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Chapter 25
Advanced Features and Concepts
S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m .
Example 25-3 Displays the Status of All WWNs
switch# show wwn status
NKAU & NKCR WWN Blks: Configured:
Example 25-4 Displays Specified Block ID Information
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
Example 25-5 Displays the WWN for a Specific Switch
switch# show wwn switch
Switch WWN is 20:00:ac:16:5e:52:00:00
FC ID Allocation for HBAs
Fibre Channel standards require a unique FC ID to be allocated to an N port attached to a Fx port in any
switch. To conserve the number of FC IDs used, Cisco MDS 9000 Family switches use a special
allocation scheme.
Some HBAs do not discover targets that have FC IDs with the same domain and area. Prior to Cisco
SAN-OS Release 2.0(1b), the Cisco SAN-OS software maintained a list of tested company IDs which
do not exhibit this behavior. These HBAs were allocated with single FC IDs, and for others a full area
was allocated.
The FC ID allocation scheme available in Release 1.3 and earlier, allocates a full area to these HBAs.
This allocation isolates them to that area and are listed with their pWWN during a fabric login. The
allocated FC IDs are cached persistently and are still available in Cisco SAN-OS Release 2.0(1b) (see
the
As of Cisco SAN-OS Release 2.0(1b), to allow further scalability for switches with numerous ports, the
Cisco SAN-OS software maintains a list of HBAs exhibiting this behavior. Each HBA is identified by its
company ID (also know as Organizational Unit Identifier, or OUI) used in the pWWN during a fabric
log in. Hence 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. Irrespective of the kind (whole area or single) of FC ID allocated, the FC ID
entries remain persistent.
Default Company ID list
All switches in the Cisco MDS 9000 Family, that ship with the SAN-OS Software Release 2.0(1b) or
later, 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.
OL-6973-03, Cisco MDS SAN-OS Release 2.x
Type 1 WWNs: Configured:
Types 2 & 5 WWNs: Configured: 524288 Available: 450560 (85%) Resvd.: 73728
Alarm Status:
"FC ID Allocation for HBAs" section on page
64 Available:
1760 Available:
Type1:
NONE Types 2&5:
0 Available: 256
25-7).
Cisco MDS 9000 Family Configuration Guide
FC ID Allocation for HBAs
48 (75%) Resvd.: 16
1760 (100%)
NONE
25-7
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