Cluster Overview
323
n
On the management device, you need to enable the cluster function and
configure cluster parameters. On the member/candidate devices, however, you
only need to enable the cluster function so that they can be managed by the
management device.
Cluster maintenance
1
Adding a candidate device to a cluster
To create a cluster, you need to determine the device to operate as the
management device first. The management device discovers and determines
candidate devices through NDP and NTDP, and adds them to the cluster. You can
also add candidate devices to a cluster manually.
After a candidate device is added to a cluster, the management device assigns a
member number and a private IP address (used for cluster management) to it.
2
Communications within a cluster
In a cluster, the management device maintains the connections to the member
devices through handshake packets. Figure 101 illustrates the state machine of
the connection between the management device and a member device.
Figure 101
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
Receives the
handshake or
management
packets
Fails to receive
handshake
packets in three
consecutive
intervals
State holdtime exceeds
the specified value
Disconnect state
is recovered
Active
Connect
Disconnect
Summary of Contents for 4210 PWR
Page 22: ...20 CHAPTER 1 CLI CONFIGURATION...
Page 74: ...72 CHAPTER 3 CONFIGURATION FILE MANAGEMENT...
Page 84: ...82 CHAPTER 5 VLAN CONFIGURATION...
Page 96: ...94 CHAPTER 8 IP PERFORMANCE CONFIGURATION...
Page 108: ...106 CHAPTER 9 PORT BASIC CONFIGURATION...
Page 122: ...120 CHAPTER 11 PORT ISOLATION CONFIGURATION...
Page 140: ...138 CHAPTER 13 MAC ADDRESS TABLE MANAGEMENT...
Page 234: ...232 CHAPTER 17 802 1X CONFIGURATION...
Page 246: ...244 CHAPTER 20 AAA OVERVIEW...
Page 270: ...268 CHAPTER 21 AAA CONFIGURATION...
Page 292: ...290 CHAPTER 26 DHCP BOOTP CLIENT CONFIGURATION...
Page 318: ...316 CHAPTER 29 MIRRORING CONFIGURATION...
Page 340: ...338 CHAPTER 30 CLUSTER...
Page 362: ...360 CHAPTER 33 SNMP CONFIGURATION...
Page 368: ...366 CHAPTER 34 RMON CONFIGURATION...
Page 450: ...448 CHAPTER 39 TFTP CONFIGURATION...
Page 451: ......
Page 452: ...450 CHAPTER 39 TFTP CONFIGURATION...
Page 470: ...468 CHAPTER 40 INFORMATION CENTER...
Page 496: ...494 CHAPTER 44 DEVICE MANAGEMENT...