Configuring the Switch
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3
Switch Clustering
Switch Clustering is a method of grouping switches together to enable centralized
management through a single unit. Switches that support clustering can be grouped
together regardless of physical location or switch type, as long as they are
connected to the same local network.
A switch cluster has a “Commander” unit that is used to manage all other “Member”
switches in the cluster. The management station can use both Telnet and the web
interface to communicate directly with the Commander throught its IP address, while
the Commander manages Member switches using cluster “internal” IP addresses.
There can be up to 36 Member switches in one cluster, and Cluster switches must
be in the same IP subnet.
Once a switch has been configured to be a cluster Commander, it automatically
discovers other cluster-enabled switches in the network. These “Candidate”
switches only become cluster Members when manually selected by the
administrator through the management station.
After the Commander and Members have been configured, any switch in the cluster
can be managed from the web agent by choosing the desired Member ID from the
Cluster drop down menu. From the Commander CLI prompt, use the “rcommand”
command (see page 4-331) to connect to the Member switch.
Figure 3-156 Cluster Member Choice
Cluster Configuration
To create a switch cluster, first be sure that clustering is enabled on the switch (the
default is enabled), then set the switch as a Cluster Commander. Set a Cluster IP
Pool that does not conflict with the network IP subnet. Cluster IP addresses are
assigned to switches when they become Members and are used for communication
between Member switches and the Commander.
Command Attributes
•
Cluster Status
– Enables or disables clustering on the switch. (Default: Enabled)
•
Cluster Commander
– Enables or disables the switch as a cluster Commander.
•
Role
– Indicates the current role of the switch in the cluster; either Commander,
Member, or Candidate.
•
Cluster IP Pool
– An “internal” IP address pool that is used to assign IP addresses
to Member switches in the cluster. Internal cluster IP addresses are in the form
10.
x.x.member-ID
. Only the base IP address of the pool needs to be set since
Member IDs can only be between 1 and 36. Note that y
ou cannot change the cluster
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