Managing Serviceguard Eighteenth Edition, September 2010

Network Communication Failure
An important element in the cluster is the health of the network itself. As it continuously
monitors the cluster, each node listens for heartbeat messages from the other nodes
confirming that all nodes are able to communicate with each other. If a node does not
hear these messages within the configured amount of time, a node timeout occurs; see
“What Happens when a Node Times Out” (page 117).
120 Understanding Serviceguard Software Components