2-8
z If the connection between the management device and a member device in
Disconnect state is recovered, the member device will be added to the cluster
again. After that, the state of the member device will turn to Active both locally and
on the management device.
Besides, handshake packets are also used by member devices to inform the
management device of topology changes.
Additionally, on the management device, you can configure the FTP server, TFTP
server, logging host and SNMP host to be shared by the whole cluster. When a member
device in the cluster communicates with an external server, the member device first
transmits data to the management device, which then forwards the data to the external
server. The management device serves as the default shared FTP server when no
shared FTP server is configured for the cluster.
V. Management VLAN
Management VLAN limits the range of cluster management. Through management
VLAN configuration, the following functions can be implemented:
z Enabling the management packets (including NDP packets, NTDP packets, and
handshake packets) to be transmitted in the management VLAN only, through
which the management packets are isolated from other packets and network
security is improved.
z Enabling the management device and the member devices to communicate with
each other in the management VLAN.
Cluster management requires the packets of the management VLAN be permitted on
ports connecting the management device and the member/candidate devices.
Therefore:
z If the packets of management VLAN are not permitted on a candidate device port
connecting to the management device, the candidate device cannot be added to
the cluster. In this case, you can enable the packets of the management VLAN to
be permitted on the port through the management VLAN auto-negotiation
function.
z Packets of the management VLAN can be exchanged between the management
device and a member device/candidate device without carrying VLAN tags only
when the default VLAN ID of both the two ports connecting the management
device and the member/candidate device is the management VLAN. If the VLAN
IDs of the both sides are not that of the management VLAN, packets of the
management VLAN need to be tagged.
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