H3C S3100V2-52TP, Руководство по настройке, Страница: 178 / 224

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Figure 57 Network diagram
As shown in Figure 57 , the switch configured with a public IP address and performing the management
function is the management switch, the other managed switches are member switches, and the switch
that does not belong to any cluster but can be added to a cluster is a candidate switch. The management
switch and the member switches form the cluster.
Figure 58 Role change in a cluster
As shown in Figure 58 , a switch in a cluster changes its role according to the following rules:
•
A candidate switch becomes a management switch when you create a cluster on it. A management
switch becomes a candidate switch only after the cluster is removed.
• A candidate switch becomes a member switch after being added to a cluster. A member switch
becomes a candidate switch after it is removed from the cluster.
How a cluster works
Cluster management is implemented through HW Group Management Protocol version 2 (HGMPv2),
which consists of the following three protocols:
•
Neighbor Discovery Protocol (NDP)
• Neighbor Topology Discovery Protocol (NTDP)
• Cluster
A cluster configures and manages the switches in it through the above three protocols. Cluster
management involves topology information collection and the establishment and maintenance of a
cluster. Topology information collection and cluster maintenance are independent from each other; in
fact, topology information collection starts before the cluster is created. The following workflow applies:
•
All switches use NDP to collect the information of directly connected neighbors, including their
software version, host name, MAC address and port number.
• The management switch uses NTDP to do the following:
{
Collect the information of the switches within user-specified hops.
{
Collect the topology information of all switches.