Managing HP Serviceguard for Linux, Seventh Edition, July 2007

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. See “Implementing Channel Bonding (Red
Hat)” on page 156 or “Implementing Channel Bonding (SUSE)” on
page 160.
Serviceguard supports a maximum of 30 network interfaces per node.
For this purpose an interface is defined as anything represented as a
primary interface in the output of ifconfig, so the total of 30 can
comprise any combination of physical LAN interfaces or bonding
interfaces. (A node can have more than 30 such interfaces, but only 30
can be part of the cluster configuration.)
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