Considerations for clients that mount NFS exports using a nonreserved port
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The -mount-rootonly option must be disabled on a storage system that must support clients that mount NFS exports using a nonreserved port even when the user is logged in as root. Such clients include Hummingbird clients and Solaris NFS/IPv6 clients.
If the -mount-rootonly option is enabled, ONTAP does not allow NFS clients that use nonreserved ports, meaning ports with numbers higher than 1,023, to mount NFS exports.