Managing Serviceguard Fifteenth Edition, reprinted May 2008

Understanding Serviceguard Hardware Configurations
Redundant Network Components
Chapter 2 39
Rules and Restrictions
• A single subnet cannot be configured on different network interfaces
(NICs) on the same node.
• For IPv4 subnets, Serviceguard does not support different subnets on
the same LAN interface.
— For IPv6, Serviceguard supports up to two subnets per LAN
interface (site-local and global).
• Serviceguard does support different subnets on the same bridged
network (this applies at both the node and the cluster level).
• Serviceguard does not support using networking tools such as
ifconfig or the configuration file /etc/rc.config.d/netconf to
add IP addresses to network interfaces that are configured into the
Serviceguard cluster, unless those IP addresses themselves will be
immediately configured into the cluster as stationary IP
addresses.
CAUTION If you configure any address other than a stationary IP address on a
Serviceguard network interface, it could collide with a relocatable
package IP address assigned by Serviceguard. See “Stationary and
Relocatable IP Addresses” on page 99.
(Oracle VIPs are an exception to this rule; such configurations
require the HP add-on product Serviceguard Extension for Oracle
RAC).
— Similarly, Serviceguard does not support using networking tools
to move or reconfigure any IP addresses configured into the
cluster.
Doing so leads to unpredictable results because the Serviceguard
view of the configuration is different from the reality.