How to change VIP in 11gR2 RAC

1. Find the existing configuration 

srvctl config nodeapps -a

[grid@sbldcdb01 ~]$ srvctl config nodeapps -a
Network exists: 1/172.31.36.0/255.255.255.128/eth0, type static
VIP exists: /sbldcdb01-vip/172.31.36.26/172.31.36.0/255.255.255.128/eth0, hosting node sbldcdb01
VIP exists: /sbldcdb02-vip/172.31.36.27/172.31.36.0/255.255.255.128/eth0, hosting node sbldcdb02
[grid@sbldcdb01 ~]$

2. Stop VIP Service 

srvctl stop vip -n sbldcdb01 -f

srvctl stop instance -d sblcbs -n sbldcdb01 (Optional)

[grid@sbldcdb01 ~]$ srvctl stop vip -n sbldcdb01
PRCR-1014 : Failed to stop resource ora.sbldcdb01.vip
PRCR-1065 : Failed to stop resource ora.sbldcdb01.vip
CRS-2529: Unable to act on 'ora.sbldcdb01.vip' because that would require stopping or relocating 'ora.LISTENER.lsnr', but the force option was not specified
[grid@sbldcdb01 ~]$

[grid@sbldcdb01 ~]$ srvctl stop vip -n sbldcdb01 -f
[grid@sbldcdb01 ~]$ srvctl stop instance -d sblcbs -n sbldcdb01

[IF problem found in above statement srvctl stop vip -n sbldcdb01 -f]

3. Modify the VIP

srvctl modify nodeapps -n sbldcdb01 -A 172.31.36.8/255.255.255.0/eth0

srvctl modify network -k 1 -S 110.11.70.0/255.255.255.0/eth2 [If want to change the network]

4. Changes into /etc/hosts


5. Verify the new VIP

/sbin/ifconfig -a | egrep '(eth0|Mask)'

[grid@sbldcdb01 ~]$ /sbin/ifconfig -a | egrep '(eth0|Mask)'
eth0      Link encap:Ethernet  HWaddr 00:50:56:9E:B5:3E
          inet addr:172.31.36.18  Bcast:172.31.36.127  Mask:255.255.255.128
eth0:1    Link encap:Ethernet  HWaddr 00:50:56:9E:B5:3E
          inet addr:172.31.36.24  Bcast:172.31.36.127  Mask:255.255.255.128
eth0:3    Link encap:Ethernet  HWaddr 00:50:56:9E:B5:3E
          inet addr:172.31.36.8  Bcast:172.31.36.127  Mask:255.255.255.128
          inet addr:172.31.36.162  Bcast:172.31.36.191  Mask:255.255.255.192
          inet addr:169.254.233.149  Bcast:169.254.255.255  Mask:255.255.0.0
          inet addr:127.0.0.1  Mask:255.0.0.0
[grid@sbldcdb01 ~]$

6. Start VIP

srvctl stop vip -n node1