Brocade Network Advisor SAN + IP User Manual v12.1.0 - Manual (Page 144)

Brocade Network Advisor SAN + IP User Manual 77
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Logical chassis cluster mode discovery
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VCS fabric split and merge
• If the seed switch looses connectivity with the VCS fabric but is still reachable from the
Management application, the Management application selects another member of the
VCS fabric to act as the seed switch and manages the original seed switch as a separate
VCS fabric.
When the original seed switch rejoins the original VCS fabric, the Management application
uses the original seed switch as the seed switch for the merged VCS fabric.
• If a member (not the seed switch) looses connectivity with the VCS fabric but is still reachable
from the Management application, the VCS fabric splits into two fabrics. The Management
application treats the member that lost connectivity as a separate VCS fabric.
When the member rejoins the original VCS fabric, the Management application uses the
VCS fabric that was discovered first as the merged VCS fabric.
Network OS 2.0 device limitations
VDX devices running Network OS 2.0.0 cannot be discovered directly. However, if you discover a
VCS fabric (running Network OS 2.1.0 or later) that contains VDX devices (running Network OS
2.0.0), the Network OS 2.0.0 devices are included in discovery of the fabric and display on the
topology map. Network OS 2.0.0 devices have the following limitations:
• Display as unreachable members in the fabric.
• Assets (ports, LAGs, VLANs, and so on) are not collected.
• TRILL links between Network OS 2.1.0 devices and Network OS 2.0.0 devices do not display.
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 12 is applicable only to nodes
that are members of a logical chassis cluster. The possible node states are described later in this
section.
FIGURE 12 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.