Operation Manual – Stack-ClusterH3C S3100 Series Ethernet Switches Chapter 2 Cluster2-3Role Configuration FunctionCandidate deviceNormally, acandidatedevice is notassigned anexternal IPaddressCandidate device refers to the devicesthat do not belong to any clusters but arecluster-capable.Figure 2-2 illustrates the state machine of cluster role.Candidate SwitchDesignates as amanagement switchMember switchManagement switchCancels thedesignatedManagementswitchJoins aclusterLeaves aclusterFigure 2-2 State machine of cluster rolez A candidate device becomes a management device when you create a cluster onit. Note that a cluster must have one (and only one) management device. Onbecoming a management device, the device collects network topology informationand tries to discover and determine candidate devices, which can then be addedto the cluster through configurations.z A candidate device becomes a member device after being added to a cluster.z A member device becomes a candidate device after it is removed from the cluster.z A management device becomes a candidate device only after the cluster isremoved.Note:After you create a cluster on an S3100 switch, the switch collects the network topologyinformation periodically and adds the candidate switches it finds to the cluster. Theinterval for a management device to collect network topology information is determinedby the NTDP timer. If you do not want the candidate switches to be added to a clusterautomatically, you can set the topology collection interval to 0 by using the ntdp timercommand. In this case, the switch does not collect network topology informationperiodically.
