3Com Switch 4800G 24-Port Configuration Manual page 906

906 C 73: C
HAPTER LUSTER
Roles in a Cluster
M C
ANAGEMENT ONFIGURATION
Figure 267 Network diagram for a cluster
Network
management
device
Network
Management
device
Member
device
Cluster
Member
device
Member
device
Cluster management offers the following advantages:
Saving public IP address resource
■
Simplifying configuration and management tasks. By configuring a public IP
■
address on the management device, you can configure and manage a group of
member devices on the management device without the trouble of logging
onto each device separately.
Providing topology discovery and display function, which is useful for network
■
monitoring and debugging
Allowing simultaneous software upgrading and parameter configuring on
■
multiple devices, free of topology and distance limitations
The devices in a cluster play different roles according to their different functions
and status. You can specify the role a device plays. The following three roles exist
in a cluster: management device, member device, and candidate device.
Management device: The device providing management interfaces for all
■
devices in the cluster and the only device configured with a public IP address.
Any configuration, management, and monitoring of the member devices in a
cluster can only be implemented through the management device. When a
device is specified as the management device, it collects Neighbor Discovery
Protocol (NDP) and Neighbor Topology Discovery Protocol (NTDP) information
to discover and define a candidate device.
Member device: The device being managed by the management device in a
■
cluster.
Candidate device: A device that does not belong to any cluster but can be
■
added to a cluster. Different from a member device, its topology information
has been collected by the management device but it has not been added to the
cluster.
69.110.1.100
69.110.1.1
Candidate
device