Addendum

• When the Dell Networking OS sends FC frames (the initial FLOGI or FLOGO messages), or converts
FLOGI to FDISC messages or processes any internally generated FC frames, the software computes
and verifies the FC cyclic redundancy check (CRC) value before sending the frame to FC ports.
• Fabric worldwide name (WWN) verification is available for eight FC ports. Single-switching WWN
capability is provided when the switch operates in NPIV mode.
• With FC Flex IO modules, you can connect the IOA in Simple MUX mode to a single fabric.
• With FC Flex IO modules on an IOA, the FC port speed is set to auto. The following parameters are
automatically configured on the ENode facing and FC ports
• Description: SAN_FABRIC
• Fabric-id: 1002
• Fcoe-vlan: 1002
• Fc-map: 0x0efc00
• Fcf-priority: 128
• Fka-adv-period: 8000mSec
• Keepalive: enable
• Vlan priority: 3
• On an IOA, the FCoE virtual local area network (VLAN) is automatically configured.
• With FC Flex IO modules on an IOA, the following DCB maps are applied on all of the ENode facing
ports.
• dcb-map: SAN_DCB_MAP
• priority-group 0 bandwidth 50 pfc off
• priority-group 1 bandwidth 50 pfc on
• priority-pgid 0 0 0 1 0 0 0 0
• On I/O Aggregrators, uplink failure detection (UFD) is disabled if FC Flex IO module is present to allow
server ports to communicate with the FC fabric even when the Ethernet upstream ports are not
operationally up.
• You must ensure that the NPIV functionality is enabled on the upstream switches that operate as FC
switches or FCoE forwarders (FCF) before you connect the FC port of the MXL or I/O Aggregator to
these upstream switches.
• While storage traffic traverses through FC Flex IO modules and the Ethernet uplink port-channel
status changes (with DCB enabled on an adjacent switch), FCoE traffic is disrupted. This problem does
not occur if Ethernet traffic is not involved and only FCoE traffic is transmitted. Also, if DCB on the
ToR switch is disabled, traffic disruption does not occur.
Port Numbering for FC Flex IO Modules
Even-numbered ports are at the bottom of the I/O panel and for modules odd-numbered ports are at the
top of the I/O panel. When installed in a PowerEdge M1000e Enclosure, the MXL 10/40GbE Switch and
Aggregator ports are numbered 33 to 56 from the bottom to the top of the switch. The following port
numbering convention applies to the FC Flex IO module:
• In expansion slot 0, the ports are numbered 41 to 44.
• In expansion slot 1, the ports are numbered 49 to 52.
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Understanding and Working of the FC Flex IO Modules