, with dependencies on the network, failing due to the amount of time it takes for IO to resume. This issue has been primarily observed in modular configurations such as the M1000e using an uplink from a Cisco FEX IOM to a Cisco Nexus switch. It has also been observed across NIC vendors.One observation made when the network port is disabled in the OS is that the network switch may continue to show the link up. This has led to the discovery that Dell OEM network adapters which support system management via iDRAC or LifeCycle Controller will continue to transmit sideband information which will cause an external Cisco switch to interpret this as link up even when the link in the OS is shut down. Note: This issue has not been observed with Ethernet Passthrough modules, Brocade, PowerConnect or Force10 switches. Hardware is working fine. Engineering is aware of this issue and indicate that this is working correctly. It is recommended to disable the switchport when manually testing failover instead of disabling the adapter from within Windows. Cisco Engineering is investigating the issue to determine exactly why they continue to detect a link when it is actually down.
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