Command to Test Communication between FCF and Target

C.

The correct command to test communication between an FCF (Fibre Channel Forwarder) and a target in a Cisco Data Center Infrastructure is the "fcping" command, option C.

The fcping command is used to test the connectivity between a Fibre Channel endpoint (FCP - Fibre Channel Protocol) and a Fibre Channel Forwarder (FCF). It is similar to the ping command used in IP networks.

Here is an overview of the command and how it works:

• The fcping command sends a Fibre Channel ping request (FCP PING) from the source device to the destination device (FCF or FCP) to test the connectivity.
• The ping request is sent using the Fibre Channel fabric and the Fibre Channel addressing scheme.
• The FCF or FCP responds with a Fibre Channel ping response (FCP PING RESPONSE) to indicate that the destination device is reachable and responsive.
• If the FCP PING request is successful, the output will show the response time, the round trip time, and the number of packets sent and received.
• If the FCP PING request is unsuccessful, the output will show a failure message indicating the reason for the failure.

Therefore, if a user reports that they cannot reach from a UCS server to an FC storage array, the fcping command can be used to test the communication between the FCF and the storage array. This will help to determine if the connectivity issue is related to the Fibre Channel network or the storage array itself.