[rbridge] Tie breaking in trees

[Dinesh G Dutt]

Radia,

Radia Perlman wrote:
> a) most preferred are those established by P2P Hellos,
> with tie-breaking among those based on preferring the
> one with the numerically highest Estended Circuit ID.
>
> b) next considered are those established through TRILL-Hellos,
> with suppressed pseudonodes. Note that the pseudonode is
> suppressed in LSPs, but still appears in the TRILL-Hello,
> and therefore is available for this tie-breaking. Among these
> links, the one with the numerically largest pseudonode ID is preferred".
>   
I want this i.e. (a) followed by (b). The alternative that you suggest 
below for (a) will make IIC inordinately expensive to implement in 
hardware. The alteranate check will have to allow frames for not only 
the adjacent Rbridge but all other Rbridges that are upstream from 
multiple interfaces. I strongly disagree with the alternate text below,

Dinesh
> **********
> An alternative would be to replace a) with:
>
> a) most preferred are those established by P2P Hellos. If there
> are one or more of those, R1 is allowed to transmit on any of those,
> and R2 is required to accept from any of those.
>
>
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>   

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