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Advanced Fibre Channel Features
• If the peer switch ELP uses the switch WWN, then the local switch also uses the switch WWN.
• If the peer switch ELP uses the VSAN WWN, then the local switch also uses the VSAN WWN.
Configuring a Secondary MAC Address
You can allocate secondary MAC addresses.
Procedure
Step 1
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.
OL-30895-01
Command or Action
configure terminal
Example:
switch# configure terminal
switch(config)#
wwn secondary-mac wwn-id range value
Example:
switch(config)# wwn secondary-mac
33:e8:00:05:30:00:16:df range 55
Cisco Nexus 5500 Series NX-OS SAN Switching Configuration Guide, Release 7.x
FC ID Allocation for HBAs
Purpose
Enters global configuration mode.
Configures the secondary MAC address.
This command cannot be undone.
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