[ovs-dev] [RFC PATCH v2 00/13] Add Network Service Header Support

[Jesse Gross]

On Wed, Jul 13, 2016 at 10:44 PM, Elzur, Uri <uri.elzur at intel.com> wrote:
> +1 on starting w MD Type = 1
>
> Not sure I understand the concern expressed with " implementations that don't implement TLVs will become deployed and  then when there is a use for them it's no longer possible." - why will it not be possible to add MD Type=2 later?

As I said, it's a classic problem with IP options. Classic enough that
people frequently content that TLVs are not usable at all because they
don't get implemented which then becomes a self fulfilling prophesy.

I think I've been extremely clear on this matter. I also think that
I've been extremely consistent - I think I've said the same thing on
every review of this patch series, so it should not exactly be a
surprise. However, the bottom line is I want to see a complete
implementation of the protocol and not a half measure that will catch
people by surprise or limit future usage. That seems 100% reasonable
to me.