DHCPv6 Server Timer Options

The Dynamic Host Configuration Protocol for IPv6 (DHCPv6) server options are part of DHCP stateless autoconfiguration.

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Information About DHCPv6 Server Timer Options

Information Refresh Server Option

The DHCPv6 information refresh option can specify an upper boundary for the length of time a client should wait before refreshing information retrieved from DHCPv6. This option is used with stateless DHCPv6, because there are no addresses or other entities with lifetimes that can tell the client when to contact the DHCPv6 server to refresh its configuration.

NIS- and NIS+-Related Server Options

Users can configure the network information service (NIS) or NIS plus (NIS+) address or domain name of a DHCPv6 server using NIS- and NIS+-related options, and then import that information to the DHCPv6 client.

SNTP Server Option

The SNTP server option provides a list of one or more IPv6 addresses of SNTP servers available to the client for synchronization. The clients use these SNTP servers to synchronize their system time to that of the standard time servers. The server may list the SNTP servers in decreasing order of preference, but clients must treat the list of SNTP servers as an ordered list.

How to Configure DHCPv6 Server Timer Options

Configuring the Information Server Refresh Option

SUMMARY STEPS

    1.    enable

    2.    configure terminal

    3.    ipv6 dhcp pool poolname

    4.    information refresh {days [hours minutes] | infinity}

    5.    end


DETAILED STEPS
     Command or ActionPurpose
    Step 1 enable


    Example:
    Device> enable
     

    Enables privileged EXEC mode.

    • Enter your password if prompted.

     
    Step 2 configure terminal


    Example:
    Device# configure terminal
     

    Enters global configuration mode.

     
    Step 3 ipv6 dhcp pool poolname


    Example:
    Device(config)# ipv6 dhcp pool pool1
     

    Configures a DHCPv6 configuration information pool and enters DHCPv6 pool configuration mode.

     
    Step 4 information refresh {days [hours minutes] | infinity}


    Example:
    Device(config-dhcp)# information refresh 1 1 1
     

    Specifies the information refresh time to be sent to the client.

     
    Step 5 end


    Example:
    Device(config-dhcp)# end
     

    Returns to privileged EXEC mode.

     

    Importing the Information Server Refresh Option

    SUMMARY STEPS

      1.    enable

      2.    configure terminal

      3.    ipv6 dhcp pool poolname

      4.    import information refresh

      5.    end


    DETAILED STEPS
       Command or ActionPurpose
      Step 1 enable


      Example:
      Device> enable
       

      Enables privileged EXEC mode.

      • Enter your password if prompted.

       
      Step 2 configure terminal


      Example:
      Device# configure terminal
       

      Enters global configuration mode.

       
      Step 3 ipv6 dhcp pool poolname


      Example:
      Device(config)# ipv6 dhcp pool pool1
       

      Configures a DHCPv6 configuration information pool and enters DHCPv6 pool configuration mode.

       
      Step 4 import information refresh


      Example:
      Device(config-dhcp)# import information refresh
       

      Imports the information refresh time option to a DHCPv6 client.

       
      Step 5 end


      Example:
      Device(config-dhcp)# end
       

      Returns to privileged EXEC mode.

       

      Configuring NIS- and NISP-Related Server Options

      SUMMARY STEPS

        1.    enable

        2.    configure terminal

        3.    ipv6 dhcp pool poolname

        4.    nis address ipv6-address

        5.    nis domain-name domain-name

        6.    nisp address ipv6-address

        7.    nisp domain-name domain-name

        8.    end


      DETAILED STEPS
         Command or ActionPurpose
        Step 1 enable


        Example:
        Device> enable
         

        Enables privileged EXEC mode.

        • Enter your password if prompted.

         
        Step 2 configure terminal


        Example:
        Device# configure terminal
         

        Enters global configuration mode.

         
        Step 3 ipv6 dhcp pool poolname


        Example:
        Device(config)# ipv6 dhcp pool pool1
         

        Configures a DHCPv6 configuration information pool and enters DHCPv6 pool configuration mode.

         
        Step 4 nis address ipv6-address


        Example:
        Device(config-dhcp)# nis address 2001:DB8:1000:1000::30
         

        Specifies the NIS address of an IPv6 server to be sent to the client.

         
        Step 5 nis domain-name domain-name


        Example:
        Device(config-dhcp)# nis domain-name domain1
         

        Enables a server to convey a client’s NIS domain name information to the client.

         
        Step 6 nisp address ipv6-address


        Example:
        Device(config-dhcp)# nisp address 2001:DB8:3000:3000::42
         

        Specifies the NIS+ address of an IPv6 server to be sent to the DHCPv6 client.

         
        Step 7 nisp domain-name domain-name


        Example:
        Device(config-dhcp)# nisp domain-name domain2
         

        Enables a server to convey a client’s NIS+ domain name information to the DHCPv6 client.

         
        Step 8 end


        Example:
        Device(config-dhcp)# end
         

        Returns to privileged EXEC mode.

         

        Importing NIS- and NIS+-Related Server Options

        SUMMARY STEPS

          1.    enable

          2.    configure terminal

          3.    ipv6 dhcp pool poolname

          4.    import nis address

          5.    import nis domain-name

          6.    import nisp address

          7.    import nisp domain-name

          8.    end


        DETAILED STEPS
           Command or ActionPurpose
          Step 1 enable


          Example:
          Device> enable
           

          Enables privileged EXEC mode.

          • Enter your password if prompted.

           
          Step 2 configure terminal


          Example:
          Device# configure terminal
           

          Enters global configuration mode.

           
          Step 3 ipv6 dhcp pool poolname


          Example:
          Device(config)# ipv6 dhcp pool pool1
           

          Configures a DHCPv6 configuration information pool and enters DHCPv6 pool configuration mode.

           
          Step 4 import nis address


          Example:
          Device(config-dhcp)# import nis address
           

          Imports the NIS servers option to a DHCPv6 client.

           
          Step 5 import nis domain-name


          Example:
          Device(config-dhcp)# import nis domain-name
           

          Imports the NIS domain name option to a DHCPv6 client.

           
          Step 6 import nisp address


          Example:
          Device(config-dhcp)# import nisp address
           

          Imports the NISP address option to a DHCPv6 client.

           
          Step 7 import nisp domain-name


          Example:
          Device(config-dhcp)# import nisp domain-name
           

          Imports the NISP domain name option to a DHCPv6 client.

           
          Step 8 end


          Example:
          Device(config-dhcp)# end
           

          Returns to privileged EXEC mode.

           

          Configuring the SNTP Server Option

          SUMMARY STEPS

            1.    enable

            2.    configure terminal

            3.    ipv6 dhcp pool poolname

            4.    sntp address ipv6-address

            5.    end


          DETAILED STEPS
             Command or ActionPurpose
            Step 1 enable


            Example:
            Device> enable
             

            Enables privileged EXEC mode.

            • Enter your password if prompted.

             
            Step 2 configure terminal


            Example:
            Device# configure terminal
             

            Enters global configuration mode.

             
            Step 3 ipv6 dhcp pool poolname


            Example:
            Device(config)# ipv6 dhcp pool pool1
             

            Configures a DHCPv6 configuration information pool and enters DHCPv6 pool configuration mode.

             
            Step 4 sntp address ipv6-address


            Example:
            Device(config-dhcp)# sntp address 2001:DB8:2000:2000::33
             

            Specifies the SNTP server list to be sent to the client.

             
            Step 5 end


            Example:
            Device(config-dhcp)# end
             

            Returns to privileged EXEC mode.

             

            Importing the SNTP Server Option

            SUMMARY STEPS

              1.    enable

              2.    configure terminal

              3.    ipv6 dhcp pool poolname

              4.    import sntp address ipv6-address

              5.    end


            DETAILED STEPS
               Command or ActionPurpose
              Step 1 enable


              Example:
              Device> enable
               

              Enables privileged EXEC mode.

              • Enter your password if prompted.

               
              Step 2 configure terminal


              Example:
              Device# configure terminal
               

              Enters global configuration mode.

               
              Step 3 ipv6 dhcp pool poolname


              Example:
              Device(config)# ipv6 dhcp pool pool1
               

              Configures a DHCPv6 configuration information pool and enters DHCPv6 pool configuration mode.

               
              Step 4 import sntp address ipv6-address


              Example:
              Device(config-dhcp)# import sntp address 2001:DB8:2000:2000::33
               

              Imports the SNTP server option to a DHCPv6 client.

               
              Step 5 end


              Example:
              Device(config-dhcp)# end
               

              Returns to privileged EXEC mode.

               

              Configuration Examples for DHCPv6 Server Timer Options

              Example: Configuring DHCPv6 Server Timer Options

              Device# show ipv6 dhcp pool

DHCPv6 pool: pool1
  Domain name: domain1
  NIS server domain name: ndomain1
  NIS server domain name: ndomain2
  SNTP server address: 2001:DB8::1
  Imported Information refresh: 90060
  Active clients: 0

              Additional References

              Related Documents

              Related Topic

              Document Title

              IPv6 addressing and connectivity

              IPv6 Configuration Guide

              Cisco IOS commands

              Cisco IOS Master Command List, All Releases

              IPv6 commands

              Cisco IOS IPv6 Command Reference

              Cisco IOS IPv6 features

              Cisco IOS IPv6 Feature Mapping

              Standards and RFCs

              Standard/RFC

              Title

              RFCs for IPv6

              IPv6 RFCs

              MIBs

              MIB

              MIBs Link

              To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL:

              http:/​/​www.cisco.com/​go/​mibs

              Technical Assistance

              Description

              Link

              The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password.

              http:/​/​www.cisco.com/​cisco/​web/​support/​index.html

              Feature Information for DHCPv6 Server Timer Options

              The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.

              Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to . An account on Cisco.com is not required.
              Table 1 Feature Information for DHCPv6 Server Timer Options

              Feature Name

              Releases

              Feature Information

              DHCPv6 Client Information Refresh Option

              12.2(46)SE

              12.4(15)T

              The DHCPv6 information refresh option can specify an upper boundary for the length of time a client should wait before refreshing information retrieved from DHCPv6.

              The following commands were introduced or modified: import information refresh, information refresh, ipv6 dhcp pool, show ipv6 dhcp pool.

              DHCPv6 Server Timer Options

              12.2(46)SE

              12.4(15)T

              The DHCPv6 server options are part of DHCP stateless autoconfiguration.

              The following commands were introduced or modified: import nis-address, import nis domain-name, import nisp address, import nisp domain-name, ipv6 dhcp pool, nis address, nis domain-name, nisp address, nisp domain-name, show ipv6 dhcp pool.