Cluster Management Overview 907
Figure 268 Role change in a cluster
A device in a cluster changes its role according to the following rules:
■ 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 configuration.
■ 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.
How a Cluster Works Switch Clusteringv2 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.
Cluster management involves topology information collection and the
establishment and maintenance of a cluster. Topology information collection and
cluster maintenance are independent from each other, with the former starting
before the cluster is created:
■ All devices use NDP to collect the information of the directly connected
neighbors, including their software version, host name, MAC address and port
number.
■ The management device uses NTDP to collect the information of the devices
within user-specified hops and the topology information of all devices and
specify the candidate devices of the cluster.
■ The management device adds or deletes a member device and modifies cluster
management configuration according to the candidate device information
collected through NTDP.
Candidate device
Management device Member device
Joins a
cluster
Leaves a
cluster
Designates
as a
management
device
Cancels the
designated
management
device
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