Cisco Nexus 5000 Series Switch Fabric Manager Software Configuration Guide, NX-OS 4.0 (OL-16598-01, June 2008)

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22-6
Nexus 5000 Series Switch Fabric Manager Software Configuration Guide
OL-16598-01
Chapter 22 Advanced Features and Concepts
FC ID Allocation for HBAs
Configuring a Secondary MAC Address
To allocate secondary MAC addresses using Device Manager, perform this task:
Step 1 Choose FC > Advanced > WWN Manager.
You see the list of allocated WWNs as shown in Figure 22-4.
Figure 22-4 Allocated World Wide Names in Device Manager
Step 2
Fill in the BaseMacAddress and MacAddressRange fields with the appropriate values.
Step 3 Click Apply to save these changes, or click Close to discard any unsaved changes.
FC ID Allocation for HBAs
Fibre Channel standards require a unique FC ID to be allocated to an N port attached to an F port in any
switch. To conserve the number of FC IDs used, Nexus 5000 Series switches use a special allocation
scheme.
Some HBAs do not discover targets that have FC IDs with the same domain and area. The switch
software maintains a list of tested company IDs that do not exhibit this behavior. These HBAs are
allocated with single FC IDs. If the HBA can discover targets within the same domain and area, a full
area is allocated.
To allow further scalability for switches with numerous ports, the switch software maintains a list of
HBAs that can discover targets within the same domain and area. Each HBA is identified by its company
ID (also known as Organizational Unique Identifier, or OUI) used in the pWWN during a fabric log in.
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. Regardless of the type (whole area or single) of FC ID allocated, the FC ID entries remain
persistent.
This section includes the following topics:
• Default Company ID List, page 22-7
• Verifying the Company ID Configuration, page 22-7