C•CURE 800/8000 Hardware Configuration Guide - Tyco Security ...

Maintaining Cluster Communications for iSTAR Classic & ProMaintaining Cluster Communications for iSTAR Classic & ProMaintaining cluster communications involves establishing and maintainingconnections via the primary communications path. If the primary connectionis lost, the secondary communications path can sometimes be used to reestablishcluster communications. This section describes how theconfiguration of the secondary communications determines the way in whichcluster communications are re-established.Losing a Connection with the HostIf the master loses its connection with the host, the following configurations ofthe secondary communications path determine how cluster communicationsare re-established:Secondary Connection Between the Master and HostIf the master loses its connection with the host and the secondarycommunications path is another connection between the master and the host,as shown in Figure 1-13 on page 1-36 and Figure 1-14 on page 1-37, thefollowing occurs:• Cluster members continue to communicate with the master.• The master continues to pass cluster members’ messages to the host.• However, the master uses the secondary communications path tocommunicate with the host.Example:If the secondary path is a dialup connection between the master and host,the master uses the dialup connection to communicate with the host.C•CURE 800/8000 Hardware Configuration Guide 1–35