ipv6 nd valid-life (for a port)
   
   
      Modify an existing neighbor discovery prefix. Configure the valid lifetime in seconds that
         indicates the length of time this prefix is advertised.
    
      
      Command Parameters
         
         
            
               - valid-life <0-4294967295>
- Configures the valid lifetime in
                  seconds that indicates the length of time this prefix is advertised. The default
                  is 2592000. 
- A valid lifetime is the length of
                  time of the preferred and depreciated state of an auto configuration address.
- WORD<0-255>
- Specifies the IPv6 address and
                  prefix.
Default
         
         The default is 2592000.
      
      Command Mode
         
         GigabitEthernet Interface Configuration