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37-5
Cisco MDS 9000 Family Fabric Manager Configuration Guide
OL-17256-03, Cisco MDS NX-OS Release 4.x
Chapter 37 Advanced Features and Concepts
World Wide Names
Step 3 Click Apply to save these changes.
Step 4 Select commit from the CFS drop-down menu to distribute these changes or select abort from the CFS
drop-down menu to discard any unsaved changes.
When you commit the fctimer configuration changes, the effective database is overwritten by the
configuration changes in the pending database and all the switches in the fabric receive the same
configuration. When you commit the fctimer configuration changes without implementing the session
feature, the fctimer configurations are distributed to all the switches in the physical fabric.
Database Merge Guidelines
See the “CFS Merge Support” section on page 13-9 for detailed concepts.
When merging two fabrics, follow these guidelines:
• Be aware of the following merge conditions:
–
The merge protocol is not implemented for distribution of the fctimer values—you must
manually merge the fctimer values when a fabric is merged.The per-VSAN fctimer
configuration is distributed in the physical fabric.
–
The fctimer configuration is only applied to those switches containing the VSAN with a
modified fctimer value.
–
The global fctimer values are not distributed.
• Do not configure global timer values when distribution is enabled.
Note The number of pending fctimer configuration operations cannot be more than 15. At that point, you must
commit or abort the pending configurations before performing any more operations.
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. The WWN manager, a process-level manager residing
on the switch’s supervisor module, assigns WWNs to each switch.
Cisco MDS 9000 Family switches support three network address authority (NAA) address formats (see
Table 37-1).
Ta b l e 37-1 Standardized NAA WWN Formats
NAA Address NAA Type WWN Format
IEEE 48-bit address Type 1 = 0001b 000 0000 0000b 48-bit MAC address
IEEE extended Type 2 = 0010b Locally assigned 48-bit MAC address
IEEE registered Type 5 = 0101b IEEE company ID: 24 bits VSID: 36 bits
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