Managing HP Serviceguard A.11.20.20 for Linux, May 2013

Figure 4 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.
2.2.3 Cross-Subnet Configurations
As of Serviceguard A.11.18 or later, 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.
2.2.3.1 Configuration Tasks
Cluster and package configuration tasks are affected as follows:
• You must use the -w full option to cmquerycl discover actual or potential nodes and
subnets across routers.
• You must configure two new parameters in the package configuration file to allow packages
to fail over across subnets:
◦ ip_subnet_node - to indicate which nodes the subnet is configured on
◦ monitored_subnet_access - to indicate whether the subnet is configured on all nodes
(FULL) or only some (PARTIAL)
(For legacy packages, see “Configuring Cross-Subnet Failover” (page 239).)
2.2 Redundant Network Components 27