z To implement NTDP, you need to enable NTDP both globally and on specific ports on themanagement device, and configure NTDP parameters.z On member/candidate devices, you only need to enable NTDP globally and on specific ports.z Member and candidate devices adopt the NTDP settings of the management device.Introduction to ClusterA cluster must have one and only one management device. Note the following when creating a cluster:z You need to designate a management device for the cluster. The management device of a clusteris the portal of the cluster. That is, any operations from outside the network intended for themember devices of the cluster, such as accessing, configuring, managing, and monitoring, canonly be implemented through the management device.z The management device of the cluster recognizes and controls all the member devices in thecluster, no matter where they are located in the network and how they are connected.z The management device collects topology information about all member/candidate devices toprovide useful information for you to establish the cluster.z By collecting NDP/NTDP information, the management device learns network topology, so as tomanage and monitor network devices.z Before performing any cluster-related configuration task, you need to enable the cluster functionfirst.On the management device, you need to enable the cluster function and configure cluster parameters.On the member/candidate devices, however, you only need to enable the cluster function so that theycan be managed by the management device.Cluster maintenance1) Adding a candidate device to a clusterTo create a cluster, you need to determine the device to operate as the management device first. Themanagement device discovers and determines candidate devices through NDP and NTDP, and addsthem to the cluster. You can also add candidate devices to a cluster manually.After a candidate device is added to a cluster, the management device assigns a member number anda private IP address (used for cluster management) to it.2) Communications within a clusterIn a cluster, the management device maintains the connections to the member devices throughhandshake packets. Figure 48-3 illustrates the state machine of the connection between themanagement device and a member device.48-6
