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This chapter describes the Cisco NX-OS Ethernet and virtual Ethernet commands that begin with F.
To enable Flex Links, use the feature flexlink command. To disable Flex Links, use the no form of this command.
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This example shows how to enable Flex Links on the switch:
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Displays the status of features enabled or disabled on the switch. |
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Configures Flex Links, which are two interfaces that provide backup to each other, on a Layer 2 interface. |
To enable the creation of VLAN interfaces, use the feature interface-vlan command. To disable the VLAN interface feature, use the no form of this command.
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You must use the feature interface-vlan command before you can create VLAN interfaces.
This example shows how to enable the interface VLAN feature on the switch:
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Displays the features that are enabled or disabled on the switch. |
To enable the Link Aggregation Control Protocol (LACP), which bundles a number of physical ports together to form a single logical channel, use the feature lacp command. To disable LACP on the switch, use the no form of this command.
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You must remove all the LACP configuration parameters from all EtherChannels on the switch before you can disable LACP.
Even after you enable LACP globally, you do not have to run LACP on all EtherChannels on the switch. You enable LACP on each channel mode using the channel-group mode command.
This example shows how to enable LACP EtherChannels on the switch:
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The Link Layer Discovery Protocol (LLDP), which is a neighbor discovery protocol that is used for network devices to advertise information about themselves to other devices on the network, is enabled on the switch by default.
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You cannot enable or disable LLDP on a Cisco Nexus device. LLDP is enabled on the switch by default. However, the feature lldp command shows as part of the running configuration on the switch, as shown below:
The Cisco Discovery Protocol (CDP) is a device discovery protocol that runs over Layer 2 (the data link layer) on all Cisco-manufactured devices (routers, bridges, access servers, and switches). CDP allows network management applications to automatically discover and learn about other Cisco devices connected to the network.
To support non-Cisco devices and to allow for interoperability between other devices, the switch supports the Link Layer Discovery Protocol (LLDP). LLDP is a neighbor discovery protocol that is used for network devices to advertise information about themselves to other devices on the network. This protocol runs over the data-link layer, which allows two systems running different network layer protocols to learn about each other.
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To enable port security on Layer 2 interfaces, use the feature port-security command. To disable port security, use the no form of this command.
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Use the port security feature to secure a port by limiting and identifying the MAC addresses of the switches that are allowed to access the port.
You can enable port security on a virtual port channel (vPC) port only if the following occurs:
This example shows how to enable port security on the switch:
This example shows how to disable port security on the switch:
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Displays the features that are enabled or disabled on the switch. |
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Configures the switchport parameters to establish port security. |
To enable private VLANs, use the feature private-vlan command. To return to the default settings, use the no form of this command.
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The private VLAN commands are not available until you enable the private VLAN feature.
You cannot disable the private VLANs if there are operational ports on the switch that are in private VLAN mode.
Note A private VLAN-isolated port on a Cisco Nexus device running the current release of Cisco NX-OS does not support IEEE 802.1Q encapsulation and cannot be used as a trunk port.
This example shows how to enable private VLAN functionality on the switch:
switch(config)#
feature private-vlan
To enable the Cisco-proprietary Unidirectional Link Detection (UDLD) protocol, which allows ports that are connected through fiber optics or copper Ethernet cables to monitor the physical configuration of the cables and detect when a unidirectional link exists, use the feature udld command. To disable UDLD on the switch, use the no form of this command.
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This example shows how to enable UDLD on the switch:
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To enable the Cisco Virtual Machine Fabric Extender (VM-FEX), use the feature vmfex command. To disable VM-FEX, use the no form of this command.
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Before you use this command, make sure that you install and enable the virtualization feature set using the install feature-set virtualization and feature-set virtualization commands respectively.
If you attempt to disable the VM-FEX feature with virtual Ethernet interface or port profile configurations enabled, the switch returns an error message.
This example shows how to enable VM-FEX on the switch:
This example shows how to disable VM-FEX on the switch:
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Displays the features that are enabled or disabled on the switch. |
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Configures the interface as a nontrunking nontagged single-VLAN Ethernet interface. |
To enable VLAN Trunking Protocol (VTP), use the feature vtp command. To disable VTP, use the no form of this command.
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This example shows how to enable VTP on the switch:
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To enable the Cisco Virtual Machine features on the switch, use the feature-set virtualization command. To disable the virtualization feature, use the no form of this command.
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Note The Cisco virtual machine feature is supported only on the Cisco Nexus devices.
Before you use this command, make sure that you install the virtualization feature set on the switch by using the install feature-set virtualization command.
You cannot view or access any virtualization commands until you enable a Cisco virtual machine on the switch.
Note You must install the Cisco virtual machine feature set before you enable virtualization on the switch.
Before you disable this feature on the switch, do the following:
This example shows how to enable the virtualization feature on the switch:
This example shows how to disable the virtualization feature on the switch:
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Enables or disables Cisco Virtual Machine Fabric Extender (VM-FEX) on the switch. |
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