[rbridge] Adopt draft-eastlake-trill-rbridge-fine-labeling-02.txt as WG document

[David Allan I]

Hi Erik:

> Thanks for clarifying. I didn't understand one point:

>> 3) It actually has limited utility as it does not offer any improved 
>> broadcast containment beyond egress filtering as it is nested inside 
>> the rbridge header (assuming implementations can filter on a 
>> concatentated tag stack). So it adds no value in additional scoping 
>> for MDTs for flooding and ARP.

> If a network has a need to support say 6000 separate tenant networks across a common core of RBridges, with RFC 6325 that isn't possible since the inner  > header can only represent 4k VLANs.
> With this proposal we can support that.

> Are you concerned about some form of containment across the core? TRILL will send multi-destination frames on a tree that can optionally be pruned by 
> transit rbridges based on the C-tag and EX-tag and the inner DA. Thus optionally the transit bridges already look inside the inner frame to do more 
> efficient pruning.

I was concerned containment that and have discussed pruning with folks without fully appreciating ESADI myself, which I've now looked over. On that concern I stand corrected. My other concerns still stand

Thanks for pointing this out
Dave