3Com 4200G 12-Port Configuration Manual page 280

266 C 32: C
HAPTER LUSTER
Cluster Roles
C
ONFIGURATION
HGMP V2 provides the following functions:
Topology discovery: HGMP V2 implements NDP (neighbor discovery protocol) to
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discover the information about the directly connected neighbor devices, including
device type, software/hardware version, connecting port and so on. The
information such as device ID, port mode (duplex or half duplex), product version,
and BootROM version can also be given.
Topology information collection: HGMP V2 implements NTDP (neighbor topology
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discovery protocol) to collect the information about device connections and
candidate devices within a specified hop range.
Member recognition: A management device can locate and recognize the member
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devices in the cluster and then deliver configuration and management commands
to them.
Member management: You can add a device to a cluster or remove a device from
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a cluster on the management device. You can also configure management device
authentication and handshake interval for a member device on the management
device.
Cluster-related configurations are described in the following sections.
According to their functions and status in a cluster, switches in the cluster play
different roles. You can specify the role a switch plays. A switch also changes its role
according to specific rules.
Following three cluster roles exist: management device, member device, and
candidate device.
Table 234 Cluster role
Role Configurations
Management
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device
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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.
Figure 84 shows the role changing rule.
Functions
Configured with a public
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IP address.
Receiving management
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commands from the
public network and
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processing the received
commands
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A candidate device is a switch that does not
belong to any cluster, although it can be added
to a cluster.
Providing management interfaces for all
switches in the cluster
Managing member devices by redirecting
commands
Forwarding commands to the intended
member devices
Neighbor discovery, topology information
collection, cluster management, cluster state
maintenance, and proxies
Cluster member
Neighbor discovery, being managed by the
management device, running commands
forwarded by proxies, and failure/log
reporting.