Configuring IPv6 Neighbor Discovery Local Address Pools

The IPv6 local address pool for Neighbor Discovery router advertisements is an object that contains information about prefix configuration parameters and guidelines that govern the assignment of these prefixes to requesting PPPv6 subscribers. If you configured an interface for the Neighbor Discovery router advertisements prefix, the prefix assigned to that interface takes precedence over the prefix or range of prefixes configured at the router level in an IPv6 local address pool.

To configure an IPv6 local address pool to be used for Neighbor Discovery router advertisements:

1. Enable the IPv6 local address pool for Neighbor Discovery router advertisements to assign prefixes to the requesting PPPv6 subscribers.
   host1(config)#ipv6 address-pool ndra
2. Configure the name of the IPv6 local address pool for Neighbor Discovery router advertisements from which the delegating router assigns prefixes to the Neighbor Discovery router advertisements client or requesting router.
   host1(config)#ipv6 local ndra-pool ndra-pool1

   Note: You must enable the IPv6 local address for Neighbor Discovery router advertisements feature to be able to configure IPv6 local address pools.

3. Specify the IPv6 Neighbor Discovery router advertisements prefix range from which prefixes can be allocated to the Neighbor Discovery router advertisements client.

   Configure the prefix range by specifying the starting and ending IPv6 prefixes of the range. The prefix length should be /64. Any attempt to configure a prefix length other than /64 will show an error message.

   host1(config-v6-NdRa)#ndraprefix 3003:3003::/64 3003:3003:0:1000::/64
4. Set certain prefixes for Neighbor Discovery router advertisements to be excluded from being allocated to the requesting PPPv6 subscribers. You can exclude addresses that are assigned to local interfaces. You can exclude specific prefixes or a range of prefixes from allocation to clients.
   host1(config-v6-NdRa)#exclude-ndraprefix 5005:5005:2::/64 5005:5005:a::/64

   In this example, all prefixes between the starting prefix of the range 5005:5005:2::/64, and the ending prefix of the range 5005:5005:a::/64, are excluded from allocation to clients.

5. Map the domain name to the IPv6 local address pool, which is used for Neighbor Discovery router advertisements. If the authentication server returns the prefix pool name in the Framed-Ipv6-Pool attribute of the RADIUS-Accept-Request message, this value overrides the IPv6 local pool configured using the ipv6-ndra-pool-name command.
   host1(config)#aaa domain-map westford.com host1(config-domain-map)#ipv6-ndra-pool-name local_addr_pool

   For more information about mapping domain names to the IPv6 local address pool, see ipv6-ndra-pool-name.