Brocade Network OS Administrator’s Guide v4.1.1 - Manual (Page 57)

Logical chassis cluster mode configuration
In logical chassis cluster mode, any operation that results in writing to the configuration database gets
automatically distributed. There are no exceptions.
Each node in the logical chassis cluster maintains an individual copy of the configuration to enable high
availability of the cluster. The following illustrates nodes in a logical chassis cluster. Each node has its
own databases, and the databases kept by each node are identical at all times.
FIGURE 11 Configuration database in a logical chassis cluster
Network OS switches contain both global and local configuration. In a logical chassis cluster, a single
global configuration exists across all cluster members, while each individual member has its own local
configuration. (Conversely, in fabric cluster mode, each cluster member can have its own unique global
configuration.)
Global configuration is required for cluster-wide operations, whereas local configuration is specific to the
operation of an individual node. For more information and examples of each type of configuration, refer
to
Examples of global and local configurations on page 81.
Fabric cluster mode
Fabric cluster mode is defined as a fabric in which the data path for nodes is distributed, but the
configuration path is not distributed. Each node keeps its configuration database independently.
By default, the following platforms boot up in fabric cluster mode and will attempt to form Inter-Switch
Links (ISLs):
• Brocade VDX 8770-4
• Brocade VDX 8770-8
Logical chassis cluster mode configuration
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