IBM AIX HACMP SG24-5131-00 Hardware User Manual page 55

The following diagram shows a cluster consisting of two nodes and a client. A
single public network connects the nodes and the client, and the nodes are
linked point-to-point by a private high-speed SOCC connection that provides
an alternate path for cluster and lock traffic should the public network fail.
Figure 7. A Point-to-Point Connection
2.4.3.2 Networks
Networks in an HACMP cluster are identified by name and attribute.
Network Name
The network name is a symbolic value that identifies a network in an HACMP
for AIX environment. Cluster processes use this information to determine
which adapters are connected to the same physical network. In most cases,
the network name is arbitrary, and it must be used consistently. If several
adapters share the same physical network, make sure that you use the same
network name when defining these adapters.
Network Attribute
A TCP/IP network's attribute is either public or private.
Public A public network connects from two to 32 nodes and allows clients to
monitor or access cluster nodes. Ethernet, Token-Ring, FDDI, and
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Cluster Planning