3Com Switch 4800G 24-Port Configuration Manual page 910

910 C 73: C
HAPTER LUSTER
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ANAGEMENT ONFIGURATION
devices at the same interval. Upon receiving the handshake packets from the
other side, the management device or member device simply changes or
remains its state as Active, without sending a response.
If the management device does not receive the handshake packets from a
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member device in an interval three times of the interval to send handshake
packets, it changes the status of the member device from Active to Connect.
Likewise, if a member device fails to receive the handshake packets from the
management device in an interval three times of the interval to send
handshake packets, the status of the member device will also be changed from
Active to Connect.
If this management device, in information holdtime, receives the handshake or
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management packets from its member device which is in Connect state, it
changes the state of its member device to Active; otherwise, it changes the
state of its member device to Disconnect, in which case the management
device considers its member device disconnected. If this member device, which
is in Connect state, receives handshake or management packets from the
management device in information holdtime, it changes its state to Active;
otherwise, it changes its state to Disconnect.
If the communication between the management device and a member device
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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, the member device informs the management device using handshake
packets when there is a neighbor topology change.
Management VLAN
The management VLAN limits the cluster management range. Through
configuration of the management VLAN, the following functions can be
implemented:
Management packets (including NDP, NTDP and handshake packets) are
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restricted within the management VLAN, therefore isolated from other packets,
which enhances security.
The management device and the member devices communicate with each
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other through the management VLAN.
For a cluster to work normally, you must set the packets from the management
VLAN to pass the subtending ports (If a candidate device is connected to the
management device through another candidate device, the ports connecting
these two candidate devices are called subtending ports.) and the ports
connecting the management device and the member/candidate devices.
Therefore:
If the packets from the management VLAN cannot pass a port, the device
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connected with the port cannot be added to the cluster. Therefore, if the ports
(including the subtending 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.
Only when the default VLAN ID of the subtending ports and the ports
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connecting the management device and the member/candidate devices is that