Managing HP Serviceguard for Linux Ninth Edition, April 2009

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 configuration should be identical on each node, with the active
interfaces connected to the same hub or switch.
Cross-Subnet Configurations
As of Serviceguard A.11.18 it is possible to configure multiple subnets, joined by a
router, both for the cluster heartbeat and for data, with some nodes using one subnet
and some another.
A cross-subnet configuration allows:
• Automatic package failover from a node on one subnet to a node on another
• A cluster heartbeat that spans subnets.
32 Understanding Hardware Configurations for Serviceguard for Linux