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How to Configure Multiple Shared Ethernet Adapters (SEA)?

How to Configure Multiple Shared Ethernet Adapters (SEA)?

How to Configure Multiple Shared Ethernet Adapters (SEA)?

(OP)
Greetings!

We have an P8 with a VIOS server and a bunch of AIX7.2 LPars.
Physically this P8 has 8 ehternet ports, corresponding to ent0-ent7, I assume.
On HMC I created one virtual Ethernet adapter with Port Ethernet (VLAN) ID: 1, shown in VIOS as ent8, and then
$ mkvdev -sea ent0 -vadapter ent8 -default ent8 -defaultid 1
ent9 is Available
All AIX Lpars share this SEA and work fine!

Now I want to add a 2nd SEA for a dedicated backup network. what is the simplest way?
Here is what I did!
1. I plug in the backup network cable to P8's the 4th physical port, which, I assume, should correspond ent3 in VIOS server.
Is there anyway to confirm that or to check which physical port is cabled or link up?
2. On HMC I created the 2nd virtual Ethernet adapter with VLAN ID 2, which correspond to ent10 in VIOS Server.
3. I am confused with the syntax of
mkvdev -sea target_device -vadapter virtual_ethernet_adapters -default DefaultVirtualEthernetAdapter -defaultid SEADefaultPVID
My understanding is that DefaultVirtualEthernetAdapter is used to handle all untagged packets, which in my case should be ent8, corresponding to the first the first Virtual Ethernet Adapter I created in HMC.
However,
$ mkvdev -sea ent3 -vadapter ent10 -default ent8 -defaultid 2
The command's response was not recognized. This may or may not indicate a problem.
Command did not complete.
What went wrong?

Anyway, I just want to created another SEA for dedicated backup network. What is the right procedure?
Thanks for all suggestions and advice.

-Kang

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