H3C S5100-SI Series Operation Manual page 547

Operation Manual – Stack-Cluster
H3C S5100-SI/EI Series Ethernet Switches
Receives the
handshake or
management
packets
Connect
Figure 2-3 State machine of the connection between the management device and a
member device
After a cluster is created and a candidate device is added to the cluster as a
member device, both the management device and the member device store the
state information of the member device and mark the member device as Active.
The management device and the member devices exchange handshake packets
periodically. Note that the handshake packets exchanged keep the states of the
member devices to be Active and are not responded.
If the management device does not receive a handshake packet from a member
device after a period three times of the interval to send handshake packets, it
changes the state of the member device from Active to Connect. Likewise, if a
member device fails to receive a handshake packet from the management device
after a period three times of the interval to send handshake packets, the state of
the member device will also be changed from Active to Connect.
If the management device receives a handshake packet or management packet
from a member device that is in Connect state within the information holdtime, it
changes the state of the member device to Active; otherwise, it changes the state
of the member device (in Connect state) to Disconnect, in which case the
management device considers the member device disconnected. Likewise, if this
member device, which is in Connect state, receives a handshake packet or
management packet from the management device within the information holdtime,
it changes its state to Active; otherwise, it changes its state to Disconnect.
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
Active
Fails to receive
handshake
packets in three
consecutive
intervals
State holdtime exceeds
the specified value
2-7
Chapter 2 Cluster
Disconnect state
is recovered
Disconnect