Interop Mode - HP storageworks 2/32 Installation Manual

If all switches are set to Principal or Default, the switch with the highest priority
and the lowest WWN becomes the principal switch. Following are some examples
of principal switch selection when switches have these settings:
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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:
considering setting this value to something other than default, refer to the section on
principal switch selection for multiswitch fabrics in the HP StorageWorks SAN Planning
Manual 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:
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Edge Switch 2/32 Installation Guide
If you have three switches and set all to Default, the switch with the lowest
WWN becomes the principal switch.
If you have three switches and set two to Principal and one to Default, the
switch with the Principal setting that has the lowest WWN becomes the
principal switch.
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.
We recommend you leave the switch priority setting as Default. If you are
Homogeneous Fabric—Select this mode if the fabric contains only HP
directors and switches that are operating in Homogeneous Fabric mode.
Open Fabric 1.0—Default. Select this mode if the fabric contains HP
directors and switches, as well as other open-fabric compliant switches. Select
this mode for managing heterogeneous fabrics.
Installing and Configuring the Edge Switch 2/32
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