Quite simply, the WWPN is used to create a predictable path to the boot LUN. Quite often you'll have multiple boot policies - one going to a pair (or more) of WWPNs and another going to the opposite WWPNs - to avoid stressing the SAN target. I rarely advise using the WWNN for zoning in just about any use case (including boot) because you no longer have a deterministic path to the target across all available target ports.
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