Which of the following is true with respect to recovery from failure with automatic pinning that is
configured on a cluster of Cisco Unified Computing System 62XX Fabric Interconnects?
A.
By default, server MAC addresses are pinned to uplink interfaces using PIN groups.
B.
When a northbound fabric interconnect link goes down, the affected servers will use NIC
teaming to re-establish connectivity on the second fabric interconnect.
C.
When a northbound fabric interconnect link goes down, the fabric interconnect will send a
gratuitous ARP to the northbound switch to announce the servers on the new port.
D.
In the event that all uplink ports on the fabric interconnect lose connectivity, the 22XX I/O
module shuts down all of the host ports until at least one uplink is restored.
The answer is C
Each server is pinned to a single Fabric Interconnect uplink port or port channel. This means that the data traffic from some servers will move using Fabric Interconnect A and for other servers using Fabric Interconnect B. In case of a northbound uplink or port channel failure where a server is currently pinned to, the server connection will be automatically pinned to another port or port channel on the same Fabric Interconnect. In case of a complete Fabric Interconnect failure, the server will be automatically pinned to any uplink port or port channel on the second Fabric Interconnect provided that the Fabric failover is configured for the vNIC. The Fabric Interconnect will update the northbound switch about this change using Gratuitous Address Resolution Protocol (GARP). The dynamically pinned server vNIC uplinks are automatically rebalanced after 300 seconds to distribute the data traffic load on both Fabric Interconnects. No user configuration is required for dynamic pinning. If no static pin groups are configured, dynamic pinning will be automatically used. Dynamic pinning is the recommended configuration and static pinning should only be used for business use cases. Static Pinning In static pinning, LAN pin groups are defined by the administrator on Fabric Interconnects using UCSM, which can be assigned to vNICs or vNIC templates. Static pin groups are defined under the LAN tab of the UCSM – See more at: http://stretch-cloud.info/2014/01/pin-groups-in-cisco-ucs-demystified/#sthash.aSeCospg.dpuf