Cisco NX-OS FCoE Configuration Guide for Nexus 7000, MDS 9500 and MDS 9250i
Guidelines and Limitations
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Guidelines and Limitations

This chapter includes the following sections:

Verified Limits for FCoE for the Cisco Nexus 7000 Series and Cisco MDS 9500

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.

FCoE VDC

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 1- and 10-Gigabit Ethernet I/O module (PID N7K-F132XP-15) .
  • Rollback is not supported in a storage VDC.
  • FCoE support on F2 and F2e Series modules, SF248XP-25 requires Supervisor 2 module.
  • F2 and F2e series modules cannot exist in the same VDC with any other module type. This applies to both LAN and storage VDCs.

Shared Interfaces


Note


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.

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 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 0.0.0.0/0 default_gateway
interface mgmt 0
ip address mgmt0_ip_address mgmt0_subnet_mask
no shut
ip route 0.0.0.0/0 default_gateway
Note   

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

where

  • 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 9500 and MDS 9250i: Guidelines and Limitations

  • You cannot enable FCoE on the default VLAN.
  • You can only enable FCoE on an FCoE module. This does not apply to MDS 9250i.
  • The QoS policy must be the same on all Cisco FCoE switches in the network.
  • Cisco MDS 9500 does not support LAN traffic and only accepts and processes FCoE frames.
  • You must install a Supervisor-2A module to configure FCoE. This does not apply to MDS 9250i.
  • 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).