H3C Technologies H3C MSR 50 User Manual
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You should specify the management device before creating a cluster. The management device
discovers and defines a candidate device through NDP and NTDP protocols. The candidate
device can be automatically or manually added to the cluster.
After the candidate device is added to the cluster, it can obtain the member number assigned by
the management device and the private IP address used for cluster management.
2.
Communication within a cluster
In a cluster the management device communicates with its member devices by sending handshake
packets to maintain connection between them. The management/member device state change is
.
Figure 26 Management/member device state change
A cluster manages the state of its member devices as follows:
•
After a candidate device is added to the cluster and becomes a member device, the management
device saves its state information and identifies it as Active. The member device also saves its state
information and identifies itself as Active.
•
The management device and member devices send handshake packets. Upon receiving the
handshake packets, the management device or a member device keeps its state as Active without
sending a response.
•
If the management device does not receive handshake packets from a member device within a
period that is three times the handshake interval, it changes the status of the member device from
Active to Connect. Likewise, if a member device fails to receive handshake packets within a period
that is three times the handshake interval, its state changes from Active to Connect.
•
During the information holdtime, if the management device receives handshake or management
packets from a member device that is in Connect state, it changes the state of the member device
to Active. Otherwise, it considers the member device to be disconnected, and changes the state of
the member device to Disconnect.
•
During the information holdtime, a member device in Connect state changes its state to Active if it
receives handshake or management packets from the management device. Otherwise, it changes
its state to Disconnect.
•
When the communication between the management device and a member device is recovered, the
member device is added to the cluster and its state changes from Disconnect to Active on itself and
the management device.
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