06-17-2016
if you can bring your systems offline:
1. add VLAN 31 to the network switch ports.
2. configure a new virtual adapter for VLAN 31 on both of your VIOSes.
3. configure the virtual adapter into the existing SEA.
4. configure a new virtual adapter for VLAN 31 for all of your AIX LPARs.
5. check that it works (usually it is enough to get it up with ifconfig and look at traffic with tcpdump, even without an IP address).
6. on day X, when you have downtime, remove your old virtual adapters with VLAN 30 from the AIX LPARs and configure IP addresses on the new virtual adapters.
7. if everything works ok, remove virtual adapter with VLAN 30 from SEA and from all VIOSes.
8. remove VLAN 30 from the network switch ports.
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