North American Network Operators Group

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Re: BCP for Private OUI / address assignments?

  • From: Deepak Jain
  • Date: Mon Nov 24 16:31:40 2008

Realistically, OUI space is pretty large for each L2 domain... Once it hits an L3 domain, you can repeat OUIs all you want... Pick some prefix set of bits that include "locally assigned" that is unique to your organization and you will operationally be fine. Or the last 8 bits of your host server's base MAC (hardware) address -- plenty of entropy there.

Even when two or 10 organizations merge, unless you are merging them into the same tributary L3 domain, its not a problem...

And if it is a problem for more than 1 or 2 virtual machines, I'm sure your organization is big enough to split that into another domain/vlan/what have you.

Yes, its a nice idea to have a BCP that works without conflicts, but
I don't see how this is legitimately going to affect anyone more than theoretically... unless someone's device is really bad at generating OUIs; all of this based on the cheap prevalence of L3 devices at the edge.