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

FCoE

This chapter includes the following sections:

Information About FCoE

FCoE provides a method of transporting Fibre Channel traffic over a physical Ethernet connection. FCoE requires the underlying Ethernet to be full duplex and to provide lossless behavior for Fibre Channel traffic.


Note


Lossless behavior on Ethernet is provided by using a priority flow control (PFC) mechanism that prevents packet loss during congestion conditions.


The Cisco NX-OS software supports T11-compliant FCoE on all 10-Gigabit Ethernet interfaces.

FCoE and FIP

FCoE Initiation Protocol

The FCoE Initialization Protocol (FIP) allows the switch to discover and initialize FCoE-capable entities that are connected to an Ethernet LAN. Cisco NX-OS switches support the Converged Enhanced Ethernet Data Center Bridging Exchange (CEE-DCBX) protocol for T11-compliant Generation 2 CNAs.

The following switches do not support Pre-FIP on Generation 1 CNAs:

  • Cisco Nexus 7000
  • Cisco MDS 9500
  • Cisco MDS 925i

FIP Virtual Link Instantiation

FIP is used to perform device discovery, initialization, and link maintenance. FIP performs the following tasks:

  • FIP VLAN discovery— Discovers the FCoE VLAN that will be used by all other FIP protocols as well as by the FCoE encapsulation for Fibre Channel payloads on the established virtual link. FIP VLAN discovery occurs in the native VLAN used by the initiator or target to exchange Ethernet traffic. The FIP VLAN discovery protocol is the only FIP protocol running on the native VLAN; all other FIP protocols run on the discovered FCoE VLANs.
  • FIP FCF discovery—When a FCoE device is connected to the fabric, it sends a Discovery Solicitation message. A Fibre Channel Forwarder (FCF) or a switch responds to the message with a Solicited Advertisement that provides an FCF MAC address to use for subsequent logins.
  • FCoE virtual link instantiation— FIP defines the encapsulation of fabric login (FLOGI), fabric discovery (FDISC), logout (LOGO), and exchange link parameter (ELP) frames along with the corresponding reply frames. The FCoE devices use these messages to perform a fabric login.
  • FCoE virtual link maintenance— FIP periodically sends maintenance messages between the switch and the CNA to ensure that the connection is still valid.

FCoE Frame Format

FCoE is implemented when the switch encapsulates a Fibre Channel frame in an Ethernet packet with a dedicated Ethernet type, 0x8906. The packet has a 4-bit version field. The other header fields in the frame (the source and destination MAC addresses, VLAN tags, and frame markers) are all standard Ethernet fields. Reserved bits pad the FCoE frame to the IEEE 802.3 minimum packet length of 64 bytes.

A Fibre Channel frame consists of 36 bytes of headers and up to 2112 bytes of data for a total maximum size of 2148 bytes. The encapsulated Fibre Channel frame has all the standard headers, which allow it to be passed to the storage network without further modification. To accommodate the maximum Fibre Channel frame in an FCoE frame, the class-fcoe is defined with a default Maximum Transmission Unit (MTU) of 2240 bytes.

VLAN Tagging for FCoE Frames

The Ethernet frames that are sent by the switch to the adapter include the IEEE 802.1Q tag. This tag includes a field for the class of service (CoS) value used by the priority flow control (PFC). The IEEE 802.1Q tag also includes a VLAN field.

The switch expects frames from a FIP T11-compliant CNA to be tagged with the VLAN tag for the FCoE VLAN. Frames that are not correctly tagged are discarded.


Note


You cannot map VLAN 1 or the native VLAN to an FCoE VSAN.


The following switches do not support Pre-FIP on Generation 1 CNAs:

  • Cisco Nexus 7000
  • Cisco MDS 9500
  • Cisco MDS 9250i

FIP Ethernet Frame Format

FIP is encapsulated in an Ethernet packet with a dedicated EtherType, 0x8914. The packet has a 4-bit version field. Along with the source and destination MAC addresses, the FIP packet also contains a FIP operation code and a FIP operation subcode. The following table describes the FIP operation codes and subcodes.

Table 1 FIP Operation Codes

FIP Operation Code

FIP Subcode

FIP Operation

0x0001

0x01

Discovery Solicitation

0x02

Discovery Advertisement

0x0002

0x01

Virtual Link Instantiation Request

0x02

Virtual Link Instantiation Reply

0x0003

0x01

FIP Keepalive

0x02

FIP Clear Virtual Links

0x0004

0x01

FIP VLAN Request

0x02

FIP VLAN Notification

DCBX

Data Center Bridging Exchange Protocol

The Data Center Bridging Exchange (DCBX) protocol is an extension of the Link Layer Discovery Protocol (LLDP). DCBX end points exchange request and acknowledgment messages. For flexibility, parameters are coded in a type-length-value (TLV) format. Cisco NX-OS switches support the Converged Enhanced Ethernet Data Center Bridging Exchange (CEE-DCBX) is supported on all T11-compliant Generation 2 CNAs.

DCBX runs on the physical Ethernet link between the switch and the CNA. By default, DCBX is enabled on Ethernet interfaces. When an Ethernet interface is brought up, the switch automatically starts to communicate with the CNA.

During the normal operation of FCoE between the switch and the CNA, DCBX provides link-error detection.

DCBX is also used to negotiate capabilities between the switch and the CNA and to send configuration values to the CNA.

The CNAs that are connected to a switch are programmed to accept the configuration values that are sent by the switch, allowing the switch to distribute configuration values to all attached CNAs, which reduces the possibility of configuration errors and simplifies CNA administration.

Lossless Ethernet

Standard Ethernet is a best-effort medium which means that it lacks any form of flow control. In the event of congestion or collisions, Ethernet drops packets. The higher level protocols detect the missing data and retransmit the dropped packets.

To properly support Fibre Channel, Ethernet has been enhanced with a priority flow control (PFC) mechanism.

Logical Link Up/Down

On a native Fibre Channel link, some configuration actions (such as changing the VSAN) require that you reset the interface status. When you reset the interface status, the switch disables the interface and then immediately reenables the interface.

Caution:

If an Ethernet link provides FCoE service, do not reset the physical link because this action is disruptive to all traffic on the link.

The logical link up/down feature allows the switch to reset an individual virtual link. The logical link down is signaled with a FIP Clear Virtual Link message.

Caution:

If the CNA does not support the logical link level up/down feature, the CNA resets the physical link, which means that all traffic on the Ethernet interface is disrupted.

Converged Network Adapters

Cisco NX-OS switches support the following CNA types:

  • Hardware adapter
    • Works with the existing Fibre Channel host bus adapter (HBA) driver and Ethernet Network Interface Card (NIC) driver in the server.
    • Server operating system view of the network is unchanged; the CNA presents a SAN interface and a LAN interface to the operating system.
  • FCoE software stack
    • Runs on existing 10-Gigabit Ethernet adapters.

The following Cisco NX-OS series and platforms support Generation 2 CNAs that use the FIP to exchange information about its available capabilities and to negotiate the configurable values with the switch:

  • Cisco Nexus 2232
  • Cisco Nexus 5000
  • Cisco Nexus 5500
  • Cisco Nexus 7000
  • Cisco MDS 9500
  • Cisco MDS 9250i

To reduce configuration errors and simplify administration, the switch distributes the configuration data to all the connected adapters.

STP Lite

FCoE does not require full Spanning Tree Protocol (STP) because FCoE has no bridging functionality, which means that no STP loops are created in the network. STP Lite on FCoE interfaces ensures rapid convergence across the network by sending an agreement Bridge Protocol Data Unit (BPDU) whenever it receives a proposal BPDU. The FCoE link sends the identical agreement BPDU in response to either an Multiple Spanning Tree (MST) or a Per VLAN Rapid Spanning Tree Plus (PVRST+) proposal BPDU. Additionally, STP Lite suppresses the MAC address flushing function for FCoE VLANs.

STP Lite is enabled automatically by default across the entire device for FCoE VLANs as soon as the first FCoE VLAN comes up. At the same time, the system automatically converts all FCoE links as the STP-type normal ports. This feature runs only in FCoE VLANs.

Default Settings for FCoE

This table lists the default settings for FCoE parameters.

Table 2  Default FCoE Parameter Settings

Parameters

Default

FCoE feature

Not installed, disabled

FC-Map

0E.FC.00

Fabric priority

128

Advertisement interval

8 seconds

Licensing Requirements for FCoE

Product License
Cisco Nexus 7000 Series Each F Series module that runs FCoE requires an FCoE license. FCoE enabled in a nondefault VDC does not require the Advanced Services License. For a complete explanation of the Cisco NX-OS licensing scheme and how to obtain and apply licenses, see the Cisco NX-OS Licensing Guide.
Cisco MDS 9500 Series FCoE does not require a license. For a complete explanation of the Cisco NX-OS licensing scheme and how to obtain and apply licenses, see the Cisco NX-OS Licensing Guide.

Guidelines and Limitations

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).

Configuring FCoE

Enabling FCoE

Cisco Nexus 7000: Enabling FCoE

You must install the FCoE feature set in the default VDC and enable dependent features in order to enable FCoE in a storage VDC.

Before You Begin
  • Ensure you are in the default VDC.
  • Ensure you have installed the correct license for your switch.
  • Do not enable FCoE on VLAN 1 or the native VLAN.
SUMMARY STEPS

    1.    configure terminal

    2.    install feature-set fcoe

    3.    feature lldp

    4.    (Optional) feature lacp

    5.    system qos

    6.    service-policy type network-qos policy-name

    7.    (Optional) show feature

    8.    (Optional) copy running-config startup-config


DETAILED STEPS
      Command or Action Purpose
    Step 1 configure terminal


    Example:
    switch# configure terminal
    switch(config)#
     

    Enters configuration mode.

     
    Step 2 install feature-set fcoe


    Example:
    switch(config)# install feature-set fcoe
     

    Installs the FCoE feature set in the default VDC.

     
    Step 3 feature lldp


    Example:
    switch(config)# feature lldp
     

    Enables the Link Layer Discovery Protocol (LLDP) feature in the default VDC. This feature is required for FCoE operation.

     
    Step 4 feature lacp


    Example:
    switch(config)# feature lacp
     
    (Optional)

    Enables the Link Aggregation Control Protocol (LACP) feature in the default VDC. This feature is considered a best practice for FCoE operation.

     
    Step 5 system qos


    Example:
    switch(config)# system qos
     

    Enters Quality of service (QoS) configuration mode.

     
    Step 6 service-policy type network-qos policy-name


    Example:
    switch(config-sys-qos)# service-policy type
     network-qos default-nq-7e-policy
     

    Enables the QoS policy that supports FCoE traffic. The policy-name default is default-nq-8e-policy.

     
    Step 7 show feature


    Example:
    switch(config-sys-qos)# show feature
     
    (Optional)

    Displays information about the enabled features.

     
    Step 8 copy running-config startup-config


    Example:
    switch(config-sys-qos)# copy running-config startup-config
     
    (Optional)

    Copies the running configuration to the startup configuration.

     
    What to Do Next

    You must create a storage VDC and allocate resources to finish enabling FCoE.

    Cisco MDS 9500 and MDS 9250i switch: Enabling FCoE

    The Cisco MDS 9500 switch and MDS 9250i switch automatically enable the FCoE feature when an FCoE-capable module is present in the chassis. You must enable supporting features and the appropriate QoS policy for FCoE.
    Before You Begin
    • Do not enable FCoE on VLAN 1 or the native VLAN.
    SUMMARY STEPS

      1.    configure terminal

      2.    (Optional) feature lacp

      3.    system qos

      4.    service-policy type network-qos policy-name

      5.    (Optional) show feature

      6.    (Optional) copy running-config startup-config


    DETAILED STEPS
        Command or Action Purpose
      Step 1 configure terminal


      Example:
      switch# configure terminal
      switch(config)#
       

      Enters configuration mode.

       
      Step 2 feature lacp


      Example:
      switch(config)# feature lacp
       
      (Optional)

      Enables the Link Aggregation Control Protocol (LACP) feature. This feature is considered a best practice for FCoE operation.

       
      Step 3 system qos


      Example:
      switch(config)# system qos
       

      Enters Quality of Service (QoS) configuration mode.

       
      Step 4 service-policy type network-qos policy-name


      Example:
      switch(config-sys-qos)# service-policy type
       network-qos default-nq-7e-policy
       

      Enables the QoS policy that supports FCoE traffic. The policy-name default is default-nq-6e-policy.

       
      Step 5 show feature


      Example:
      switch(config-sys-qos)# show feature
       
      (Optional)

      Displays information about the enabled features.

       
      Step 6 copy running-config startup-config


      Example:
      switch(config-sys-qos)# copy running-config startup-config
       
      (Optional)

      Copies the running configuration to the startup configuration.

       

      Disabling FCoE

      Cisco Nexus 7000: Disabling FCoE

      You can disable or uninstall the FCoE feature set. You can also disallow the FCoE feature set in a VDC.

      Before You Begin

      Ensure you are in the correct VDC.

      SUMMARY STEPS

        1.    configure terminal

        2.    vdc vdc_id type storage

        3.    (Optional) no allow feature-set fcoe

        4.    no feature-set fcoe

        5.    exit

        6.    no install feature-set fcoe

        7.    (Optional) show feature-set

        8.    (Optional) copy running-config startup-config


      DETAILED STEPS
          Command or Action Purpose
        Step 1 configure terminal


        Example:
        switch# configure terminal
        switch(config)#
         

        Enters configuration mode.

         
        Step 2 vdc vdc_id type storage


        Example:
        switch(config)# vdc fcoe type storage
        switch(config-vdc)#
         

        Enters VDC configuration mode. The vdc_id can be any case-sensitive, alphanumeric string up to 32 characters.

         
        Step 3 no allow feature-set fcoe


        Example:
        switch(config-vdc)# no allow feature-set fcoe
        switch(config-vdc)#
         
        (Optional)

        Disallows any FCoE in this VDC. The default is allow.

         
        Step 4 no feature-set fcoe


        Example:
        switch(config-vdc)# no feature-set fcoe
         

        Disables the FCoE feature set. The no feature-set fcoe command may take some time to complete if the size of the configuration is very large. The command must clean up all of the configuration associated with the FCoE feature set.

         
        Step 5 exit


        Example:
        switch(config-vdc)# exit
        switch(config)#
         

        Exits VDC configuration mode.

         
        Step 6 no install feature-set fcoe


        Example:
        switch(config)# no install feature-set fcoe
         

        Uninstalls the FCoE feature set. Use this command in the default VDC after you disable the FCoE feature set.

         
        Step 7 show feature-set


        Example:
        switch(config)# show feature-set
         
        (Optional)

        Displays information about the feature sets.

         
        Step 8 copy running-config startup-config


        Example:
        switch(config)# copy running-config startup-config
         
        (Optional)

        Copies the running configuration to the startup configuration.

         

        Cisco MDS 9500 and MDS 9250i: Disabling FCoE

        After you disable the FCoE feature, all FCoE commands are removed from the CLI and the FCoE configuration is deleted.

        SUMMARY STEPS

          1.    configure terminal

          2.    no feature-set fcoe


        DETAILED STEPS
            Command or Action Purpose
          Step 1 configure terminal


          Example:
          switch# configure terminal
          switch(config)#
           

          Enters configuration mode.

           
          Step 2 no feature-set fcoe


          Example:
          switch(config)# no feature-set fcoe
           

          Disables the FCoE feature set. The no feature-set fcoe command may take some time to complete if the size of the configuration is very large. The command must clean up all of the configuration associated with the FCoE feature set.

           

          This example shows how to disable FCoE on the switch:

          switch# configure terminal
          switch(config)# no feature-set fcoe
           

          Configuring the FC-Map

          You can prevent data corruption due to cross-fabric talk by configuring an FC-Map that identifies the Fibre Channel fabric for this switch. When the FC-Map is configured, the switch discards the MAC addresses that are not part of the current fabric. An FCF can assign Fabric Provide MAC Addresses (FPMA) to the CNAs consisting of the FC-Map Value for the Fabric and the Fibre Channel ID (FCID) assigned during Fabric Login


          Note


          For Cisco MDS 9500 switches and MDS 9250i switch, start at configure terminal below .


          Before You Begin

          For Cisco Nexus 7000 Series, you must be in the storage VDC to configure this feature.

          SUMMARY STEPS

            1.    (Cisco Nexus 7000) switchto vdc vdc-id type storage

            2.    configure terminal

            3.    fcoe fcmap fabric-map


          DETAILED STEPS
              Command or Action Purpose
            Step 1 (Cisco Nexus 7000) switchto vdc vdc-id type storage

            Example:
            switch# switchto vdc fcoe type storage
            fcoe#
             

            Switches to the storage VDC. The step is required for Cisco Nexus 7000 Series only.

             
            Step 2 configure terminal


            Example:
            fcoe# configure terminal
            fcoe(config)#
             

            Enters configuration mode.

             
            Step 3 fcoe fcmap fabric-map


            Example:
            fcoe(config)# fcoe fcmap 0x0efc2a
             

            Configures the global FC-Map. The default value is 0x0EFC00. The range is from 0x0EFC00 to 0x0EFCFF. Use the no fcoe map command to reset to the default value.

             

            This example shows how to configure the global FC-Map on a Cisco Nexus 7000 Series switch:

            switch# switchto vdc fcoe type storage
            fcoe# configure terminal
            fcoe(config)# fcoe fcmap 0x0efc2a
            
            

            This example shows how to configure the global FC-Map on a Cisco MDS 9500 or an MDS 9250i switch:

            switch# configure terminal
            switch(config)# fcoe fcmap 0x0efc2a
            
            

            Configuring the Fabric Priority

            The FCoE switch advertises its priority. The priority is used by the CNAs in the fabric to determine the best switch to connect to.


            Note


            For Cisco MDS 9500 switches and MDS 9250i switch, start at configure terminal below .


            Before You Begin

            For Cisco Nexus 7000 Series, you must be in the storage VDC to configure this feature.

            SUMMARY STEPS

              1.    (Cisco Nexus 7000) switchto vdc vdc-id type storage

              2.    configure terminal

              3.    fcoe fcf-priority fabric-priority


            DETAILED STEPS
                Command or Action Purpose
              Step 1 (Cisco Nexus 7000) switchto vdc vdc-id type storage

              Example:
              switch# switchto vdc fcoe type storage
              fcoe#
               

              Switches to the storage VDC. The step is required for Cisco Nexus 7000 Series only.

               
              Step 2 configure terminal


              Example:
              fcoe# configure terminal
              fcoe(config)#
               

              Enters configuration mode.

               
              Step 3 fcoe fcf-priority fabric-priority


              Example:
              fcoe(config)# fcoe fcf-priority 42
               

              Configures the global fabric priority. The default value is 128. The range is from 0 (higher) to 255 (lower). Use the no fcoe fcf-priority command to reset the global fabric priority to the default value.

               

              This example shows how to configure the global fabric priority for a Cisco Nexus 7000 Series switch:

              switch# switchto vdc fcoe type storage
              fcoe# configure terminal
              fcoe(config)# fcoe fcf-priority 42
              

              This example shows how to configure the global fabric priority for a Cisco MDS 9500 and MDS 9250i switch:

              switch# configure terminal
              switch(config)# fcoe fcf-priority 42
              
              

              Setting the Advertisment Interval

              You can configure the interval for Fibre Channel fabric advertisement on the switch.


              Note


              For Cisco MDS 9500 switches, start at configure terminal below .


              Before You Begin

              For Cisco Nexus 7000 Series, you must be in the storage VDC to configure this feature.

              SUMMARY STEPS

                1.    (Cisco Nexus 7000) switchto vdc vdc-id type storage

                2.    configure terminal

                3.    fcoe fka-adv-period interval


              DETAILED STEPS
                  Command or Action Purpose
                Step 1 (Cisco Nexus 7000) switchto vdc vdc-id type storage

                Example:
                switch# switchto vdc fcoe type storage
                fcoe#
                 

                Switches to the storage VDC. The step is required for Cisco Nexus 7000 Series only.

                 
                Step 2 configure terminal


                Example:
                fcoe# configure terminal
                fcoe(config)#
                 

                Enters configuration mode.

                 
                Step 3 fcoe fka-adv-period interval


                Example:
                fcoe(config)# fcoe fka-adv-period 8
                fcoe#
                 

                Configures the advertisement interval for the fabric. The default value is 8 seconds. The range is from 4 to 60 seconds.

                 

                This example shows how to configure the advertisement interval for the fabric on a Cisco Nexus 7000 Series switch:

                switch# switchto vdc fcoe type storage
                fcoe# configure terminal
                fcoe(config)# fcoe fka-adv-period 42
                
                

                This example shows how to configure the advertisement interval for the fabric on a Cisco MDS 9500 switch:

                switch# configure terminal
                switch(config)# fcoe fka-adv-period 42
                 

                Disabling LAN Traffic on an FCoE Link

                You can disable LAN traffic on an FCoE link.

                DCBX allows the switch to send a LAN Logical Link Status (LLS) message to a directly-connected CNA. Enter the shutdown lan command to send an LLS-Down message to the CNA. This command causes all VLANs on the interface that are not enabled for FCoE to be brought down. If a VLAN on the interface is enabled for FCoE, it continues to carry SAN traffic without any interruption.

                SUMMARY STEPS

                  1.    configure terminal

                  2.    interface ethernet slot/port

                  3.    shutdown lan

                  4.    (Optional) show interface

                  5.    (Optional) copy running-config startup-config


                DETAILED STEPS
                    Command or Action Purpose
                  Step 1 configure terminal


                  Example:
                  switch# configure terminal
                  switch(config)#
                   

                  Enters configuration mode.

                   
                  Step 2 interface ethernet slot/port


                  Example:
                  switch(config)# interface e 2/1
                  switch(config-if)#
                   

                  Specifies an interface to configure, and enters interface configuration mode. Use ? to view a list of supported interfaces.

                   
                  Step 3 shutdown lan


                  Example:
                  switch(config-if)# shutdown lan
                   

                  Shuts down Ethernet traffic on the interface. If the interface is part of an FCoE VLAN, the shutdown has no impact on the FCoE traffic. Use no shutdown lan to reenable Ethernet traffic on this interface.

                   
                  Step 4 show interface


                  Example:
                  switch(config-if)# show interface
                   
                  (Optional)

                  Displays information about the interface.

                   
                  Step 5 copy running-config startup-config


                  Example:
                  switch(config-if)# copy running-config startup-config
                   
                  (Optional)

                  Copies the running configuration to the startup configuration.

                   

                  Verifying the FCoE Configuration

                  To display FCoE configuration information, perform one of these tasks:

                  Command

                  Purpose

                  show fcoe

                  Displays whether FCoE is enabled on the switch.

                  show fcoe database

                  Displays the contents of the FCoE database.

                  show interface vfc [number]

                  Displays information about the vFC interfaces.

                  show interface [interface number] fcoe

                  Displays the FCoE settings for an interface or all interfaces.

                  This example shows how to verify that the FCoE capability is enabled:

                  switch# show fcoe
                  Global FCF details
                          FCF-MAC is 00:0d:ec:6d:95:00
                          FC-MAP is 0e:fc:00
                          FCF Priority is 128
                          FKA Advertisement period for FCF is 8 seconds
                  
                  

                  This example shows how to display the FCoE database:

                  switch# show fcoe database
                  ------------------------------------------------------------------------------
                  INTERFACE       FCID            PORT NAME               MAC ADDRESS
                  ------------------------------------------------------------------------------
                  vfc3            0x490100        21:00:00:1b:32:0a:e7:b8 00:c0:dd:0e:5f:76
                  
                  

                  This example shows how to display the FCoE settings for an interface.

                  switch# show interface ethernet 1/37 fcoe
                  Ethernet1/37 is FCoE UP
                      vfc3 is Up
                          FCID is 0x490100
                         PWWN is 21:00:00:1b:32:0a:e7:b8
                         MAC addr is 00:c0:dd:0e:5f:76
                  
                  

                  Additional References for FCoE

                  Related Documents

                  Related Topic Document Title

                  Command reference

                  Cisco NX-OS FCoE Command Reference for Cisco Nexus 7000 and Cisco MDS 9500

                  Cisco NX-OS licensing

                  Cisco NX-OS Licensing Guide

                  Standards and RFCs

                  Standard/RFC Title
                  T11 FC BB-5 Fibre Channel Backbone 5

                  MIBs

                  MIB MIBs Link
                   

                  To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL:

                  http:/​/​www.cisco.com/​go/​mibs

                  Technical Assistance

                  Description Link

                  The Cisco Support website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies.

                  To receive security and technical information about your products, you can subscribe to various services, such as the Product Alert Tool (accessed from Field Notices), the Cisco Technical Services Newsletter, and Really Simple Syndication (RSS) Feeds.

                  Access to most tools on the Cisco Support website requires a Cisco.com user ID and password.

                  http:/​/​www.cisco.com/​support