IBM SAN32M1, Installation And Service Manual

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SAN32M1 Fabric Switch Installation and Service Manual 134
• If you have three switches and set two to Default and one to Never
Principal, the switch with the Default setting and the lowest WWN
becomes the principal switch.
Note that at least one switch in a multiswitch fabric needs to be set as
Principal or Default. If all of the switches are set to Never Principal, all
of the interswitch links (ISLs) will segment. If all but one switch is set
to Never Principal and the switch that was principal goes offline, then
all of the other ISLs will segment.
NOTE: We recommend you leave the switch priority setting as Default. If you
are considering setting this value to something other than default, refer to the
section on principal switch selection for multiswitch fabrics in the
IBM
Products in a SAN Environment Planning Manual, GC26-7675
for details.
In, for example, the audit log, you may notice that 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. The number
codes of 2 - 253 are not currently in use.
Interop mode
Select one of the following options:
• McDATA Fabric 1.0. Select this mode if the fabric contains only
IBM switches and switches that are operating in McDATA Fabric
1.0 mode.
• Open Fabric 1.0. Select this mode if the fabric contains IBM
directors and switches, as well as other open-fabric compliant
switches. Select this mode for managing heterogeneous fabrics.
This is the default mode.
Configure ports (open systems mode)
If the switch is set to open systems mode, perform this procedure to
define Fibre Channel port names, configure ports as blocked or
unblocked, enable extended distance operation and link incident
(LIN) alerts, configure port binding, and define port types.
To configure switch ports (Open Systems Management Style only):
1. At the Hardware View for the selected switch, click the Configure
icon at the navigation control panel and select Ports from the
Configure menu. The Configure Ports dialog box (open systems
mode) displays.