Introduction To Cluster Roles - 3Com 5500-SI Configuration Manual

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HAPTER LUSTERING
Introduction to Cluster
Roles
When the NDP on the member device finds changes of neighbors, it will advertise the
changes to the management device by handshake packets. The management device
can run NTDP to collect the specified topology information and show the network
topology changes in time.
On a management device, you need to enable system NTDP and port NTDP, and
configure the NTDP parameters as well. However, for a member device, you only need
to enable system NTDP and the corresponding port NTDP. As the protocol runs, the
member device will automatically adopt parameters sent from the management
device.
There must be a unique management device in a cluster. Note the following items
when you create a cluster:
You are supposed to designate a management device first. It is the entrance and
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exit to access the cluster members, that is, a user on the external network can
access, configure, manage, and monitor the cluster members through it.
The management device recognizes and controls all members in its cluster, no
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matter where they are located on the network or how they are connected.
The management device collects topology information about all the member and
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candidate devices to provide useful information for a user when he establishes a
cluster.
The management device learns the network topology through NDP/NTDP
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information collection for device management and monitoring.
Before you perform other configuration tasks, the cluster function is supposed to be
enabled first.
You need to enable the cluster function and configure cluster parameters on a
management device. However, you only have to enable the cluster function on the
member devices and candidate devices.
You can also configure an FTP,TFTP,SNMP host and loghost server for a cluster on the
management device. In this case, the communications between a member device in
the cluster and an external server are carried out by the management device. For
clusters with no FTP/TFTP server configured, the management device operates as the
public FTP/TFTP server.
By specifying the NM interface of a management switch, you can enable an
administrator to log into the management switch of a cluster to manage the devices
in the cluster. Note that an administrator can only log into a management switch
through the NM interface.
The management VLAN interface is the default NM interface.
You can configure only one NM interface, and the new configured one will override
the original one.