Clustering Handshake

    After a cluster is created, its member devices begin to send handshake packets first. The management device also sends handshake packets to the member 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 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 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.