Managing HP Serviceguard for Linux, Sixth Edition, August 2006

Understanding Serviceguard Software Components
How the Network Manager Works
Chapter 372
After the failure of a card, messages are still carried on the bonded LAN
and are received on the other node, but now eth1 has become active in
bond0 on node1. This situation is shown in Figure 3-19.
Figure 3-19 Bonded NICs After Failure
Various combinations of Ethernet card types (single or dual-ported) and
bond groups are possible, but it is vitally important to remember that at
least two physical cards must be used in any combination of channel
bonds to avoid a single point of failure for heartbeat connections.