H3C S3100 8C SI Operation Manual page 588

Operation Manual – Stack-Cluster
H3C S3100 Series Ethernet Switches
Candidate device
Figure 2-2
Designates as a
management switch
Management switch
Figure 2-2 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 S3100 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.
Role Configuration
Normally, a
candidate
device is not
assigned an
external IP
address
illustrates the state machine of cluster role.
Candidate Switch
Cancels the
designated
Management
switch
Candidate device refers to the devices
that do not belong to any clusters but are
cluster-capable.
Leaves a
cluster
Joins a
cluster
Member switch
2-3
Chapter 2 Cluster
Function