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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
Planning Considerations for Fibre Channel Topologies
3
3-25
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