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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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FCoE Maps

To identify the SAN fabric to which FCoE storage traffic is sent, use an FCoE map.

Using an FCoE map, an NPG operates as an FCoE-FC bridge between an FC SAN and FCoE network by providing FCoE-enabled servers and switches with the necessary parameters to log in to a SAN fabric.

An FCoE map applies the following parameters on server-facing Ethernet and fabric-facing FC ports:
  • The dedicated FCoE VLAN used to transport FCoE storage traffic.
  • The FC-MAP value used to generate a fabric-provided MAC address.
  • The association between the FCoE VLAN ID and FC fabric ID where the desired storage arrays are installed. Each Fibre Channel fabric serves as an isolated SAN topology within the same physical network.
  • A server uses the priority to select an upstream FCoE forwarder (FCF priority).
  • FIP keepalive (FKA) advertisement timeout.
  • NOTE: In each FCoE map, the fabric ID, FC-MAP value, and FCoE VLAN must be unique. To access one SAN fabric, use one FCoE map.

When you configure a switch as an NPG, FCoE transit with FIP snooping is automatically enabled and configured using the parameters in the FCoE map applied to server-facing Ethernet and fabric-facing FC interfaces.

After you apply an FCoE map on an FC port, when you enable the port (using the no shutdown command), the NPG starts sending FIP multicast advertisements on behalf of the FC port to downstream servers to advertise the availability of a new FCF port on the FCoE VLAN. The FIP advertisement also contains a keepalive message to maintain connectivity between a SAN fabric and downstream servers.

  • NOTE: After removing and reapplying the fabric map or after modifying the FCoE map, the Fiber Channel (FC) devices do not re-login. To mitigate this issue, you must first run the shut command and then the no shutdown command on each member interface after you alter the FCOE map.

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