Cisco NX-OS FCoE Configuration Guide for Nexus 7000 and MDS 9000
Guidelines and Limitations
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Guidelines and Limitations

Guidelines and Limitations

This chapter includes the following sections:

Verified Limits for FCoE for the Cisco Nexus 7000 Series and Cisco MDS 9000

The configuration limits are documented in the Cisco Nexus 7000 Series NX-OS Verified Scalability Guide.

Cisco Nexus 7000: Guidelines and Limitations

  • You cannot enable FCoE on default VLAN.

  • The QoS policy must be the same on all Cisco FCoE switches in the network.

  • Beginning with Cisco NX-OS Release 6.1, FCoE is supported on F2 and F2e Series modules.

    • FCoE supports only F2e (SFP+) modules.

    • FCoE does not support F2e (Copper) modules.

  • Beginning with Cisco NX-OS Release 7.2(0)D1(1), FCoE is supported on the following F3 Series modules:
    • Cisco Nexus 7700 F3 Series 48-port 1/10-Gigabit Ethernet (SFP+) module (PID: N77-F348XP-23)

    • Cisco Nexus 7700 F3 Series 24-port 40-Gigabit Ethernet (QSFP+) module (PID: N77-F324FQ-25)

    • Cisco Nexus 7000 F3 Series 12-port 40-Gigabit Ethernet (QSFP+) module (PID: N7K-F312FQ-25)


FCoE in a dedicated storage VDC has the following guidelines:

  • Enable the FCoE feature set in only one VDC.

  • Create VLANs in the FCoE allocated VLAN range.

  • Do not enable any other features other than storage-related features in the dedicated FCoE VDC.

  • Allocate resources for the dedicated FCoE VDC from an F Series module, such as the 32-port 10-Gigabit Ethernet I/O module (PID N7K-F132XP-15) .

  • Rollback is not supported in a storage VDC.

  • For Cisco NXOS Release 7.2(0)D1(1), ports from only 24 FEXes can be shared to storage VDC. System will not restrict the user to go beyond 24 but, more than 24 is not tested and not supported.

  • FCoE support on F2,F2e and F3 Series modules, requires Supervisor 2E module (N77-SUP2E for Cisco Nexus 7700 Series devices and N7K-SUP2E for Cisco Nexus 7000 Series devices).

  • F3 Fiber Channel over Ethernet (FCoE) feature licensing is supported from 7.2.0 release onwards. To downgrade to the older version of the image 6.2.x, first uninstall the F3 FCoE license and then proceed. For more information about licensing, refer Cisco NX-OS Licensing Guide.

  • F2 , F2e and F3 Series modules can co-exist in the same VDC . This applies to both LAN and storage VDCs.

  • F1 and F3 Series modules cannot co-exist in the same VDC . This applies to both LAN and storage VDCs.

  • F1 and F2 series modules cannot exist in the same VDC. This applies to both LAN and storage VDCs.

  • Use the limit-resource module-type command in the admin or default VDC to assign module resources such as F1, F2, F2e and F3 to a storage VDC. The supported line card modules are F1, F2, F2e and F3.

  • FEX is not supported with F3 series modules.

Shared Interfaces


  • Any change in protocol state that flaps the parent port of a shared interface because of any port feature also affects the FCOE traffic on the storage vdc.

  • 1500 MTU do not carry FCOE traffic in all FCOE supported platforms.

The following interface config modes are not allowed while sharing an interface from Ethernet vdc to a storage vdc:

  • SPAN destination

  • Private VLAN mode

  • Port-channel interfaces

  • Access mode

  • mac-packet-classify

  • Interfaces that are part of a VLAN that has an associated QoS policy

Shared Ethernet interfaces must be in trunk mode and only shared with one other VDC.

Storage VDC

Configuring a VDC for the Out-Of-Band (OOB) management interface mgmt0 is accomplished with the vrf context management command. However, a storage VDC does not support VRF, so configuring mgmt0 requires a different approach.

The following table shows how to configure mgmt 0 for a VDC and for a storage VDC:

Configuring mgmt 0 for VDC Configuring mgmt 0 for storage VDC
vrf context management
ip route default_gateway
interface mgmt 0
ip address mgmt0_ip_address mgmt0_subnet_mask
no shut
ip route default_gateway

The ip route command specifies the default route that points to the default gateway.


  • mgmt0_ip_address is the mgmt0 IPv4 address.

  • mgmt0_subnet_mask is the mgmt0 IPv4 netmask.

  • default_gateway is the IPv4 address of the default-gateway.

For more information about VDC, see the Cisco Nexus 7000 Series NX-OS Virtual Device Context Configuration Guide.

Cisco MDS 9000 Series: Guidelines and Limitations

  • You cannot enable FCoE on the default VLAN.

  • You can only enable FCoE on an FCoE module. However, this does not apply to MDS 9250i switch.

  • The QoS policy must be the same on all Cisco FCoE switches in the network.

  • Cisco MDS 9700 Series, MDS 9500 Series, and 9250i switch do not support LAN traffic and only accepts and processes FCoE frames.

  • On Cisco MDS 9500 Series, you must install a Supervisor-2A module to configure FCoE.

  • You can install an FCoE module in a fabric that uses FC-Redirect services but do not install the FCoE module in the same switch where FC-Redirect services application modules are enabled.

  • SME does not support any FCoE connected devices including devices connected through the MDS FCoE linecard (DX-X9708-K9)

  • In Cisco MDS NX-OS Release 5.2(x), you cannot install a FCoE module in a switch that is running DMM, SME, or IOA.

  • Cisco MDS 9250i supports a maximum number of up to 32 VSANs.

  • MDS 9250i does not support FCoE Switched Port Analyzer (SPAN).

  • MDS 9250i does not support FCoE port diagnostics, such as generic online diagnostics (GOLD) and Online Health Management System (OHMS).

  • Cisco MDS 9500 Series and MDS 9700 Series do not support F3 Series modules.

  • FCoE over F3 Series modules is not supported on the Supervisor 1 module.