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66-24
Cisco MDS 9000 Family Fabric Manager Configuration Guide
OL-17256-03, Cisco MDS NX-OS Release 4.x
Chapter 66 Troubleshooting Your Fabric
FC ID Allocation for HBAs
Figure 66-16 Setting Secondary MAC Addresses
Step 4 Enter the secondary MAC address in the Secondary Mac Base field.
Step 5 Enter the range for the secondary MAC address in the Secondary Mac Range field.
Step 6 Click the Apply Changes icon.
Displaying WWN Information
To display the status of the WWN configuration, follow these steps:
Step 1 Select a SAN (or a VSAN) from the Logical Domains pane.
You see a list of switches in the Information pane.
Step 2 Choose Switches > FC Services > WWN Manager from the Physical Attributes pane.
You see the WWN information for each switch in the SAN or VSAN.
FC ID Allocation for HBAs
Fibre Channel standards require a unique FC ID to be allocated to an N port attached to a Fx port in any
switch. To conserve the number of FC IDs used, Cisco MDS 9000 Family switches use a special
allocation scheme.
Some HBAs do not discover targets that have FC IDs with the same domain and area. Prior to Cisco
SAN-OS Release 2.0(1b), the Cisco SAN-OS software maintained a list of tested company IDs which
do not exhibit this behavior. These HBAs were allocated with single FC IDs, and for others a full area
was allocated.
The FC ID allocation scheme available in Release 1.3 and earlier, allocates a full area to these HBAs.
This allocation isolates them to that area and are listed with their pWWN during a fabric login. The
allocated FC IDs are cached persistently and are still available in Cisco SAN-OS Release 2.0(1b) and
later releases (see the
“FC ID Allocation for HBAs” section on page 66-24).
As of Cisco SAN-OS Release 2.0(1b) and Cisco NX-OS Release 4.1(1), to allow further scalability for
switches with numerous ports, the Cisco SAN-OS and NX-OS software maintains a list of HBAs
exhibiting this behavior. Each HBA is identified by its company ID (also know as Organizational Unit
Identifier, or OUI) used in the pWWN during a fabric log in. Hence a full area is allocated to the N ports
with company IDs that are listed and for the others, a single FC ID is allocated. Irrespective of the kind
(whole area or single) of FC ID allocated, the FC ID entries remain persistent.
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