ZFS 7320 Appliance management interfaces

Hello SunManagers,

there is a 7320 in clustered configuration.
igb0, igb1, igb2 of each Head are in LACP datalink.
igb3 on each Head supposed to be Admin interface.

Docs http://docs.oracle.com/cd/E22471_01/html/820-4167/configuration__cluster.html
-> Cluster -> Setup procedure
say that:
10. # Best practices include configuring and assigning a private
network interface for administration to each head, which will enable
administration via either head over the network (BUI or CLI)
regardless of the cluster state.

I have not found instructions on how to set up it's own IP on igb3 for
each Head.
Is there any?

My attempt was to make net/igb3 resource Private in Configuration ->
Cluster -> Resources. But I've had no luck with setting then igb3
separately on each Head.

What I need, it's to get the Support bundle from both Heads and to be
able to apply firmware upgrades on Heads.

Correct me please if I misunderstood the docs.