Cisco Nexus 5000 Series Switch CLI Software Configuration Guide (OL-16597-01, July 2009)
Verifying WWN Information
Use the show wwn commands to display the status of the WWN configuration. The following example displays
the status of all WWNs:
switch# show wwn status
Type Configured Available Resvd. Alarm State
---- ---------- -------------- ------ -----------
1 64 48 ( 75%) 16 NONE
2,5 524288 442368 ( 84%) 73728 NONE
The following example displays the information for block ID 51:
switch# show wwn status block-id 51
WWNs in this block: 21:00:ac:16:5e:52:00:03 to 21:ff:ac:16:5e:52:00:03
Num. of WWNs:: Configured: 256 Allocated: 0 Available: 256
Block Allocation Status: FREE
The following example displays the WWN for a specific switch:
switch# show wwn switch
Switch WWN is 20:00:ac:16:5e:52:00:00
Link Initialization WWN Usage
Exchange Link Protocol (ELP) and Exchange Fabric Protocol (EFP) use WWNs during link initialization.
ELPs and EFPs both use the VSAN WWN by default during link initialization. However, the ELP usage
changes based on the peer switch’s usage:
• 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
To allocate secondary MAC addresses, perform this task:
Procedure
PurposeCommand or Action
Enters configuration mode.switch# configuration terminal
Step 1
Configures the secondary MAC address. This
command cannot be undone.
switch(config)# wwn secondary-mac wwn-id
range value
Step 2
The following 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 Nexus 5000 Series switches use a special allocation
scheme.
Cisco Nexus 5000 Series Switch CLI Software Configuration Guide
612 OL-16597-01
Advanced Fibre Channel Features and Concepts
Verifying WWN Information