HP Cisco MDS 9124 Cisco MDS 9000 Family Fabric Manager Configuration Guide, Re - Page 717

Chapter 37 Advanced Features and Concepts World Wide Names Send documentation comments to [email protected] 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). Table 37-1 Standardized NAA WWN Formats NAA Address IEEE 48-bit address IEEE extended IEEE registered NAA Type Type 1 = 0001b Type 2 = 0010b Type 5 = 0101b WWN Format 000 0000 0000b Locally assigned IEEE company ID: 24 bits 48-bit MAC address 48-bit MAC address VSID: 36 bits Caution Changes to the world-wide names should be made by an administrator or individual who is completely familiar with switch operations. This section includes the following topics: • Displaying WWN Information, page 37-6 OL-16184-01, Cisco MDS SAN-OS Release 3.x Cisco MDS 9000 Family CLI Configuration Guide 37-5