[Bug 207056] Changing the MAC address on the lagg interface doesn't get retained after lagg port delete operation.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207056

            Bug ID: 207056
           Summary: Changing the MAC address on the lagg interface doesn't
                    get retained after lagg port delete operation.
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: gopu.0206 at gmail.com

Changing the MAC address on the lagg interface does not get retained after lagg
port delete operation.

How to reproduce:

-> Create a lagg interface

-> Add 2 ports to a lagg interface

-> Set the NEW MAC address on the lagg interface, which in-turn change the MAC
of the 2 physical ports.

-> Remove a lagg port from the lagg interface. (It should be the first
interface of LAGG / Master port)

Buggy part:

-> The NEWLY ADDED MAC address will be lost, the lagg interface will have the
other members physical interface MAC interface.


Fix Proposal:

-> At first place, why the MAC change is allowed on the lagg interface.

-> If allowed then the MAC shall be the generic MAC, that shall not be affinity
to a phyiscal port. Hence add / delete port operations on the lagg interface
should not affect the lagg interface MAC address (Unless all the ports were
deleted).

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