Managing Serviceguard 14th Edition, June 2007

IPv6 Network Support
Network Configuration Restrictions
Appendix H 513
NOTE Even though link-local IP addresses are not supported in the
Serviceguard cluster configuration, the primary link-local address on the
Serviceguard primary interface will be switched over the standby during
a local switch. This is because of two requirements: First, the dual stack
(IPv4/IPv6) kernel requires that the primary IP address associated with
an interface must always be a link-local address. Second, Serviceguard
requires that the site-local and global IPs be switched to the standby
network interface.