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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 .
Total company ids: 7
+ - Additional user configured company ids.
* - Explicitly deleted company ids from default list.
You can implicitly derive the default entries shipped with a specific release by combining the list of
Company IDs displayed without any identification with the list of deleted entries.
You can also view or obtain the company IDs in a specific WWN by issuing the show fcid-allocation
company-id-from-wwn command (see
IDs. In these cases, you many need to configure the FC ID persistent entry.
Example 25-7 Displays the Company ID for the Specified WWN
switch# show fcid-allocation company-id-from-wwn 20:00:00:05:30:00:21:60
Extracted Company ID: 0x000530
Switch Interoperability
Interoperability enables the products of multiple vendors to come into contact with each other. Fibre
Channel standards guide vendors towards common external Fibre Channel interfaces.
If all vendors followed the standards in the same manner, then interconnecting different products would
become a trivial exercise. However, not all vendors follow the standards in the same way thus resulting
in interoperability modes. This section briefly explains the basic concepts of these modes.
Each vendor has a regular mode and an equivalent interoperability mode, which specifically turns off
advanced or proprietary features and provides the product with a more aimiable standards compliant
implementation.
Table 25-2
are specific to switches in the Cisco MDS 9000 Family while in interop mode.
Table 25-2
Switch Feature
Domain IDs
Timers
F_S_TOV
OL-6973-03, Cisco MDS SAN-OS Release 2.x
<-------------------- Default entry
00:50:2E
00:50:8B
00:60:B0
00:A0:B8
00:E0:69
<------------------ User-added entry
00:30:AE +
00:32:23 +
<------------- Explicitly deleted entry (from the original default list)
00:E0:8B *
lists the changes in switch behavior when you enable interoperability mode. These changes
Changes in Switch Behavior When Interoperability Is Enabled
Changes if Interoperability Is Enabled
Some vendors cannot use the full range of 239 domains within a fabric.
Domain IDs are restricted to the range 97-127. This is to accommodate
McData's nominal restriction to this same range. They can either be set up
statically (the Cisco MDS switch accept only one domain ID, if it does not get
that domain ID it isolates itself from the fabric) or preferred. (If it does not get
its requested domain ID, it accepts any assigned domain ID.)
All Fibre Channel timers must be the same on all switches as these values are
exchanged by E ports when establishing an ISL. The timers are F_S_TOV,
D_S_TOV, E_D_TOV, and R_A_TOV.
Verify that the Fabric Stability Time Out Value timers match exactly.
Example
25-6). Some WWN formats do not support company
Cisco MDS 9000 Family Configuration Guide
Switch Interoperability
25-9
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