D-Link DFL-1660 User Manual page 539

11.4. HA Issues
Chapter 11. High Availability
router.
If OSPF is to work then there must be another designated router available in the same OSPF area as
the cluster. Ideally, there will also be a second, backup designated router to provide OSPF metrics if
the main designated router should fail.
PPPoE Tunnels and DHCP Clients
For reasons connected with the shared IP addresses of an HA cluster, PPPoE tunnels and DHCP
clients should not be configured in an HA cluster.
IPv6 Support
Support for IPv6 addresses is discussed in Section 3.2, "IPv6 Support".
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