Brocade Network Advisor SAN + IP User Manual v12.3.0 - Manual (Page 137)

Brocade Network Advisor SAN + IP User Manual 67
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Logical chassis cluster mode discovery
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Logical chassis cluster mode discovery
Logical chassis cluster mode requires Network OS 4.0 or later and is one of two types of VCS
modes. In logical chassis cluster mode, both the data and configuration paths are distributed. The
entire cluster can be configured from the principal node. The other VCS mode is fabric cluster
mode, in which the data path for nodes is distributed, but the configuration path is not distributed
and each node keeps its configuration database independently. The generic term VCS mode
applies to both fabric cluster mode and logical chassis mode unless otherwise stated.
The State column of the Discover Setup - IP Dialog shown in Figure 13 is applicable only to nodes
that are members of a logical chassis cluster. The possible node states are described later in this
section.
FIGURE 13 Discovery Setup - IP dialog box with node state for logical chassis cluster
Logical chassis cluster discovery includes the following behavior:
• Manual- or profile-based discovery is the same as for a cluster in fabric cluster mode.
• Uses the IP address of any member of the logical chassis cluster for discovery.
• Sets the cluster IP address to the IP address of the principal node.
NOTE
You can change the principal node for the cluster by running the logical-chassis
principal-priority command from the NOS prompt. For more information, refer to the Network
OS Command Reference.
• Principal-switch failover does not occur if the cluster is unstable (for example, if the chassis
had been disabled for maintenance) because refresh collection will fail.
• If the cluster is configured with a virtual IP address before its discovery, and then discovery is
initiated, the cluster IP displays the virtual IP address instead of the IP address of the principal
node.
• If the cluster is configured with a virtual IP address after it is discovered by the Management
application, the virtual IP address is collected and saved in the database for the next lazy
polling or next adaptive collection.
• If another switch becomes the principal switch, the Management application sets the cluster IP
address to that of the new principal switch at the next lazy polling or next adaptive collection.