Managing HP Serviceguard for Linux, Tenth Edition, September 2012

Figure 23 Bonded NICs
Node1
Node2
bond0:
eth0
eth1
bond0:
eth0
eth1
active
active
Crossover cable
Hub
Hub
In the bonding model, individual Ethernet interfaces are slaves, and the bond is the
master. In the basic high availability configuration (mode 1), one slave in a bond assumes
an active role, while the others remain inactive until a failure is detected. (In Figure 3-18,
both eth0 slave interfaces are active.) It is important that during configuration, the active
slave interfaces on all nodes are connected to the same hub. If this were not the case,
then normal operation of the LAN would require the use of the crossover between the
hubs and the crossover would become a single point of failure.
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 24.
How the Network Manager Works 73