Managing HP Serviceguard for Linux, Sixth Edition, August 2006

Understanding Hardware Configurations for Serviceguard for Linux
Redundant Network Components
Chapter 2 27
Redundant Network Components
To eliminate single points of failure for networking, each subnet accessed
by a cluster node is required to have redundant network interfaces.
Redundant cables are also needed to protect against cable failures. Each
interface card is connected to a different cable and hub or switch.
Network interfaces are allowed to share IP addresses through a process
known as channel bonding. A sample network configuration is
described further in the following sections. For a complete list of
supported networks, refer to the HP Serviceguard Release Notes for your
version of the product.
Redundant Ethernet Configuration
The use of redundant network components is shown in Figure 2-1, which
is an Ethernet configuration.
Figure 2-1 Redundant LANs
In Linux configurations, the use of symmetrical LAN configurations is
strongly recommended, with the use of redundant hubs or switches to
connect Ethernet segments. The software bonding configurations also
should be identical on both nodes, with the active interfaces being
connected to the same hub or switch. (Bonding configuration is described
in detail in Chapter 5.)