Sasha,

On Wed, Oct 19, 2022 at 08:07:06PM +0000, Alexander Vainshtein wrote:
> And I have not encountered implementations by other vendors that support this 
> option (with or without the knob in question). My guess (FWIW) is that this 
> would make an implementation much more complicated while the benefits would 
> be minimal.

BFD on LAG was a contentious and fussy bit of RFC work.  Much of the earlier
headache about whether multicast or unicast MACs were to be involved had to
do with chip details.  However, I suspect as time has passed and it's become
a more common feature across the vendors, things may have stabilized.

> So I think that we indeed need a survey you have proposed.

I've internally enquired about this at Juniper.

A brief survey of some other implementations' manuals doesn't seem to
suggest any knob for this behavior.  It'd be good to get more formal
statement of compliance from these vendors.

> If there are no implementations exercising optional behavior, deprecating it 
> in 7130 could be considered as well.

Absolutely.  That would be an appropriate errata response once we have some
data.

-- Jeff

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