Cisco Nexus 1000V for KVM Interface Configuration Guide, Release 5.x

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Cisco Nexus 1000V for KVM Interface Configuration Guide, Release 5.x

Chapter Title

Configuring Interface Parameters

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Updated:
November 19, 2014

Chapter: Configuring Interface Parameters

Configuring Interface Parameters

This chapter contains the following sections:

Information About the Basic Interface Parameters

Description

For the vEthernet, and management interfaces, you can configure the description parameter to provide a name for the interface. Using a unique name for each interface allows you to quickly identify the interface when you are looking at a listing of multiple interfaces.

By default, the description for vEthernet interfaces is automatically formatted to contain information about the connected device. The description for a virtual Network Interface Card (vNIC), for example, contains the VM name and network adapter number. You keep this default description or you can override it with a description of your choosing.

Administrative Status

The administrative-status parameter determines whether an interface is up or down. When an interface is administratively down, it is disabled and unable to transmit data. When an interface is administratively up, it is enabled and able to transmit data.

Guidelines and Limitations

Interface parameters have the following guidelines and limitations:

  • To specify an interface in the CLI, use the following guideline:

    • For a vEthernet port, use vethernet number, where number is a number from 1 to 256.

Specifying an Interface to Configure

You can use this procedure to specify an interface to configure.

Before You Begin

You are logged in to the CLI in EXEC mode.

Procedure
     Command or ActionPurpose
    Step 1switch# configure terminal  

    Enters global configuration mode.

     
    Step 2switch(config)# interface interface 

    Enters interface configuration mode for the specified interface.

     
    Step 3switch( config-if)# show interface interface  (Optional)

    Displays the current configuration of interfaces.

    The interface argument is defined as follows:

    • For the management interface, use mgmt 0 or mgmt0.

    • For a vEthernet port, use vethernet number, where number is a number from 1 to 1048575.

      
    switch# configure terminal
switch(config)# interface vethernet 5
switch(config-if)# show interface vethernet 5
switch(config-if)#

    Configuring a Description

    You can use this procedure to add a description to an interface.

    Before You Begin

    • You are logged in to the CLI in EXEC mode.

    • A description is case-sensitive and can be up to 80 alphanumeric characters in length.
    Procedure
       Command or ActionPurpose
      Step 1switch# configure terminal  

      Enters global configuration mode.

       
      Step 2 switch(config)# interface interface 

      Enters interface configuration mode for the specified interface.

       
      Step 3 switch(config-if)# description string 

      Adds a description of up to 80 alphanumeric characters for the interface and saves it in the running configuration.

       
      Step 4 switch(config-if)# show interface interface  (Optional)

      Displays the interface status, which includes the description.

       
      Step 5switch(config-if)# copy running-config startup-config   (Optional)

      Saves the change persistently through reboots and restarts by copying the running configuration to the startup configuration.

       

      The following example shows how to set the interface description:

      switch# configure terminal 
switch(config)# interface vethernet 5
switch(config-if)# description vEthernet on module 5
switch(config-if)#

      Shutting Down and Activating an Interface

      You can use this procedure to shut down and restart interfaces.

      Before You Begin

      • You are logged in to the CLI in EXEC mode.

      • When you shut down an interface, it becomes disabled and the output of monitoring commands show it as being down.

      • To activate an interface that has been shut down, you must restart the device.

      Procedure
         Command or ActionPurpose
        Step 1switch# configure terminal  

        Enters global configuration mode.

         
        Step 2switch(config)# interface interface 

        Specifies an interface to configure, and enters interface configuration mode.

         
        Step 3switch(config-if)# shutdown  

        Disables the interface in the running configuration .

         
        Step 4switch( config-if)# show interface interface  (Optional)

        Displays the interface status, which includes the administrative status.

         
        Step 5switch(config-if)# no shutdown  

        Reenables the interface in the running configuration .

         
        Step 6switch( config-if)# show interface interface  (Optional)

        Displays the interface status, which includes the administrative status.

        • For the management interface, use mgmt 0 or mgmt0.

         
        Step 7switch(config-if)# copy running-config startup-config   (Optional)

        Saves the change persistently through reboots and restarts by copying the running configuration to the startup configuration.

         

        The following example shows how to shut down vethernet interafce:

        switch# configure terminal
switch(config)# interface vethernet 5
switch(config-if)# shutdown
switch(config-if)# no shutdown
switch(config-if)#

        Clearing the Interface Counters

        You can use this procedure to clear the interface counters.

        Before You Begin

        Log in to the CLI in EXEC mode, configuration mode, or interface configuration mode.

        Procedure
           Command or ActionPurpose
          Step 1 switch# clear counters interface interface  

          • vethernet number—Virtual ethernet interface. The range is from 1 to 1048575.

          • vethernet number—Virtual ethernet interface. The range is from 1 to 1048575.

          • vethernet number—Virtual ethernet interface. The range is from 1 to 1048575.

          • mgmt 0—Management interface.

          • vethernet number—Virtual ethernet interface. The range is from 1 to 1048575.

          • vethernet number—Virtual ethernet interface. The range is from 1 to 1048575.

          Clears the counters for the specified interface:

           
          Step 2 switch# show interface interface   (Optional)

          Displays the interface status, which includes the counters, for the specified interface:

          • control 0—Control interface.

          • ethernet number—Ethernet IEEE 802.3z. The range is from 1 to 514.

          • mgmt 0—Management interface.

          • port-channel number—Port Channel interface. The range is from 1 to 4096.

          • vethernet number—Virtual ethernet interface. The range is from 1 to 1048575.

           

          The following example shows how to clear and reset the counters on vethernet 5: 

          switch# clear counters interface vethernet 5
switch#

          Verifying the Basic Interface Parameters

          Use one of the following commands to verify the configuration:

          Command Purpose

          show interface interface

          Displays the configured states of one or all interfaces.

          show interface brief

          Displays a table of interface states.

          show interface switchport

          Displays the status of Layer 2 ports.

          Feature History for Basic Interface Parameters

          Feature Name

          Releases

          Feature Information

          Basic interface parameters

          Release 5.2(1)IC1(1.1)

          This feature was introduced.

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