5
Configuring Operating Parameters
5-9
Configuring the Switch
Switch Priority Every multiswitch fabric contains one principal switch, which assumes
domain address manager functionality, and controls the allocation
and distribution of Domain IDs for all switches in the fabric
(including itself).
The Switch Priority settings for all switches in the fabric determine
the selection of the principal switch. Valid settings are:
◆ Principal
◆ Default
◆ Never Principal
EMC recommends leaving the setting for each director/switch at Default.
A principal switch is selected through negotiation during the Build
Fabric process that follows any of these occurrences:
◆ Multiple directors/switches are interconnected to form a fabric.
◆ A director/switch is removed from the fabric.
◆ A director/switch with Operating Mode set to Open Systems
and Interop Mode set to McDATA 1.0 is added to the fabric.
(Refer to Configuring the Operating Mode on page 5-4.)
◆ An ISL is removed.
The principal switch is determined as follows:
◆ If one (and only one) director/switch is set to Principal, it
becomes the principal switch. This switch remains the principal
switch as long as it is on line in the fabric, even if someone
changes another switch’s Switch Priority to Principal.
◆ If more than one director/switch is set to Principal, the
director/switch with the lowest WWN number among those set
to Principal becomes the principal switch.
The Switch Priority setting for every other switch/director
(including any others that were previously set to Principal)
automatically changes to Default.
In some two-tier fabrics (consisting of backbone and edge switches), EMC
recommends configuring all backbone switches as Principal, to provide
backup in the event of a failure. (This prevents an edge switch from
becoming principal.) For more information, consult your EMC
representative.
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