3com 4210 PWR 9-Port 3CR17341-91-ME 用户手册
产品代码
3CR17341-91-ME
320
C
HAPTER
30: C
LUSTER
Figure 100 State machine of cluster role
■
A candidate device becomes a management device when you create a cluster
on it. Note that a cluster must have one (and only one) management device.
On becoming a management device, the device collects network topology
information and tries to discover and determine candidate devices, which can
then be added to the cluster through configurations.
on it. Note that a cluster must have one (and only one) management device.
On becoming a management device, the device collects network topology
information and tries to discover and determine candidate devices, which can
then be added to the cluster through configurations.
■
A candidate device becomes a member device after being added to a cluster.
■
A member device becomes a candidate device after it is removed from the
cluster.
cluster.
■
A management device becomes a candidate device only after the cluster is
removed.
removed.
n
After you create a cluster on a Switch 4210, the switch collects the network
topology information periodically and adds the candidate switches it finds to the
cluster. The interval for a management device to collect network topology
information is determined by the NTDP timer. If you do not want the candidate
switches to be added to a cluster automatically, you can set the topology
collection interval to 0 by using the ntdp timer command. In this case, the switch
does not collect network topology information periodically.
topology information periodically and adds the candidate switches it finds to the
cluster. The interval for a management device to collect network topology
information is determined by the NTDP timer. If you do not want the candidate
switches to be added to a cluster automatically, you can set the topology
collection interval to 0 by using the ntdp timer command. In this case, the switch
does not collect network topology information periodically.
How a Cluster Works
Switch Clusteringv2 consists of the following three protocols:
■
Neighbor discovery protocol (NDP)
■
Neighbor topology discovery protocol (NTDP)
■
Cluster
A cluster configures and manages the devices in it through the above three
protocols.
protocols.
Cluster management involves topology information collection and the
establishment/maintenance of a cluster. Topology information collection and
cluster establishment/maintenance are independent from each other. The former,
as described below, starts before a cluster is established.
establishment/maintenance of a cluster. Topology information collection and
cluster establishment/maintenance are independent from each other. The former,
as described below, starts before a cluster is established.
Candidate device
Member device
Management device
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