How A Cluster Works - H3C S5600 Series Operation Manual

Operation Manual – Cluster
H3C S5600 Series Ethernet Switches
Figure 1-2 State machine of cluster role
A candidate device becomes a management device when you create a cluster on
it. Note that a cluster must have one (and only one) management device. On
becoming a management device, the device collects network topology information
and tries to discover and determine candidate devices, which can then be added
to the cluster through configurations.
A candidate device becomes a member device after being added to a cluster.
A member device becomes a candidate device after it is removed from the cluster.
A management device becomes a candidate device only after the cluster is
removed.
Note:
After you create a cluster on an S5600 switch, the switch collects the network topology
information periodically and adds the candidate switches it finds to the cluster. The
interval for a management device to collect network topology information is determined
by the NTDP timer. If you do not want the candidate switches to be added to a cluster
automatically, you can set the topology collection interval to 0 by using the ntdp timer
command. In this case, the switch does not collect network topology information
periodically.

1.1.3 How a Cluster Works

HGMPv2 consists of the following three protocols:
Neighbor Discovery Protocol (NDP)
Neighbor Topology Discovery Protocol (NTDP)
Cluster
A cluster configures and manages the devices in it through the above three protocols.
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Chapter 1 Cluster