Brocade Network Advisor SAN + IP User Manual v12.1.0 - Manual (Page 143)

76 Brocade Network Advisor SAN + IP User Manual
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VDX/VCS discovery
4
• When you discover any member in a VCS fabric through individual IP device discovery, that
member acts as the seed switch and discovers all other members in the VCS fabric. The
principal switch of the VCS fabric displays as a VCS fabric. The VCS fabric members display as
individual L2 (DCB) devices.
• When you discover multiple members in a VCS fabric through profile discovery, the principal
switch acts as the seed switch and discovers all other members (not included in profile
discovery) in the VCS fabric. The principal switch of the VCS fabric displays as a VCS fabric. The
VCS fabric members display as individual L2 (DCB) devices.
VCS fabric rediscovery
Rediscovery is the refreshing of the asset data for the selected product. Rediscovery of a
VCS-enabled device or VCS fabric uses the following behavior:
• If you select a fabric seed switch, rediscovery refreshes the fabric membership information.
• If you select a fabric member, rediscovery refreshes the fabric member’s asset data.
• If you select a missing fabric member, rediscovery results in the discovery of new fabric or
discovery of a standalone switch (dependent on what happened to the disconnected member).
You can also delete missing fabric members from discovery (refer to
“Deleting IP devices from
discovery” on page 131).
NOTE
If you do not have the All IP Products AOR in your user account, you cannot rediscover missing
fabric members.
Seed switch failover
The Management application uses the seed switch to discover other members in the VCS fabric.
When you discover devices through individual discovery, the seed switch is the first member you
discover in the VCS fabric. When you discover devices through profile discovery, the seed switch is
the principal switch in the VCS fabric.
• If VCS mode is disabled on the seed switch, the Management application triggers rediscovery
of the other members in the VCS fabric and selects another member to act as the seed switch.
• If the seed switch becomes unreachable, the Management application selects another
member of the VCS fabric to act as the seed switch.
• If the seed switch becomes unreachable from the Management application and looses
connectivity with the VCS fabric, the Management application selects another member of the
VCS fabric to act as the seed switch.
• If the seed switch looses connectivity with the VCS fabric but is still reachable from the
Management application, the VCS fabric splits into two fabrics. When this occurs, 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 two fabrics regain
connectivity, the Management application uses the original seed switch as the seed switch for
the merged VCS fabric.