Introduction To Cluster - H3C S7500 Series Operation Manual

Operation Manual – Cluster
H3C S7500 Series Ethernet Switches

1.1.4 Introduction to Cluster

I. Introduction to cluster configuration
A cluster has one (and only one) management device. Note the following points when
creating a cluster:
You need to designate a management device first. The management device of a
cluster is the portal of the cluster. That is, any operations performed in external
networks and intended for the member devices of a cluster, such as accessing,
configuring, managing, and monitoring, can only be implemented through the
management device.
The management device of a cluster recognizes and controls all the member
devices in the cluster, no matter where they are located in the network or how they
are connected.
The management device collects topology information about all the member and
candidate devices to provide useful information for users to establish a cluster.
The management device manages and monitors the devices in the cluster by
collecting and processing NDP/NTDP packets. NDP/NTDP packets contain
network topology information.
All the above-mentioned operations need the support of the cluster function.
Note:
You need to enable the cluster function and configure cluster parameters on a
management device. However, you only need to enable the cluster function on the
member devices and candidate devices.
II. Introduction to function of cluster
Cluster provides the function of batch management for the switches in the network. It
provides external management and maintenance applications, including SNMP,
command line, program and data loading, log reporting and alarm reporting. These
applications
external-to-internal applications. All the applications are processed according to the
following procedures:
The communication between the management device and member device in the
cluster is implemented through packet interaction in the management VLAN.
The communication between the cluster and the external server is implemented
by the Layer 3 interface of the cluster management VLAN.
When the member device in the cluster communicates with the external server,
the member device transmits the data to the management device first, and then
can be divided
1-4
into internal-to-external
Chapter 1 Cluster
applications and