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Using luci, one can explicitly set "netmask bits" [bug 618578].

It might be a good idea to reflect this "feature" also in documentation.
I suspect that the RA parameters are directly derived from their
metadata and as the respective one missed this too, I proposed a change
in the upstream [1,2].  Cluster Administration documentation can follow
it directly, unless another wording is suggested in a subsequent
discussion.

[1] https://github.com/ClusterLabs/resource-agents/pull/162
[2] https://github.com/jnpkrn/resource-agents/commit/5d45160dd28e53badbabd4e116718025825f3f21

> It might be a good idea to reflect this "feature" also in documentation.

I meant, to document "the feature" support on the lowest level:
IP resource agent and its "address" attribute.  This is what luci relies
upon when allowing user to set "netmask bits".

*** Bug 873078 has been marked as a duplicate of this bug. ***