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Cisco MDS 9000 Family Fabric Manager Configuration Guide
OL-17256-03, Cisco MDS NX-OS Release 4.x
Chapter 37 Advanced Features and Concepts
Switch Interoperability
Default Company ID list
All switches in the Cisco MDS 9000 Family that ship with Cisco SAN-OS Release 2.0(1b) or later, or
NX-OS 4.1(1) 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.
Caution Persistent entries take precedence over company ID configuration. If the HBA fails to discover
a target, verify that the HBA and the target are connected to the same switch and have the same
area in their FC IDs, then perform the following procedure:
1. Shut down the port connected to the HBA.
2. Clear the persistent FC ID entry.
3. Get the company ID from the Port WWN.
4. Add the company ID to the list that requires area allocation.
5. Bring up the port.
The list of company IDs have the following characteristics:
• A persistent FC ID configuration always takes precedence over the list of company IDs. Even if the
company ID is configured to receive an area, the persistent FC ID configuration results in the
allocation of a single FC ID.
• New company IDs added to subsequent releases are automatically added to existing company IDs.
• The list of company IDs is saved as part of the running and saved configuration.
• The list of company IDs is used only when the fcinterop FC ID allocation scheme is in auto mode.
By default, the interop FC ID allocation is set to auto, unless changed.
Tip We recommend that you set the fcinterop FC ID allocation scheme to auto and use the company
ID list and persistent FC ID configuration to manipulate the FC ID device allocation.
Refer to the Cisco MDS 9000 Family CLI Configuration Guide to change the FC ID allocation.
Verifying the Company ID Configuration
To view the configured company IDs using Device Manager, choose FC > Advanced > FcId Area
Allocation. 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.
Some WWN formats do not support company IDs. In these cases, you may need to configure the FC ID
persistent entry.
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.
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