3Com 7757 Configuration Manual page 707

Table 563 Switch roles in the cluster
Role Configuration
Management device
■
■
Member device Normally, a member device is not
configured with a public IP
address
Candidate device Normally, a candidate device is
not configured with a public IP
address
The switch roles are switched according to the following rules:
Figure 183 Role switching roles
Management device
Each cluster has one (and only one) management device. A management
■
device collects NDP/NTDP information to discover and determine candidate
devices, which can be then added into the cluster through manual
configurations.
A candidate device becomes a member device after being added to a cluster.
■
Configured with a public IP
address.
Receive management
commands that a user sends
through the public network
and process the received
commands
Candidate device
Cluster Overview
Description
Provide management interfaces
■
for all switches in the cluster
Manage member devices by
■
redirecting commands, that is,
forward the commands to the
intended member devices for
processing
Provide the following
■
functions, including neighbor
discovery, topology
information collection, cluster
management, and cluster state
maintenance, and support all
types of FTP servers and SNMP
host proxies
Member in the cluster
■
Neighbor discovery, being
■
managed by the management
device, running commands
forwarded by proxies, and
failure/log reporting
A candidate device is a switch that
does not belong to any cluster,
although it can be added to a
cluster
Member device
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