Enabling DHCPv6–relay operation

For the DHCPv6 relay agent to function on the routing switch, you must complete the following steps:

  1. Ensure that there is a route configured between a DHCPv6 server and the routing switch and that the server is configured to support host requests forwarded from the routing switch.
  2. For each VLAN on which you want the routing switch to provide DHCPv6-relay services, determine the helper addresses the relay agent should have for forwarding client DHCPv6 requests to reachable DHCPv6 servers. You can configure one or more helper addresses and can use either or both of the following types:
  3. In each VLAN context where DHCPv6-relay service is needed, use the ipv6 helper-address unicast / multicast command to configure one or more DHCPv6 helper addresses.
  4. In the global config context, use the dhcpv6-relay command to globally enable DHCPv6 relay on the routing switch.
  5. If IPv6 routing is not already enabled on the routing switch, use the ipv6 unicast-routing command in the global config context to enable IPv6 routing.
  6. On each VLAN where you have configured a helper address, ensure that the target DHCPv6 server is reachable.