3Com 4200G 12-Port, Configuration Manual

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266 C
HAPTER
32: C
LUSTER
C
ONFIGURATION
HGMP V2 provides the following functions:
■
Topology discovery: HGMP V2 implements NDP (neighbor discovery protocol) to
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
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
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
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.
Cluster Roles 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.
Figure 84 shows the role changing rule.
Table 234 Cluster role
Role Configurations Functions
Management
device
■
Configured with a public
IP address.
■
Receiving management
commands from the
public network and
processing the received
commands
■
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
Member device Normally, a member device
is not configured with a
public IP address.
■
Cluster member
■
Neighbor discovery, being managed by the
management device, running commands
forwarded by proxies, and failure/log
reporting.
Candidate device Normally, a candidate device
is not configured with a
public IP address.
A candidate device is a switch that does not
belong to any cluster, although it can be added
to a cluster.