H3C Technologies H3C S5120 Series Switches - Manual (Page 677)

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information holdtime, it changes its state to Active; otherwise, it changes its state to Disconnect.
z If the communication between the management device and a member device is recovered, the
member device which is in Disconnect state will be added to the cluster. After that, the state of the
member device locally and on the management device will be changed to Active.
Besides, a member device informs the management device using handshake packets when there is a
neighbor topology change.
Management VLAN
The management VLAN is a VLAN used for communication in a cluster; it limits the cluster
management range. Through configuration of the management VLAN, the following functions can be
implemented:
z Management packets (including NDP, NTDP and handshake packets) are restricted within the
management VLAN, therefore isolated from other packets, which enhances security.
z The management device and the member devices communicate with each other through the
management VLAN.
For a cluster to work normally, you must set the packets from the management VLAN to pass the ports
connecting the management device and the member/candidate devices (including the cascade ports).
Therefore:
z If the packets from the management VLAN cannot pass a port, the device connected with the port
cannot be added to the cluster. Therefore, if the ports (including the cascade ports) connecting the
management device and the member/candidate devices prohibit the packets from the
management VLAN, you can set the packets from the management VLAN to pass the ports on
candidate devices with the management VLAN auto-negotiation function.
z Only when the default VLAN ID of the cascade ports and the ports connecting the management
device and the member/candidate devices is that of the management VLAN can you set the
packets without tags from the management VLAN to pass the ports; otherwise, only the packets
with tags from the management VLAN can pass the ports.
z If a candidate device is connected to a management device through another candidate device, the
ports between the two candidate devices are cascade ports.
z For information about VLAN, refer to VLAN Configuration.
Cluster Configuration Task List
Before configuring a cluster, you need to determine the roles and functions the devices play. You also
need to configure the related functions, preparing for the communication between devices within the
cluster.
Complete these tasks to configure a cluster:
Task Remarks
Configuring the Enabling NDP Globally and for Specific Ports Optional