Change 12cR1 Public IP/VIP/SCAN

Old IPs:
SCAN    10.100.10.235
        10.100.10.236
        10.100.10.237
      
Hosts:    10.100.10.231
        10.100.10.232
      
VIPs:    10.100.10.233
        10.100.10.234
      
New IPs:
SCAN    10.100.101.125
        10.100.101.126
        10.100.101.127
      
Hosts:    10.100.101.121
        10.100.101.122
      
VIPs:    10.100.101.123
        10.100.101.124
      
Step 1: As grid: (on first node only)
        oifcfg delif -global eth0/10.100.10.0
        oifcfg setif -global eth0/10.100.101.0:public
  
Step 2: As grid:
        [grid@psdb1 ~]$ srvctl config nodeapps -a :verify the current config
        Network 1 exists
        Subnet IPv4: 10.100.10.0/255.255.255.0/eth0, static
        Subnet IPv6:
        VIP exists: network number 1, hosting node psdb1
        VIP Name: psdb1-vip.lab.hsc.net.ou.edu
        VIP IPv4 Address: 10.100.10.233
        VIP IPv6 Address:
        VIP exists: network number 1, hosting node psdb2
        VIP Name: psdb2-vip.lab.hsc.net.ou.edu
        VIP IPv4 Address: 10.100.10.234
        VIP IPv6 Address:

        srvctl stop vip -n psdb1 -f
        srvctl relocate scan -scannumber 1 -node psdb2 (relocate scan to psdb2)
        srvctl relocate scan -scannumber 2 -node psdb2 (relocate scan to psdb2)
        srvctl relocate scan -scannumber 3 -node psdb2 (relocate scan to psdb2)
      
      
Step 3:    as root:
        vi /etc/sysconfig/network-scripts/ifcfg-eth0, change IP/GATEWAY
        Go to VM console:
        ifdown eth0
        ifup eth0
        Change NIC to the new VLAN
        ssh to the new IP
        change hostname/hostname-vip in DNS
        srvctl modify network -k 1 -S 10.100.101.0/255.255.255.0/eth0 (on first node only)
        srvctl modify nodeapps -n psdb1 -A psdb1-vip/255.255.255.0/eth0
        srvctl config nodeapps -a : verify changes
      
Step 4: as grid:
        srvctl start vip -n psdb1 (databases still up and servicing from psdb2)
                  
step 5: as root: (on first node)
        srvctl stop scan_listener
        srvctl stop scan
        srvctl status scan :verify scan is off
        srvctl status scan_listener: verify scan_listener is off
        change SCAN IPs in DNS
        srvctl config scan: shows old SCAN IPs
        srvctl modify scan -n psdb-scan
      
Step 6: Repeat Step 2 to Step 4 for the rest nodes in the cluster

Step 7: as root:
        srvctl start scan
        srvctl start scan_listener

step 8: Rolling bounce all databases