ORACLE RAC EXTENDED IP subnet´s and documentation.

Hi Guru´s

I have a question with Oracle RAC extended.

Node1 and Node2 in datacenter 1 and node3 in datacenter 2. ---- 30K distance.

which of these distributions is valid network?

node1:
pub: 10.1.1.x
vip: 10.1.1.x
priv: 20.0.0.x

node2:
pub: 10.1.1.x
vip: 10.1.1.x
priv: 20.0.0.x

node3:
pub: 10.1.1.x
vip: 10.1.1.x
priv: 20.0.0.x

SCAN:
scan1: 10.1.1.X
scan2: 10.1.1.X
scan3: 10.1.1.X

OR

node1:
pub: 10.1.1.x
vip: 10.1.1.x
priv: 20.0.0.x

node2:
pub: 10.1.1.x
vip: 10.1.1.x
priv: 20.0.0.x

node3:
pub: 10.1.5.x
vip: 10.1.5.x
priv: 20.0.0.x

SCAN:
scan1: 10.1.1.X
scan2: 10.1.1.X
scan3: 10.1.5.X

OR

or that would be another recommendation?

You have a documentation oficial?