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Cisco Bug: CSCur27722 - vNIC Failover on Windows 2008R2 with NIC teaming only works first time

Last Modified

Aug 30, 2017

Products (1)

  • Cisco UCS Virtual Interface Card

Known Affected Releases

2.1(0.12) 2.1(0.9)

Description (partial)

Symptom:
Unexpected network connectivity loss to Windows 2008R2 SP1 host after its teamed NICs take multiple link flaps.

Conditions:
When the following criteria are met, you may experience a disruption in connectivity to a UCS blade behind the FI:
 - UCSM 2.2(2c)
 - B200M3 with VIC1240
 - Service Profile with 1 A-Side vNIC, 1 B-Side vNIC - no failover enabled.
 - NICs in Windows OS teamed with either: (driver 2.4.0.15)
            enictool -c "eth0" "eth1" -m 3
                or
            enictool -c "eth0" "eth1" -m 4  (Mode 4 - LACP - is not a recommended or supported configuration for B-series behind FI but exhibits same behavior here.)

 - Flap the A-Side, restore it. (works as expected)
 - Flap the B-Side, restore it. (works as expected)
 - Flap the A-Side again - connectivity loss. (Not expected.)
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Bug Details Include

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