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World Wide Names
World Wide Names
The world wide name (WWN) in the switch is equivalent to the Ethernet MAC address. As with the MAC
address, you must uniquely associate the WWN to a single device. The principal switch selection and the
allocation of domain IDs rely on the WWN.
Cisco SAN switches support three network address authority (NAA) address formats. (see the following table).
Table 29: Standardized NAA WWN Formats
NAA Address
IEEE 48-bit
address
IEEE
extended
IEEE
registered
Changes to the world-wide names should be made by an administrator or individual who is completely
Caution
familiar with switch operations.
Verifying the WWN Configuration
Use the show wwn commands to display the status of the WWN configuration. This example shows how to
display the status of all WWNs:
switch# show wwn status
Type
----
1
2,5
This example shows how to display 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:
Block Allocation Status: FREE
This example shows how to display 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:
Cisco Nexus 5500 Series NX-OS SAN Switching Configuration Guide, Release 7.x
218
NAA Type
Type 1 = 0001b
Type 2 = 0010b
Type 5 = 0101b
Configured
Available
----------
--------------
64
48 ( 75%)
524288
442368 ( 84%)
WWN Format
000 0000 0000b
Locally assigned
IEEE company ID: 24 bits
Resvd.
Alarm State
------
-----------
16
NONE
73728
NONE
0 Available: 256
Advanced Fibre Channel Features
48-bit MAC address
48-bit MAC address
VSID: 36 bits
OL-30895-01
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