Ben and I talked this over offline and came to the following conclusion.

This could potentially be a disruptive change, but we do want to
encourage users to use active-backup instead of SLB in general.  For
now, we will update NEWS indicating that we intend to switch to
active-backup as a default.  In addition, we will warn users that this
change is coming when they fail to explicitly set a bond mode.  Once a
release or two have passed, we can make the change knowing that people
have been properly warned.

Ethan

On Thu, Dec 15, 2011 at 09:11, Ben Pfaff <b...@nicira.com> wrote:
> On Wed, Dec 14, 2011 at 06:21:13PM -0800, Ethan Jackson wrote:
>> Since SLB bonds are fairly risky (see vswitchd/INTERNALS), it seems
>> prudent to require users to explicitly configure them.  This patch
>> defaults to active-backup bonds when no other bond_mode is
>> explicitly specified.
>>
>> Signed-off-by: Ethan Jackson <et...@nicira.com>
>
> This is a rather disruptive change, in that it will cause performance
> regressions in users' working setups, and so I'm inclined to be
> against it.
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