[rbridge] Updating input fliters before output filters after atoplogy change

[Radia Perlman]

Right. With my wording, it would have precluded doing them 
simultaneously, and simultaneous would
be even better, and we clearly don't want to preclude that. So thanks 
for that wording.

Radia

Caitlin Bestler wrote:
> Radia wrote:
>   
>> So I think it's a good idea to say in the spec that the input filters
>> MUST be updated before the output filters.
>>
>>     
>
> To be strictly minimalistic "the input filters MUST NOT be updated
> after the output filters". That allows an implementation to use a
> single critical write to enable both updates.
>
>
>