HP StorageWorks 2/140 FW 07.00.00/HAFM SW 08.06.00 McDATA Products in a SAN En - Page 111
Fabric WWN assignment, Domain_ID assignment, A Domain_ID
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Planning Considerations for Fibre Channel Topologies 3 In the audit log, note the Principal setting maps to a number code of 1, Default maps to a number code of 254, and Never Principal maps to a number code of 255. Number codes 2 through 253 are not used. • Fabric WWN assignment - The Fabric Manager application identifies fabrics using a fabric WWN. The fabric WWN is the same as the WWN of the fabric's principal switch. If a new principal switch is selected because of a change to the fabric topology, the fabric WWN changes to the WWN of the newly selected principal switch. • Domain_ID assignment - Each director or switch in a multiswitch fabric is identified by a unique Domain_ID that ranges between 1 and 31. A Domain_ID of 0 is invalid. Numerical Domain_IDs specified by a user are converted to hexadecimal format and used in 24-bit Fibre Channel addresses that uniquely identify source and destination ports in a fabric. Each fabric element is configured through the Element Manager application with a preferred Domain_ID. When a director or switch powers on and comes online, it requests a Domain_ID from the fabric's principal switch (indicating its preferred value as part of the request). If the requested Domain_ID is not allocated to the fabric, the Domain_ID is assigned to the requesting director or switch. If the requested Domain_ID is already allocated, an unused Domain_ID is assigned. If two operational fabrics join, they determine if any Domain_ID conflicts exist between the fabrics. If one or more conflicts exist, the interconnecting ISL E_Ports segment to prevent the fabrics from joining. To prevent this problem, it is recommended that all directors and switches be assigned a unique preferred Domain_ID. This is important if zoning is implemented through port number (and by default Domain_ID) rather that WWN. When assigning preferred Domain_IDs in an open fabric with directors and switches supplied by multiple OEMs, be aware of the following: - For Intrepid 6000-series directors and Sphereon-series fabric switches, the firmware adds a base offset of 96 (hexadecimal 60) to the numerically-assigned preferred Domain_ID. Therefore, if a user assigns a director or switch a numerical preferred Domain_ID of 1, the firmware assigns a hexadecimal Domain_ID of 61. Planning Considerations for Fibre Channel Topologies 3-25
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