Table Of Contents

F Commands

fcoe

feature fex

fex

fex associate

fex pinning redistribute

fex queue-limit

F Commands

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This chapter describes the Cisco NX-OS commands that begin with F that are used to manage a Cisco Nexus 2000 Series Fabric Extender from a Cisco Nexus 5500 switch.

fcoe

To associate a Cisco Nexus 2000 Series Fabric Extender (FEX) to a switch for pinning Fibre Channel over Ethernet (FCoE) Initialization Protocol (FIP) and FCoE traffic, use the fcoe command. To remove the association, use the no form of this command.

fcoe [vsan vsan-id]

no fcoe [vsan]

Syntax Description

vsan vsan-id

Specifies the VSAN status. The VSAN ID range is from 1 to 4094.

Command Default

None

Command Modes

FEX configuration mode
VLAN configuration mode

Command History

Release	Modification
5.1(3)N1(1)	This command was introduced.

Usage Guidelines

Before you use this command, make sure that you enable the Fabric Extender (FEX) features on the switch by using the feature fex command.

You can use this command only on a Cisco Nexus 2232P Fabric Extender. When you bind an interface to a virtual Fibre Channel interface to enable FCoE traffic, you must use slot number 1. The port number can be from 1 to 32.

Examples

This example shows how to configure a FEX as FCoE enabled:

switch# configure terminal

switch(config)# feature fex

switch(config)# fex 100

switch(config-fex)# fcoe

switch(config-fex)#

This example shows how to configure a pair of FEXs to carry FCoE traffic in a fabric virtual port channel (vPC) topology, with the host uplink ports in the FEXs configured to the same port channel:

switch# configure terminal

switch(config)# feature lacp

switch(config)# feature fex

switch(config)# feature fcoe

switch(config)# fex 100

switch(config-fex)# fcoe

switch(config-fex)# exit

switch(config)# interface vfc 1

switch(config-if)# bind interface eth101/1/1

switch(config)# interface eth101/1/1

switch(config-if)# channel-group 1

switch(config)# fex 102

switch(config-fex)# fcoe

switch(config)# interface vfc 1

switch(config-if)# bind interface eth102/1/1

switch(config)# interface eth102/1/1

switch(config-if)# channel-group 1

switch(config-if)#

This example shows how to configure FCoE traffic on a VLAN:

switch# configure terminal

switch(config)# vlan 5

switch(config-vlan)# fcoe vsan 1

switch(config-vlan)#

This example shows how to disable FCoE traffic on a FEX:

switch# configure terminal

switch(config)# fex 100

switch(config-fex)# no fcoe

switch(config-fex)#

Related Commands

Command	Description
feature fcoe	Enables the FCoE feature on the switch.
feature fex	Enables the FEX feature on the switch.
feature lacp	Enables the Link Aggregation Control Protocol (LACP).
show fex	Displays information about a specific FEX.

feature fex

To enable Fabric Extender (FEX) features on the switch, use the feature fex command. To disable FEX, use the no form of this command.

feature fex

no feature fex

Syntax Description

This command has no arguments or keywords.

Command Default

None

Command Modes

Global configuration mode

Command History

Release	Modification
5.0(2)N1(1)	This command was introduced.

Examples

This example shows how to enable FEX features on the switch:

switch(config)# feature fex 

switch(config)#

Related Commands

Command	Description
fex	Creates a Fabric Extender and enters fabric extender configuration mode.
show feature	Displays the features enabled or disabled on the switch.

fex

To create a Fabric Extender and enter fabric extender configuration mode, use the fex command. To delete the Fabric Extender configuration, use the no form of this command.

fex chassis_ID

no fex chassis_ID

Syntax Description

chassis_ID

Fabric Extender chassis ID. The chassis ID range is from 100 to 199.

Command Default

None

Command Modes

Global configuration mode

Command History

Release	Modification
5.0(2)N1(1)	This command was introduced.

Usage Guidelines

You can create and configure the Fabric Extender before you connect and associate it to an interface on the parent switch. Once you associate the Fabric Extender to the switch, the configuration you created is transferred over to the Fabric Extender and applied.

Examples

This example shows how to enter Fabric Extender configuration mode:

switch# configure terminal

switch(config)# fex 101 

switch(config-fex)#

This example shows how to delete the Fabric Extender configuration:

switch(config-fex)# no fex 101

switch(config)#

Related Commands

Command	Description
beacon	Turns on the locator beacon LED of a Fabric Extender.
description (fex)	Specifies a description for a Fabric Extender.
fex associate	Associates a Fabric Extender to an Ethernet or EtherChannel interface.
pinning max-links	Specifies the number of statically pinned uplinks connected to a Fabric Extender.
serial	Assigns a serial number to a Fabric Extender.
show fex	Displays all configured Fabric Extender chassis connected to the switch.
type	Specifies the Fabric Extender card.

fex associate

To associate a Fabric Extender to a fabric interface, use the fex associate command. To disassociate the Fabric Extender, use the no form of this command.

fex associate chassis_ID

no fex associate [chassis_ID]

Syntax Description

chassis_ID

Fabric Extender chassis ID. The chassis ID range is from 100 to 199.

Command Default

None

Command Modes

Interface configuration mode

Command History

Release	Modification
5.0(2)N1(1)	This command was introduced.

Usage Guidelines

Before you can associate an interface on the parent switch to the Fabric Extender, you must first make the interface into a fabric interface by entering the switchport mode fex-fabric command.

Examples

This example shows how to associate the Fabric Extender to an Ethernet interface:

switch# configure terminal 

switch(config)# interface ethernet 1/40 

switch(config-if)# switchport mode fex-fabric 

switch(config-if)# fex associate 101 

This example shows how to associate the Fabric Extender to an EtherChannel interface:

switch# configure terminal 

switch(config)# interface port-channel 4 

switch(config-if)# switchport mode fex-fabric 

switch(config-if)# fex associate 101 

Related Commands

Command	Description
show fex	Displays all configured Fabric Extender chassis connected to the switch.
switchport mode fex-fabric	Sets the interface to be an uplink port.

fex pinning redistribute

To redistribute the host interfaces on a Fabric Extender, use the fex pinning redistribute command.

fex pinning redistribute chassis_ID

Syntax Description

chassis_ID

Fabric Extender chassis ID. The chassis ID range is from 100 to 199.

Command Default

None

Command Modes

EXEC mode

Command History

Release	Modification
5.0(2)N1(1)	This command was introduced.

Usage Guidelines

When you provision the Fabric Extender using the statically pinned mode (see the Cisco Nexus 2000 Series Fabric Extender Software Configuration Guide), the host interfaces on the Fabric Extender are pinned to the fabric interfaces in the order that they were initially configured. The next time that you reboot the Fabric Extender, the configured fabric interfaces are pinned to the host interfaces in an ascending order by the port number of the fabric interface.

Use the fex pinning redistribute command if you want to configure the same fixed distribution of host interfaces without restarting the Fabric Extender after your initial configuration.

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Caution This command disrupts all the host interface ports of the Fabric Extender. However, the disruption is shorter than would be the case if you reboot the Fabric Extender.

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Examples

This example shows how to redistribute the host interfaces on a Fabric Extender:

switch# fex pinning redistribute 101 

switch# 

Related Commands

Command	Description
pinning max-links	Defines the number of uplinks on a Fabric Extender.
show fex	Displays all configured Fabric Extender chassis connected to the switch.
show interface fex-intf	Displays the Fabric Extender ports pinned to a specific switch interface.

fex queue-limit

To limit the amount of input buffer space (in bytes) allocated to each Fabric Extender port, use the fex queue-limit command. To disable the drop threshold and allow a Fabric Extender port to use all available buffer space, use the no form of this command.

fex queue-limit

no fex queue-limit

Syntax Description

This command has no arguments or keywords.

Command Default

Fabric Extender queue limit is available in the default configuration and is set on.

Command Modes

System QoS configuration mode

Command History

Release	Modification
5.0(2)N1(1)	This command was introduced.

Usage Guidelines

By default, the drop threshold applies to each Fabric Extender port to limit the amount of buffer being allocated for each port. To restore the default queue limit of each Fabric Extender port, use the fex queue-limit command.

Examples

This example shows how to set the queue limit for the input buffer for each Fabric Extender port:

switch(config)# system qos 

switch(config-sys-qos)# fex queue-limit 

switch(config-sys-qos)#

This example shows how to restore the default queue limit for each Fabric Extender port:

switch(config)# system qos 

switch(config-sys-qos)# no fex queue-limit 

switch(config-sys-qos)#

Related Commands

Command	Description
show fex	Displays all configured Fabric Extender chassis connected to the switch.