N Commands

This chapter describes the Cisco NX-OS Fibre Channel, virtual Fibre Channel, and Fibre Channel over Ethernet (FCoE) commands that begin with N.

npv auto-load-balance disruptive

To enable N Port Virtualization (NPV) disruptive load balancing, use the npv auto-load-balance disruptive command. To disable this feature, use the no form of this command.

npv auto-load-balance disruptive

no npv auto-load-balance disruptive

Syntax Description

This command has no arguments or keywords.

Command Default

None

Command Modes

Global configuration mode

Command History

Release
Modification

4.0(0)N1(2a)

This command was introduced.


Usage Guidelines

Disruptive load balancing can be configured only in NPV mode.

When disruptive load balancing is enabled, NPV redistributes the server interfaces across all available NP uplinks when a new NP uplink becomes operational. To move a server interface from one NP uplink to another NP uplink, NPV forces reinitialization of the server interface so that the server performs a new login to the core switch. This action causes traffic disruption on the attached end devices.

To avoid disruption of server traffic, enable this feature only after adding a new NP uplink, and then disable it again after the server interfaces have been redistributed.

Examples

This example shows how to enable disruptive load balancing: 

switch(config)# npv auto-load-balance disruptive 

 
   
 
    
   
 Related Commands
 
   
 
    
 
      
      
      
 
        
        

          Command 
        
 		 
        
        

          Description 
        
 		 
      
 
      
 
       
 feature npv 
 		 
       
 Enables NPV mode. 
 		 
      
 
      
 
       
 show npv status 
 		 
       
 Displays the NPV current status. 
 		 
      
 
      
    
 
   
 
   
 
   
 
 
    
     
    
    
   
 npv traffic-map 
 
    
   
 To configure an N Port Virtualization (NPV) traffic map, use the npv traffic-map command. To disable this feature, use the no form of this command. 
 
    
   
npv traffic-map server-interface {fc slot/port | vfc vfc-id} external-interface fc slot/port 
 
    
   
no npv traffic-map server-interface {fc slot/port | vfc vfc-id} external-interface fc slot/port 
 
    
   
 Syntax Description
 
   
 
    
 
      
      
      
 
       
 server-interface 
 		 
       
 Specifies the server interface or a range of server interfaces. 
 		 
      
 
      
 
       
 fc slot/port 
 		 
       
 Specifies the slot number and port number for a native Fibre Channel interface. 
 		 
      
 
      
 
       
 vfc vfc-id 
 		 
       
 Specifies a virtual Fibre Channel interface. 
 		 
      
 
      
 
       
 external-interface 
 		 
       
 Specifies the NP/TNP uplink interface or a range of NP/TNP uplink interfaces that can be selected by the server interface. 
 		 
      
 
      
    
 
   
 
   
 
   
 
 
    
   
 Command Default 
 
    
   
 No traffic map. The switch uses automatic uplink selection to select an NP uplink for the server interface. 
 
    
   
 Command Modes 
 
    
   
 Global configuration mode 
 
    
   
 Command History
 
   
 
    
 
      
      
      
 
        
        

          Release 
        
 		 
        
        

          Modification 
        
 		 
      
 
      
 
       
 4.0(0)N1(2a) 
 		 
       
 This command was introduced. 
 		 
      
 
      
    
 
   
 
   
 
   
 
 
    
   
 Usage Guidelines 
 
    
   
 This command is only available when the switch is operating in NPV mode. 
 
    
   
 NPV traffic maps can be configured only in NPV mode. 
 
    
   
 Examples 
 
    
   
 This example shows how to create a mapping between server interface vfc1 and NP uplink fc 3/1: 
 
    
   
 
    
switch(config)# npv traffic-map server-interface vfc 1 external-interface fc 3/1 

 
   
 
    
   
 
    
 
   
 
    
   
 Related Commands
 
   
 
    
 
      
      
      
 
        
        

          Command 
        
 		 
        
        

          Description 
        
 		 
      
 
      
 
       
 feature npv 
 		 
       
 Enables NPV mode. 
 		 
      
 
      
 
       
 show npv status 
 		 
       
 Displays the NPV current status.