IPv6 Configuration Guide, Cisco IOS XE Release 3SE (Cisco WLC 5700 Series)
Configuring IPv6 Client IP Address Learning
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Configuring IPv6 Client IP Address Learning

Contents

Configuring IPv6 Client IP Address Learning

Prerequisites for IPv6 Client Address Learning

Before configuring IPv6 client address learning, configure the wireless clients to support IPv6.

Information About IPv6 Client Address Learning

Client Address Learning is configured on controller to learn the wireless client's IPv4 and IPv6 address and clients transition state maintained by the controller on an association, re-association, de-authentication and timeout.

There are three ways for IPv6 client to acquire IPv6 addresses:

  • Stateless Address Auto-Configuration (SLACC)
  • Stateful DHCPv6
  • Static Configuration

For all of these methods, the IPv6 client always sends neighbor solicitation DAD (Duplicate Address Detection) request to ensure there is no duplicate IP address on the network. The controller snoops the client's NDP and DHCPv6 packets to learn about its client IP addresses.

SLAAC Address Assignment

The most common method for IPv6 client address assignment is Stateless Address Auto-Configuration (SLAAC). SLAAC provides simple plug-and-play connectivity where clients self-assign an address based on the IPv6 prefix. This process is achieved

Stateless Address Auto-Configuration (SLAAC) is configured as follows:

  • Host sends a router solicitation message.
  • Hosts waits for a Router Advertisement message.
  • Hosts take the first 64 bits of the IPv6 prefix from the Router Advertisement message and combines it with the 64 bit EUI-64 address (in the case of ethernet, this is created from the MAC Address) to create a global unicast message. The host also uses the source IP address, in the IP header, of the Router Advertisement message, as its default gateway.
  • Duplicate Address Detection is performed by IPv6 clients in order to ensure that random addresses that are picked do not collide with other clients.
  • The choice of algorithm is up to the client and is often configurable.

The last 64 bits of the IP v6 address can be learned based on the following 2 algorithms:

  • EUI-64 which is based on the MAC address of the interface, or
  • Private addresses that are randomly generated.
Figure 1. SLAAC Address Assignment



The following Cisco IOS configuration commands from a Cisco-capable IPv6 router are used to enable SLAAC addressing and router advertisements:

ipv6 unicast-routing
interface Vlan20
description IPv6-SLAAC
ip address 192.168.20.1 255.255.255.0
ipv6 address FE80:DB8:0:20::1 linklocal
ipv6 address 2001:DB8:0:20::1/64
ipv6 enable
end

Stateful DHCPv6 Address Assignment

Figure 2. Stateful DHCPv6 Address Assignment

The use of DHCPv6 is not required for IPv6 client connectivity if SLAAC is already deployed. There are two modes of operation for DHCPv6 called Stateless and Stateful.

The DHCPv6 Stateless mode is used to provide clients with additional network information that is not available in the router advertisement, but not an IPv6 address as this is already provided by SLAAC. This information can include the DNS domain name, DNS server(s), and other DHCP vendor-specific options. This interface configuration is for a Cisco IOS IPv6 router implementing stateless DHCPv6 with SLAAC enabled:

ipv6 unicast-routing
ipv6 dhcp pool IPV6_DHCPPOOL
address prefix 2001:db8:5:10::/64
domain-name cisco.com
dns-server 2001:db8:6:6::1
interface Vlan20
description IPv6-DHCP-Stateless
ip address 192.168.20.1 255.255.255.0
ipv6 nd other-config-flag
ipv6 dhcp server IPV6_DHCPPOOL
ipv6 address 2001:DB8:0:20::1/64
end

The DHCPv6 Stateful option, also known as managed mode, operates similarly to DHCPv4 in that it assigns unique addresses to each client instead of the client generating the last 64 bits of the address as in SLAAC. This interface configuration is for a Cisco IOS IPv6 router implementing stateful DHCPv6 on a local Controller:

ipv6 unicast-routing
ipv6 dhcp pool IPV6_DHCPPOOL
address prefix 2001:db8:5:10::/64
domain-name cisco.com
dns-server 2001:db8:6:6::1
interface Vlan20
description IPv6-DHCP-Stateful
ip address 192.168.20.1 255.255.255.0
ipv6 address 2001:DB8:0:20::1/64
ipv6 nd prefix 2001:DB8:0:20::/64 no-advertise
ipv6 nd managed-config-flag
ipv6 nd other-config-flag
ipv6 dhcp server IPV6_DHCPPOOL
end

This interface configuration is for a Cisco IOS IPv6 router implementing stateful DHCPv6 on an external DHCP server:

ipv6 unicast-routing
domain-name cisco.com
dns-server 2001:db8:6:6::1
interface Vlan20
description IPv6-DHCP-Stateful
ip address 192.168.20.1 255.255.255.0
ipv6 address 2001:DB8:0:20::1/64
ipv6 nd prefix 2001:DB8:0:20::/64 no-advertise
ipv6 nd managed-config-flag
ipv6 nd other-config-flag
ipv6 dhcp_relay destination 2001:DB8:0:20::2
end

Static IP Address Assignment

Statically configured address on a client.

Router Solicitation

A Router Solicitation message is issued by a host controller to facilitate local routers to transmit Router Advertisement from which it can obtain information about local routing or perform Stateless Auto-configuration. Router Advertisements are transmitted periodically and the host prompts with an immediate Router Advertisement using a Router Solicitation such as - when it boots or following a restart operation.

Router Advertisement

A Router Advertisement message is issued periodically by a router or in response to a Router Solicitation message from a host. The information contained in these messages is used by hosts to perform Stateless Auto-configuration and to modify its routing table.

Neighbor Discovery

IPv6 Neighbor Discovery is a set of messages and processes that determine relationships between neighboring nodes. Neighbor Discovery replaces ARP, ICMP Router Discovery, and ICMP Redirect used in IPv4.

IPv6 Neighbor Discovery inspection analyzes neighbor discovery messages in order to build a trusted binding table database, and IPv6 neighbor discovery packets that do not comply are dropped. The neighbor binding table in the controller tracks each IPv6 address and its associated MAC address. Clients are expired from the table according to Neighbor Binding timers.

Neighbor Discovery Suppression

The IPv6 addresses of wireless clients are cached by the controller. When the controller receives an NS multicast looking for an IPv6 address, and if the target address is known to the controller and belongs to one of its clients, the controller will reply with an NA message on behalf of the client. The result of this process generates the equivalent of the Address Resolution Protocol (ARP) table of IPv4 but is more efficient - uses generally fewer messages.


Note


The controller acts like proxy and respond with NA, only when the ipv6 nd suppress command is configured

If the controller does not have the IPv6 address of a wireless client, the controller will not respond with NA and forward the NS packet to the wireless side. To resolve this, an NS Multicast Forwarding knob is provided. If this knob is enabled, the controller gets the NS packet for the IPv6 address that it does not have (cache miss) and forwards it to the wireless side. This packet reaches the intended wireless client and the client replies with NA.

This cache miss scenario occurs rarely, and only very few clients which do not implement complete IPv6 stack may not advertise their IPv6 address during NDP.

RA Guard

IPv6 clients configure IPv6 addresses and populate their router tables based on IPv6 router advertisement (RA) packets. The RA guard feature is similar to the RA guard feature of wired networks. RA guard increases the security of the IPv6 network by dropping the unwanted or rogue RA packets that come from wireless clients. If this feature is not configured, malicious IPv6 wireless clients announce themselves as the router for the network often with high priority, which would take higher precedence over legitimate IPv6 routers.

RA-Guard also examines the incoming RA's and decides whether to switch or block them based solely on information found in the message or in the switch configuration. The information available in the frames received is useful for RA validation:
  • Port on which the frame is received
  • IPv6 source address
  • Prefix list

The following configuration information created on the switch is available to RA-Guard to validate against the information found in the received RA frame:

  • Trusted/Untrusted ports for receiving RA-guard messages
  • Trusted/Untrusted IPv6 source addresses of RA-sender
  • Trusted/Untrusted Prefix list and Prefix ranges
  • Router Preference

RA guard occurs at the controller. You can configure the controller to drop RA messages at the controller. All IPv6 RA messages are dropped, which protects other wireless clients and upstream wired network from malicious IPv6 clients.

//Create a policy for RA Guard//
ipv6 nd raguard policy raguard-router
trusted-port
device-role router
//Applying the RA Guard Policy on port/interface//
interface tengigabitethernet1/0/1 (Katana)
interface gigabitethernet1/0/1 (Edison)

ipv6 nd raguard attach-policy raguard-router

RA Throttling

RA throttling allows the controller to enforce limits to RA packets headed toward the wireless network. By enabling RA throttling, routers that send many RA packets can be trimmed to a minimum frequency that will still maintain an IPv6 client connectivity. If a client sends an RS packet, an RA is sent back to the client. This RA is allowed through the controller and unicasted to the client. This process ensures that the new clients or roaming clients are not affected by the RA throttling.

Configuring RA Guard Policy (CLI)

Configure RA Guard policy on the controller to add IPv6 client addresses and populate the router table based on IPv6 router advertisement packets.

Before You Begin
SUMMARY STEPS

    1.    configure terminal

    2.    ipv6 nd raguard policy raguard-router

    3.    trustedport

    4.    device-role router

    5.    exit


DETAILED STEPS
      Command or Action Purpose
    Step 1 configure terminal


    Example:
    
                
                
    Controller# configure terminal
    
    
     

    Enters the global configuration mode.

     
    Step 2 ipv6 nd raguard policy raguard-router


    Example:
    Controller(config)# ipv6 nd raguard policy raguard-router
     
    Defines the RA guard policy name and enters RA guard policy configuration mode.  
    Step 3 trustedport


    Example:
    Controller(config-ra-guard)# trustedport
     
    (Optional) Specifies that this policy is being applied to trusted ports.  
    Step 4 device-role router


    Example:
    Controller(config-ra-guard)# device-role router
     
    Specifies the role of the device attached to the port.  
    Step 5 exit


    Example:
    Controller(config-ra-guard)# exit
     
    Exits RA guard policy configuration mode and returns to global configuration mode.  

    Applying RA Guard Policy (CLI)

    Applying the RA Guard policy on the controller will block all the untrusted RA's.

    Before You Begin
    SUMMARY STEPS

      1.    configure terminal

      2.    interface tengigabitethernet 1/0/1

      3.    ipv6 nd raguard attach-policy raguard-router

      4.    exit


    DETAILED STEPS
        Command or Action Purpose
      Step 1 configure terminal


      Example:
      
                  
                  
      Controller# configure terminal
      
      
       

      Enters the global configuration mode.

       
      Step 2 interface tengigabitethernet 1/0/1


      Example:
      Controller (config)# interface tengigabitethernet 1/0/1
       
      Specifies an interface type and number, and places the device in interface configuration mode.  
      Step 3 ipv6 nd raguard attach-policy raguard-router


      Example:
      Controller(config-if)# ipv6 nd raguard attach-policy raguard-router
       
      Applies the IPv6 RA Guard feature to a specified interface.  
      Step 4 exit


      Example:
      Controller(config-if)# exit
       
      Exits interface configuration mode.  

      Configuring RA Throttle Policy (CLI)

      Configure RA Throttle policy to allow the enforce the limits

      Before You Begin
      SUMMARY STEPS

        1.    configure terminal

        2.    ipv6 nd ra-throttler policy ra-throttler1

        3.    throttleperiod500

        4.    max-through10

        5.    allow-atleast 5 at-most 10


      DETAILED STEPS
          Command or Action Purpose
        Step 1 configure terminal


        Example:
        
                    
                    
        Controller# configure terminal
        
        
         

        Enters the global configuration mode.

         
        Step 2 ipv6 nd ra-throttler policy ra-throttler1


        Example:
        Controller(config)# ipv6 nd ra-throttler policy ra-throttler1
         
        Define the router advertisement (RA) throttler policy name and enter IPv6 RA throttle policy configuration mode.  
        Step 3 throttleperiod500


        Example:
        Controller(config-nd-ra-throttle)# throttleperiod 500
         
        Configures the throttle period in an IPv6 RA throttler policy.  
        Step 4 max-through10


        Example:
        Controller(config-nd-ra-throttle)# max-through 500
         
        Limits multicast RAs per VLAN per throttle period.  
        Step 5 allow-atleast 5 at-most 10


        Example:
        Controller(config-nd-ra-throttle)# allow-atleast 5 at-most 10
         
        Limits the number of multicast RAs per device per throttle period in an RA throttler policy.  

        Applying RA Throttle Policy on VLAN (CLI)

        Applying the RA Throttle policy on a VLAN. By enabling RA throttling, routers that send many RA packets can be trimmed to a minimum frequency that will still maintain an IPv6 client connectivity.

        Before You Begin
        SUMMARY STEPS

          1.    configure terminal

          2.    vlan configuration 1

          3.    ipv6 nd ra throttler attach-policy ra-throttler1


        DETAILED STEPS
            Command or Action Purpose
          Step 1 configure terminal


          Example:
          
                      
                      
          Controller# configure terminal
          
          
           

          Enters the global configuration mode.

           
          Step 2 vlan configuration 1


          Example:
          Controller(config)# vlan configuration 1
           
          Configures a VLAN or a collection of VLANs and enters VLAN configuration mode.  
          Step 3 ipv6 nd ra throttler attach-policy ra-throttler1


          Example:
          Controller(config-vlan)# ipv6 nd ra throttler attach-policy ra-throttler1
           
          Attaches an IPv6 RA throttler policy to a VLAN or a collection of VLANs.  
          Related Concepts

          Configuring IPv6 Snooping (CLI)

          IPv6 snooping must always be enabled on the switch and the controller.

          Before You Begin

          Enable IPv6 on the client machine.

          SUMMARY STEPS

            1.    vlan configuration 1

            2.    ipv6 snooping

            3.    ipv6 nd suppress

            4.    exit


          DETAILED STEPS
              Command or Action Purpose
            Step 1 vlan configuration 1


            Example:
            Controller(config)# vlan configuration 1
             

            Enters Vlan configuration mode.

             
            Step 2 ipv6 snooping


            Example:
            Controller(config-vlan)# ipv6 snooping
             

            Enables IPv6 snooping on the Vlan.

             
            Step 3 ipv6 nd suppress


            Example:
            Controller(config-vlan-config)# ipv6 nd suppress
             

            Enables the IPv6 ND suppress on the Vlan.

             
            Step 4 exit


            Example:
            Controller(config-vlan-config)# exit
            
             

            Saves the configuration and comes out of the Vlan configuration mode.

             

            Configuring IPv6 ND Suppress Policy (CLI)

            The IPv6 neighbor discovery (ND) multicast suppress feature stops as many ND multicast neighbor solicit (NS) messages as possible by dropping them (and responding to solicitations on behalf of the targets) or converting them into unicast traffic. This feature runs on a layer 2 switch or a wireless controller and is used to reduce the amount of control traffic necessary for proper link operations.

            When an address is inserted into the binding table, an address resolution request sent to a multicast address is intercepted, and the device either responds on behalf of the address owner or, at layer 2, converts the request into a unicast message and forwards it to its destination.

            Before You Begin
            SUMMARY STEPS

              1.    enable

              2.    configure terminal

              3.    ipv6 nd suppress policy


            DETAILED STEPS
                Command or Action Purpose
              Step 1 enable


              Example:
              Controller(config)# enable
               
              Enables privileged EXEC mode.
              • Enter your password if prompted.
               
              Step 2 configure terminal


              Example:
              
                          
                          
              Controller# configure terminal
              
              
               

              Enters the global configuration mode.

               
              Step 3 ipv6 nd suppress policy


              Example:
              Controller (config)# ipv6 nd suppress policy
               

              Defines the ND suppress policy name and enters ND suppress policy configuration mode.

               

              Configuring IPv6 Snooping on VLAN/PortChannel

              Neighbor Discover (ND) suppress can be enabled or disabled on either the VLAN or a switchport.

              Before You Begin

              SUMMARY STEPS

                1.    vlan config901

                2.    ipv6 nd suppress

                3.    end

                4.    interface gi1/0/1

                5.    ipv6 nd suppress

                6.    end


              DETAILED STEPS
                  Command or Action Purpose
                Step 1 vlan config901


                Example:
                Controller(config)# vlan config901
                 
                Creates a VLAN and enter the VLAN configuration mode  
                Step 2 ipv6 nd suppress


                Example:
                Controller(config-vlan)# ipv6 nd suppress
                 
                Applies the IPv6 nd suppress on VLAN.  
                Step 3 end


                Example:
                Controller(config-vlan)# end
                 
                Exits vlan configuration mode and enters the global configuration mode.  
                Step 4 interface gi1/0/1


                Example:
                Controller (config)# interface gi1/0/1
                 

                Creates a gigabitethernet port interface.

                 
                Step 5 ipv6 nd suppress


                Example:
                Controller(config-vlan)# ipv6 nd suppress
                 
                Applies the IPv6 nd suppress on the interface.  
                Step 6 end


                Example:
                Controller(config-vlan)# end
                 
                Exits vlan configuration mode and enters the global configuration mode.  

                Configuring IPv6 on Controller (CLI)

                Use this configuration example to configure IPv6 on an interface.

                Before You Begin

                Enable IPv6 on the client and IPv6 support on the wired infrastructure.

                SUMMARY STEPS

                  1.    interface vlan 1

                  2.    ip address fe80::1 link-local

                  3.    ipv6 enable

                  4.    end


                DETAILED STEPS
                    Command or Action Purpose
                  Step 1 interface vlan 1


                  Example:
                  Controller(config)# interface vlan 1
                  
                   

                  Creates a interface and enters interface configuration mode.

                   
                  Step 2 ip address fe80::1 link-local


                  Example:
                  Controller(config-if)# ip address 198.51.100.1 255.255.255.0
                     Controller(config-if)# ipv6 address fe80::1 link-local
                     Controller(config-if)# ipv6 address 2001:DB8:0:1:FFFF:1234::5/64 
                     Controller(config-if)# ipv6 address 2001:DB8:0:0:E000::F/64
                   

                  Configures IPv6 address on the interface using the link-local option.

                   
                  Step 3 ipv6 enable


                  Example:
                  Controller(config)# ipv6 enable
                  
                   

                  (Optional) Enables IPv6 on the interface.

                   
                  Step 4 end


                  Example:
                  Controller(config)# end
                   

                  Exits from the interface mode.

                   

                  Configuring DHCP Pool (CLI)

                  SUMMARY STEPS

                    1.    ipv6 dhcp pool Vlan21

                    2.    address prefix 2001:DB8:0:1:FFFF:1234::/64 lifetime 300 10

                    3.    dns-server 2001:100:0:1::1

                    4.    domain-name example.com

                    5.    end


                  DETAILED STEPS
                      Command or Action Purpose
                    Step 1 ipv6 dhcp pool Vlan21


                    Example:
                    Controller(config)# ipv6 dhcp pool vlan1
                    
                     

                    Enters the configuration mode and configures the IPv6 DHCP pool on the Vlan.

                     
                    Step 2 address prefix 2001:DB8:0:1:FFFF:1234::/64 lifetime 300 10


                    Example:
                    Controller(config-dhcpv6)# address prefix 2001:DB8:0:1:FFFF:1234::/64 lifetime 300 10
                    
                     

                    Enters the configuration-dhcp mode and configures the address pool and its lifetime on a Vlan.

                     
                    Step 3 dns-server 2001:100:0:1::1


                    Example:
                    Controller(config-dhcpv6)# dns-server 2001:20:21::1
                     

                    Configures the DNS servers for the DHCP pool.

                     
                    Step 4 domain-name example.com


                    Example:
                    Controller(config-dhcpv6)# domain-name example.com
                     

                    Configures the domain name to complete unqualified host names.

                     
                    Step 5 end


                    Example:
                    Controller(config)# end
                     

                    Returns to privileged EXEC mode. Alternatively, you can also press Ctrl-Z to exit global configuration mode.

                     

                    Configuring Stateless Auto Address Configuration Without DHCP (CLI)

                    SUMMARY STEPS

                      1.    interface vlan 1

                      2.    ip address fe80::1 link-local

                      3.    ipv6 enable

                      4.    no ipv6 nd managed-config-flag

                      5.    no ipv6 nd other-config-flag

                      6.    end


                    DETAILED STEPS
                        Command or Action Purpose
                      Step 1 interface vlan 1


                      Example:
                      Controller(config)# interface vlan 1
                      
                       

                      Creates a interface and enters interface configuration mode.

                       
                      Step 2 ip address fe80::1 link-local


                      Example:
                      Controller(config-if)# ip address 198.51.100.1 255.255.255.0
                         Controller(config-if)# ipv6 address fe80::1 link-local
                         Controller(config-if)# ipv6 address 2001:DB8:0:1:FFFF:1234::5/64 
                         Controller(config-if)# ipv6 address 2001:DB8:0:0:E000::F/64
                       

                      Configures IPv6 address on the interface using the link-local option.

                       
                      Step 3 ipv6 enable


                      Example:
                      Controller(config)# ipv6 enable
                      
                       

                      (Optional) Enables IPv6 on the interface.

                       
                      Step 4 no ipv6 nd managed-config-flag


                      Example:
                      Controller(config)#interface vlan 1
                      Controller(config-if)# no ipv6 nd managed-config-flag
                       

                      Ensures the attached hosts do not use stateful autoconfiguration to obtain addresses.

                       
                      Step 5 no ipv6 nd other-config-flag


                      Example:
                      Controller(config-if)# no ipv6 nd other-config-flag 
                       

                      Ensures the attached hosts do not use stateful autoconfiguration to obtain non-address options from DHCP (domain etc).

                       
                      Step 6 end


                      Example:
                      Controller(config)# end
                       

                      Returns to privileged EXEC mode. Alternatively, you can also press Ctrl-Z to exit global configuration mode.

                       

                      Configuring Stateless Auto Address Configuration With DHCP (CLI)

                      SUMMARY STEPS

                        1.    interface vlan 1

                        2.    ip address fe80::1 link-local

                        3.    ipv6 enable

                        4.    no ipv6 nd managed-config-flag

                        5.    ipv6 nd other-config-flag

                        6.    end


                      DETAILED STEPS
                          Command or Action Purpose
                        Step 1 interface vlan 1


                        Example:
                        Controller(config)# interface vlan 1
                        
                         

                        Creates a interface and enters interface configuration mode.

                         
                        Step 2 ip address fe80::1 link-local


                        Example:
                        Controller(config-if)# ip address 198.51.100.1 255.255.255.0
                           Controller(config-if)# ipv6 address fe80::1 link-local
                           Controller(config-if)# ipv6 address 2001:DB8:0:1:FFFF:1234::5/64 
                           Controller(config-if)# ipv6 address 2001:DB8:0:0:E000::F/64
                         

                        Configures IPv6 address on the interface using the link-local option.

                         
                        Step 3 ipv6 enable


                        Example:
                        Controller(config)# ipv6 enable
                        
                         

                        (Optional) Enables IPv6 on the interface.

                         
                        Step 4 no ipv6 nd managed-config-flag


                        Example:
                        Controller(config)#interface vlan 1
                        Controller(config-if)# no ipv6 nd managed-config-flag
                         

                        Ensures the attached hosts do not use stateful autoconfiguration to obtain addresses.

                         
                        Step 5 ipv6 nd other-config-flag


                        Example:
                        Controller(config-if)# no ipv6 nd other-config-flag 
                         

                        Ensures the attached hosts do not use stateful autoconfiguration to obtain non-address options from DHCP (domain etc).

                         
                        Step 6 end


                        Example:
                        Controller(config)# end
                         

                        Exits from the interface mode.

                         

                        Configuring Stateful DHCP Locally (CLI)

                        This interface configuration is for a Cisco IOS IPv6 router implementing stateful DHCPv6 on a local Controller

                        Before You Begin
                        SUMMARY STEPS

                          1.    configure terminal

                          2.    ipv6 unicast-routing

                          3.    ipv6 dhcp pool IPv6_DHCPPOOL

                          4.    address prefix 2001:DB8:0:1:FFFF:1234::/64

                          5.    dns-server 2001:100:0:1::1

                          6.    domain-name example.com

                          7.    exit

                          8.    interface vlan1

                          9.    description IPv6-DHCP-Stateful

                          10.    ipv6 address 2001:DB8:0:20::1/64

                          11.    ip address 192.168.20.1 255.255.255.0

                          12.    ipv6 nd prefix 2001:db8::/64 no-advertise

                          13.    ipv6 nd managed-config-flag

                          14.    ipv6 nd other-config-flag

                          15.    ipv6 dhcp server IPv6_DHCPPOOL


                        DETAILED STEPS
                            Command or Action Purpose
                          Step 1 configure terminal


                          Example:
                          
                                      
                                      
                          Controller# configure terminal
                          
                          
                           

                          Enters the global configuration mode.

                           
                          Step 2 ipv6 unicast-routing


                          Example:
                          Controller(config)# ipv6 unicast-routing
                           

                          Configures IPv6 for unicasting.

                           
                          Step 3 ipv6 dhcp pool IPv6_DHCPPOOL


                          Example:
                          Controller (config)# ipv6 dhcp pool IPv6_DHCPPOOL
                           

                          Enters the configuration mode and configures the IPv6 DHCP pool on the VLAN.

                           
                          Step 4 address prefix 2001:DB8:0:1:FFFF:1234::/64


                          Example:
                          Controller (config-dhcpv6)# address prefix
                          2001:DB8:0:1:FFFF:1234::/64
                           

                          Specifies the address range to provide in the pool.

                           
                          Step 5 dns-server 2001:100:0:1::1


                          Example:
                          Controller (config-dhcpv6)# dns-server 2001:100:0:1::1
                           

                          Provides the DNS server option to DHCP clients.

                           
                          Step 6 domain-name example.com


                          Example:
                          Controller (config-dhcpv6)# domain-name example.com
                           

                          Provides the domain name option to DHCP clients.

                           
                          Step 7 exit


                          Example:
                          Controller (config-dhcpv6)# exit
                           

                          Returns to the previous mode.

                           
                          Step 8 interface vlan1


                          Example:
                          Controller (config)# interface vlan 1
                           

                          Enters the interface mode to configure the stateful DHCP.

                           
                          Step 9 description IPv6-DHCP-Stateful


                          Example:
                          Controller (config-if)# description IPv6-DHCP-Stateful
                           

                          Enter description for the stateful IPv6 DHCP.

                           
                          Step 10 ipv6 address 2001:DB8:0:20::1/64


                          Example:
                          Controller (config-if)# ipv6 address 2001:DB8:0:20::1/64
                           

                          Enters the IPv6 address for the stateful IPv6 DHCP.

                           
                          Step 11 ip address 192.168.20.1 255.255.255.0


                          Example:
                          Controller (config-if)# ip address 192.168.20.1 255.255.255.0
                           

                          Enters the IPv6 address for the stateful IPv6 DHCP.

                           
                          Step 12 ipv6 nd prefix 2001:db8::/64 no-advertise


                          Example:
                          Controller (config-if)# ipv6 nd prefix 2001:db8::/64
                          no-advertise
                           

                          Configures the IPv6 routing prefix advertisement that must not be advertised.

                           
                          Step 13 ipv6 nd managed-config-flag


                          Example:
                          Controller (config-if)# ipv6 nd managed-config-flag
                           

                          Configures IPv6 interfaces neighbor discovery to allow the hosts to uses DHCP for address configuration.

                           
                          Step 14 ipv6 nd other-config-flag


                          Example:
                          Controller (config-if)# ipv6 nd other-config-flag
                           

                          Configures IPv6 interfaces neighbor discovery to allow the hosts to uses DHCP for non-address configuration.

                           
                          Step 15 ipv6 dhcp server IPv6_DHCPPOOL


                          Example:
                          Controller (config-if)# ipv6 dhcp server IPv6_DHCPPOOL
                           

                          Configures the DHCP server on the interface.

                           

                          Configuring Stateful DHCP Externally (CLI)

                          This interface configuration is for a Cisco IOS IPv6 router implementing stateful DHCPv6 on an external DHCP server.

                          Before You Begin
                          SUMMARY STEPS

                            1.    configure terminal

                            2.    ipv6 unicast-routing

                            3.    dns-server 2001:100:0:1::1

                            4.    domain-name example.com

                            5.    exit

                            6.    interface vlan1

                            7.    description IPv6-DHCP-Stateful

                            8.    ipv6 address 2001:DB8:0:20::1/64

                            9.    ip address 192.168.20.1 255.255.255.0

                            10.    ipv6 nd prefix 2001:db8::/64 no-advertise

                            11.    ipv6 nd managed-config-flag

                            12.    ipv6 nd other-config-flag

                            13.    ipv6 dhcp_relaydestination 2001:DB8:0:20::2


                          DETAILED STEPS
                              Command or Action Purpose
                            Step 1 configure terminal


                            Example:
                            
                                        
                                        
                            Controller# configure terminal
                            
                            
                             

                            Enters the global configuration mode.

                             
                            Step 2 ipv6 unicast-routing


                            Example:
                            Controller(config)# ipv6 unicast-routing
                             

                            Configures the IPv6 for unicasting.

                             
                            Step 3 dns-server 2001:100:0:1::1


                            Example:
                            Controller (config-dhcpv6)# dns-server 2001:100:0:1::1
                             

                            Provides the DNS server option to DHCP clients.

                             
                            Step 4 domain-name example.com


                            Example:
                            Controller (config-dhcpv6)# domain-name example.com
                             

                            Provides the domain name option to DHCP clients.

                             
                            Step 5 exit


                            Example:
                            Controller (config-dhcpv6)# exit
                             

                            Returns to the previous mode.

                             
                            Step 6 interface vlan1


                            Example:
                            Controller (config)# interface vlan 1
                             

                            Enters the interface mode to configure the stateful DHCP.

                             
                            Step 7 description IPv6-DHCP-Stateful


                            Example:
                            Controller (config-if)# description IPv6-DHCP-Stateful
                             

                            Enter description for the stateful IPv6 DHCP.

                             
                            Step 8 ipv6 address 2001:DB8:0:20::1/64


                            Example:
                            Controller (config-if)# ipv6 address 2001:DB8:0:20::1/64
                             

                            Enters the IPv6 address for the stateful IPv6 DHCP.

                             
                            Step 9 ip address 192.168.20.1 255.255.255.0


                            Example:
                            Controller (config-if)# ip address 192.168.20.1 255.255.255.0
                             

                            Enters the IPv6 address for the stateful IPv6 DHCP.

                             
                            Step 10 ipv6 nd prefix 2001:db8::/64 no-advertise


                            Example:
                            Controller (config-if)# ipv6 nd prefix 2001:db8::/64
                            no-advertise
                             

                            Configures the IPv6 routing prefix advertisement that must not be advertised.

                             
                            Step 11 ipv6 nd managed-config-flag


                            Example:
                            Controller (config-if)# ipv6 nd managed-config-flag
                             

                            Configures IPv6 interfaces neighbor discovery to allow the hosts to uses DHCP for address configuration.

                             
                            Step 12 ipv6 nd other-config-flag


                            Example:
                            Controller (config-if)# ipv6 nd other-config-flag
                             

                            Configures IPv6 interfaces neighbor discovery to allow the hosts to uses DHCP for non-address configuration.

                             
                            Step 13 ipv6 dhcp_relaydestination 2001:DB8:0:20::2


                            Example:
                            Controller (config-if)# ipv6 dhcp_relay destination 2001:DB8:0:20::2
                             

                            Configures the DHCP server on the interface.

                             

                            Monitoring IPv6 Clients (GUI)

                            To view the IPv6 clients associated with the Controller

                            Before You Begin
                            Select Monitor > Clients

                            The Clients page is displayed. The Clients page contains the following details:

                            • Client MAC Address— Displays the MAC address of the client.
                            • AP Name— Displays the access point name to which the client is connected to.
                            • WLAN— Displays the WLAN associated with the client.
                            • State— Displays the client authentication.
                            • Protocol— Displays the protocol used.

                            To view the client related general details, click the Client MAC Address parameter in the Clients page. The Client > Detail page displays IPv6 addresses of the client under the General tab.


                            Verifying IPv6 Address Learning Configuration

                            This example displays the output of the show ipv6 dhcp pool command. This command displays the IPv6 service configuration on the controller. The vlan 21 configured pool detail displays 6 clients that are currently using addresses from the pool.

                            SUMMARY STEPS

                              1.    show ipv6 dhcp pool


                            DETAILED STEPS
                                Command or Action Purpose
                              Step 1 show ipv6 dhcp pool


                              Example:
                              Controllershow ipv6 dhcp pool 
                              DHCPv6 pool: vlan21
                              Address allocation prefix: 2001:DB8:0:1:FFFF:1234::/64 valid 86400 preferred 86400 (6 in use, 0 conflicts)
                              DNS server: 2001:100:0:1::1
                              Domain name: example.com
                              Active clients: 6
                              
                               

                              Displays the IPv6 service configuration on the controller.

                               

                              Additional References

                              Related Documents

                              Related Topic Document Title
                              IPv6 command reference IPv6 Command Reference (Cisco WLC 5700 Series)
                              IP command reference IP Command Reference (Cisco WLC 5700 Series)

                              Error Message Decoder

                              Description Link

                              To help you research and resolve system error messages in this release, use the Error Message Decoder tool.

                              https:/​/​www.cisco.com/​cgi-bin/​Support/​Errordecoder/​index.cgi

                              MIBs

                              MIB MIBs Link
                              All supported MIBs for this release.

                              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 website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies.

                              To receive security and technical information about your products, you can subscribe to various services, such as the Product Alert Tool (accessed from Field Notices), the Cisco Technical Services Newsletter, and Really Simple Syndication (RSS) Feeds.

                              Access to most tools on the Cisco Support website requires a Cisco.com user ID and password.

                              http:/​/​www.cisco.com/​support

                              Feature Information for IPv6 Client Address Learning

                              This table lists the features in this module and provides links to specific configuration information:

                              Feature

                              Release

                              Modification

                              IPv6 Client Address Learning Functionality

                              Cisco IOS XE 3.2SE

                              This feature was introduced.