Communication Paths; Primary Communications Path - Tyco iSTAR Ultra Installation And Configuration Manual

Communication Paths

Communication Paths

Primary Communications Path

3–8 iSTAR Ultra Installation and Configuration Guide
The master controller connects to the host over a primary communication path. An optional
secondary path can be configured to ensure continuous host communication.
The primary path is the first communication path that clusters use to establish
communications with the host. The master is the only controller in a cluster that passes
messages between the host and cluster members. Cluster members do not communicate with
the host directly; they communicate with the host through the master. Connections are
established in the following bottom-to-top order:
Cluster members are responsible for establishing connections with the master.

The master is responsible for establishing a connection with the host.

The Connection type is how the master connects to the host. Allowable types are network.
Cluster members are connected to the master only via a network connection.
Figure 3-5 shows the primary path for cluster member A. In this case, the master/host
connection type is network.
Figure 3-5: The Primary Path
Host
4
Network
Switch
3
1
2
Master
Cluster
Member
Ethernet
Cluster
Member