DETAILED STEPS
PurposeCommand or Action
Enters global configuration mode.configure terminal
Example:
switch# configure terminal
switch(config)#
Step 1
Configures the secondary MAC address. This
command cannot be undone.
wwn secondary-mac wwn-id range value
Example:
switch(config)# wwn secondary-mac
33:e8:00:05:30:00:16:df range 55
Step 2
EXAMPLES
This example shows how to configure the secondary MAC address:
switch(config)# wwn secondary-mac 00:99:55:77:55:55 range 64
This command CANNOT be undone.
Please enter the BASE MAC ADDRESS again: 00:99:55:77:55:55
Please enter the mac address RANGE again: 64
From now on WWN allocation would be based on new MACs. Are you sure? (yes/no) no
You entered: no. Secondary MAC NOT programmed
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, Cisco SAN 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.
Default Company ID List
All Cisco SAN switches contain a default list of company IDs that require area allocation. Using the company
ID reduces the number of configured persistent FC ID entries. You can configure or modify these entries
using the CLI.
Cisco Nexus 5000 Series NX-OS SAN Switching Configuration Guide, Release 5.2(1)N1(1)
226 OL-27583-01
Advanced Fibre Channel Features
FC ID Allocation for HBAs
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